<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I’ve uploaded the first set of patches for this.  They should fix LTO for fused multiply-and-add.  -ffp-contract=fast is now translated into a new FMF called contract. <div class=""><br class=""></div><div class=""><ol class="">
<li style="margin: 0px; font-size: 12px; line-height: normal; font-family: 'Helvetica Neue'; color: rgb(69, 69, 69);" class="">llvm: [IR] Add AllowContract to FastMathFlags <a href="https://reviews.llvm.org/D31164" class=""><span style="color: #e4af0a" class="">https://reviews.llvm.org/D31164</span></a></li>
<li style="margin: 0px; font-size: 12px; line-height: normal; font-family: 'Helvetica Neue'; color: rgb(69, 69, 69);" class="">llvm: [SDAG] Add AllowContract to SNodeFlags <a href="https://reviews.llvm.org/D31165" class=""><span style="color: #e4af0a" class="">https://reviews.llvm.org/D31165</span></a></li>
<li style="margin: 0px; font-size: 12px; line-height: normal; font-family: 'Helvetica Neue'; color: rgb(69, 69, 69);" class="">clang: Encapsulate FPOptions and use it consistently <a href="https://reviews.llvm.org/D31166" class=""><span style="color: #e4af0a" class="">https://reviews.llvm.org/D31166</span></a></li>
<li style="margin: 0px; font-size: 12px; line-height: normal; font-family: 'Helvetica Neue'; color: rgb(69, 69, 69);" class="">clang: Use FPContractModeKind universally <a href="https://reviews.llvm.org/D31167" class=""><span style="color: #e4af0a" class="">https://reviews.llvm.org/D31167</span></a></li>
<li style="margin: 0px; font-size: 12px; line-height: normal; font-family: 'Helvetica Neue'; color: rgb(69, 69, 69);" class="">clang: Set FMF on -ffp-contract=fast rather than <a href="https://reviews.llvm.org/D31168" class=""><span style="color: #e4af0a" class="">https://reviews.llvm.org/D31168</span></a></li>
<li style="margin: 0px; font-size: 12px; line-height: normal; font-family: 'Helvetica Neue'; color: rgb(69, 69, 69);" class="">llvm: [DAGCombiner] Initial support for the fast-math flag contract <a href="https://reviews.llvm.org/D31169" class=""><span style="color: #e4af0a" class="">https://reviews.llvm.org/D31169</span></a></li>
</ol><div class="">DAGCombine support for fused subtract and then the pragma we discussed is coming up later.  Please help to review what I have so far.</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Adam</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Mar 16, 2017, at 5:20 PM, Hal Finkel <<a href="mailto:hfinkel@anl.gov" class="">hfinkel@anl.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
  
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    <div class="moz-cite-prefix">On 03/16/2017 06:23 PM, Adam Nemet
      wrote:<br class="">
    </div>
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          <div class="">On Mar 16, 2017, at 4:04 PM, Adam Nemet via
            cfe-dev <<a moz-do-not-send="true" href="mailto:cfe-dev@lists.llvm.org" class="">cfe-dev@lists.llvm.org</a>>
            wrote:</div>
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              <blockquote type="cite" class="">
                <div class=""><br class="Apple-interchange-newline">
                  On Mar 16, 2017, at 3:25 PM, Hal Finkel <<a moz-do-not-send="true" href="mailto:hfinkel@anl.gov" class="">hfinkel@anl.gov</a>> wrote:</div>
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                    </p>
                    <div class="moz-cite-prefix">On 03/16/2017 04:13 PM,
                      Adam Nemet wrote:<br class="">
                    </div>
                    <blockquote cite="mid:2A017F54-ED5D-4B62-A774-CCCED49E2206@apple.com" type="cite" class=""><br class="">
                      <div class="">
                        <blockquote type="cite" class="">
                          <div class="">On Mar 15, 2017, at 2:51 PM,
                            Adam Nemet <<a moz-do-not-send="true" href="mailto:anemet@apple.com" class="">anemet@apple.com</a>>
                            wrote:</div>
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                                On Mar 15, 2017, at 2:30 PM, Hal Finkel
                                <<a moz-do-not-send="true" href="mailto:hfinkel@anl.gov" class="">hfinkel@anl.gov</a>>
                                wrote:</div>
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                              <div class="">
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                                  </p>
                                  <div class="moz-cite-prefix">On
                                    03/15/2017 04:05 PM, Adam Nemet
                                    wrote:<br class="">
                                  </div>
                                  <blockquote cite="mid:C5B19D31-4651-4840-B9AC-C4F6FD1BD04D@apple.com" type="cite" class=""><br class="">
                                    <div class="">
                                      <blockquote type="cite" class="">
                                        <div class="">On Mar 15, 2017,
                                          at 2:00 PM, Hal Finkel <<a moz-do-not-send="true" href="mailto:hfinkel@anl.gov" class="">hfinkel@anl.gov</a>>
                                          wrote:</div>
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                                        <div class="">
                                          <div bgcolor="#FFFFFF" text="#000000" class=""><p class=""><br class="">
                                            </p>
                                            <div class="moz-cite-prefix">On
                                              03/15/2017 01:47 PM, Adam
                                              Nemet wrote:<br class="">
                                            </div>
                                            <blockquote cite="mid:E74F3BD7-4CF9-4CF7-8657-BC4776A71D03@apple.com" type="cite" class=""><br class="">
                                              <div class="">
                                                <blockquote type="cite" class="">
                                                  <div class="">On Mar
                                                    15, 2017, at 11:36
                                                    AM, Mehdi Amini <<a moz-do-not-send="true" href="mailto:mehdi.amini@apple.com" class="">mehdi.amini@apple.com</a>>
                                                    wrote:</div>
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                                                          <div class="">On
                                                          Mar 15, 2017,
                                                          at 10:13 AM,
                                                          Hal Finkel via
                                                          cfe-dev <<a moz-do-not-send="true" href="mailto:cfe-dev@lists.llvm.org" class="">cfe-dev@lists.llvm.org</a>>
                                                          wrote:</div>
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                                                          <div class="moz-cite-prefix" style="font-family: Helvetica; font-size: 12px; font-style: normal;
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                                                          On 03/15/2017
                                                          12:10 PM, Adam
                                                          Nemet via
                                                          llvm-dev
                                                          wrote:<br class="">
                                                          </div>
                                                          <blockquote cite="mid:FAB9D19D-F8F0-4364-BE54-5203FFB1295E@apple.com" type="cite" class="" style="font-family:
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                                                          rgb(255, 255,
                                                          255);">Relevant
                                                          to this
                                                          discussion is <a moz-do-not-send="true" href="http://bugs.llvm.org/show_bug.cgi?id=25721" class="">http://bugs.llvm.org/show_bug.cgi?id=25721</a> (-ffp-contract=fast
                                                          does not work
                                                          with LTO).  I
                                                          am working on
                                                          adding
                                                          function
                                                          attributes for
fp-contract=fast which should fix this.</blockquote>
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                                                          <span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal;
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                                                          !important;">Great!</span><br class="" style="font-family:
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                                                        <div class=""><br class="">
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                                                        <div class="">A
                                                          function
                                                          attribute
                                                          would be a
                                                          strict
                                                          improvement
                                                          over today:
                                                          LLVM can’t do
                                                          contraction
                                                          today. But
                                                          actually I’m
                                                          not sure if it
                                                          is the long
                                                          term right
                                                          choice:
                                                          attributes
                                                          don’t combine
                                                          well with
                                                          inlining for
                                                          instance. You
                                                          mentioned FMF
                                                          earlier, why
                                                          don’t we have
                                                          a FMF to allow
                                                          contraction?</div>
                                                      </div>
                                                    </div>
                                                  </div>
                                                </blockquote>
                                                <div class=""><br class="">
                                                </div>
                                                <div class="">OK, I
                                                  thought that the
                                                  prerequisite for that
                                                  was a fast-math pragma
                                                  which I don’t think is
                                                  something we have (I
                                                  want to be able to
                                                  specify contract=fast
                                                  on smaller granularity
                                                  than module).  But now
                                                  that I think more
                                                  about, we should be
                                                  able to turn a user
                                                  function attribute
                                                  into FMF in the
                                                  front-end which is the
                                                  most flexible.<span class="Apple-converted-space"> </span><br class="">
                                                </div>
                                              </div>
                                            </blockquote>
                                            <br class="">
                                            I agree, a FMF is the way to
                                            go and we can then control
                                            it with the pragma. We can
                                            use the STDC FP_CONTRACT
                                            pragma for contraction;</div>
                                        </div>
                                      </blockquote>
                                      <div class=""><br class="">
                                      </div>
                                      <div class="">Just to confirm, do
                                        you mean to introduce a “fast”
                                        option to the pragma, e.g.:</div>
                                      <div class=""><br class="">
                                      </div>
                                      <div class="">#pragma STDC
                                        FP_CONTRACT FAST</div>
                                    </div>
                                  </blockquote>
                                  <br class="">
                                  That's a good point. If we don't add
                                  something like this, then we'd be able
                                  to turn the fast mode off with the
                                  pragma, but then not be able to turn
                                  it back on ;)<br class="">
                                  <br class="">
                                  So, yes, except that I'm somewhat
                                  hesitant to invade the 'STDC' space
                                  with vendor extensions. If we
                                  generally introduce a pragma to
                                  control FMFs, maybe we should just use
                                  that instead? I don't have a clear
                                  idea on the syntax, but for example,
                                  if we had some pragma that let us do<br class="">
                                  <br class="">
                                  #pragma clang fast_math or #pragma
                                  clang fast_math nnan(off) contract(on)
                                  or whatever then we could use that.
                                  What do you think?<br class="">
                                </div>
                              </div>
                            </blockquote>
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                            </div>
                            <div class="" style="font-family: Helvetica;
                              font-size: 12px; font-style: normal;
                              font-variant-caps: normal; font-weight:
                              normal; letter-spacing: normal; orphans:
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                              text-transform: none; white-space: normal;
                              widows: auto; word-spacing: 0px;
                              -webkit-text-stroke-width: 0px;">That
                              looks great; it nicely matches the
                              internal representation.  Let me take a
                              stab at this.</div>
                          </div>
                        </blockquote>
                        <div class=""><br class="">
                        </div>
                        <div class="">Thinking more about this, I am
                          back to thinking that a function attribute is
                          the better solution for this than FMF, at
                          least before inlining.</div>
                        <div class=""><br class="">
                        </div>
                        <div class="">Consider the standard example
                          where we want this to trigger: an overloaded
                          addition and multiplier operator for a vector
                          class.</div>
                        <div class=""><br class="">
                        </div>
                        <div class="">In this case, we want the fadd and
                          the fmul in the inlined functions to have the
                          FMF as well but we don’t necessarily want to
                          mark the overloaded operators with the pragma;
                          we may be only comfortable contracting at this
                          call site.</div>
                        <div class=""><br class="">
                        </div>
                        <div class="">You don’t have this problem if you
                          mark the containing function FP-contractable.
                           Effectively what we want is to outline the
                          block within the pragma into a function and
                          tag it with the attribute.</div>
                        <div class=""><br class="">
                        </div>
                        <div class="">During inlining we can still
                          transform the function attribute into FMF.</div>
                        <div class=""><br class="">
                        </div>
                        <div class="">So I think I am going back to
                          implementing fp-contract=fast as a function
                          attribute as the first step unless there are
                          any objections.</div>
                      </div>
                    </blockquote>
                    <br class="">
                    Are you saying this works because we don't block
                    inlining when functions attributes don't match or
                    update the function attributes to be more
                    conservative when inlining? This is specifically one
                    of the issues we were avoiding by using FMFs.
                    Frankly, the same issue comes up with other
                    fast-math properties, and I don't see why we should
                    handle this differently. I think that I'd prefer you
                    stick with the new flag.<br class="">
                  </div>
                </div>
              </blockquote>
              <div class=""><br class="">
              </div>
              <div class="">OK, so in the example:</div>
              <div class=""><br class="">
              </div>
              <div class="">#pragma clang fast_math contract_fast(on)</div>
              <div class=""> vect v1 = v2 * v3 + v4;</div>
              <div class="">#pragma clang fast_math contract_fast(off)</div>
              <div class=""><br class="">
              </div>
              <div class="">where all the operands are vectors with the
                typical implementation for the overload operators, we
                wouldn’t fp-contract unless the operator definitions use
                contract_fast too?</div>
            </div>
          </div>
        </blockquote>
        <div class=""><br class="">
        </div>
        <div class="">I guess it’s the conservative thing to do since those
          functions may have non-contractable operations.</div>
      </div>
    </blockquote>
    <br class="">
    Exactly; the problem is that this is the desirable behavior in some
    circumstances and undesirable in others, but I think that doing the
    conservative thing is the most self-consistent choice (and also
    allows users the most powerful fine-grained control).<br class="">
    <br class="">
    Thanks again,<br class="">
    Hal<br class="">
    <br class="">
    <blockquote cite="mid:FD4A0C01-E39A-463B-B7B4-F17AEAEB1C43@apple.com" type="cite" class="">
      <div class="">
        <div class=""><br class="">
        </div>
        <div class="">Adam</div>
        <br class="">
        <blockquote type="cite" class="">
          <div class="">
            <div style="font-family: Helvetica; font-size: 12px;
              font-style: normal; font-variant-caps: normal;
              font-weight: normal; letter-spacing: normal; orphans:
              auto; text-align: start; text-indent: 0px; text-transform:
              none; white-space: normal; widows: auto; word-spacing:
              0px; -webkit-text-stroke-width: 0px;" class="">
              <div class=""><br class="">
              </div>
              <div class="">Adam</div>
              <div class=""><br class="">
              </div>
              <blockquote type="cite" class="">
                <div class="">
                  <div bgcolor="#FFFFFF" text="#000000" class=""><br class="">
                     -Hal<br class="">
                    <br class="">
                    <blockquote cite="mid:2A017F54-ED5D-4B62-A774-CCCED49E2206@apple.com" type="cite" class="">
                      <div class="">
                        <div class=""><br class="">
                        </div>
                        <div class="">Adam</div>
                        <div class=""><br class="">
                        </div>
                        <blockquote type="cite" class="">
                          <div class="">
                            <div class="" style="font-family: Helvetica;
                              font-size: 12px; font-style: normal;
                              font-variant-caps: normal; font-weight:
                              normal; letter-spacing: normal; orphans:
                              auto; text-align: start; text-indent: 0px;
                              text-transform: none; white-space: normal;
                              widows: auto; word-spacing: 0px;
                              -webkit-text-stroke-width: 0px;"><br class="">
                            </div>
                            <div class="" style="font-family: Helvetica;
                              font-size: 12px; font-style: normal;
                              font-variant-caps: normal; font-weight:
                              normal; letter-spacing: normal; orphans:
                              auto; text-align: start; text-indent: 0px;
                              text-transform: none; white-space: normal;
                              widows: auto; word-spacing: 0px;
                              -webkit-text-stroke-width: 0px;">Adam</div>
                            <br class="" style="font-family: Helvetica;
                              font-size: 12px; font-style: normal;
                              font-variant-caps: normal; font-weight:
                              normal; letter-spacing: normal; orphans:
                              auto; text-align: start; text-indent: 0px;
                              text-transform: none; white-space: normal;
                              widows: auto; word-spacing: 0px;
                              -webkit-text-stroke-width: 0px;">
                            <blockquote type="cite" class="" style="font-family: Helvetica; font-size:
                              12px; font-style: normal;
                              font-variant-caps: normal; font-weight:
                              normal; letter-spacing: normal; orphans:
                              auto; text-align: start; text-indent: 0px;
                              text-transform: none; white-space: normal;
                              widows: auto; word-spacing: 0px;
                              -webkit-text-stroke-width: 0px;">
                              <div class="">
                                <div bgcolor="#FFFFFF" text="#000000" class=""><br class="">
                                   -Hal<br class="">
                                  <br class="">
                                  <blockquote cite="mid:C5B19D31-4651-4840-B9AC-C4F6FD1BD04D@apple.com" type="cite" class="">
                                    <div class="">
                                      <div class=""><br class="">
                                      </div>
                                      <div class="">Thanks,</div>
                                      <div class="">Adam</div>
                                      <br class="">
                                      <blockquote type="cite" class="">
                                        <div class="">
                                          <div bgcolor="#FFFFFF" text="#000000" class="">I
                                            also think that having a
                                            "fast math" pragma is also a
                                            good idea (the fact that we
                                            can currently only specify
                                            fast-math settings on a
                                            translation-unit level is
                                            somewhat problematic).<br class="">
                                            <br class="">
                                            <blockquote cite="mid:E74F3BD7-4CF9-4CF7-8657-BC4776A71D03@apple.com" type="cite" class="">
                                              <div class=""><br class="">
                                                <blockquote type="cite" class="">
                                                  <div class="">
                                                    <div class="" style="word-wrap:
                                                      break-word;
                                                      -webkit-nbsp-mode:
                                                      space;
                                                      -webkit-line-break:
after-white-space;">
                                                      <div class="">
                                                        <div class=""><br class="">
                                                        </div>
                                                        <div class="">Also,
                                                          IIUC, the
                                                          function
                                                          attribute as
                                                          well as a FMF
                                                          wouldn’t apply
                                                          to the “ON”
                                                          setting but
                                                          only to the
                                                          “FAST” mode
                                                          (no way to
                                                          distinguish
                                                          source level
                                                          statement in
                                                          llvm IR).</div>
                                                      </div>
                                                    </div>
                                                  </div>
                                                </blockquote>
                                              </div>
                                            </blockquote>
                                            <br class="">
                                            Right. We still have the
                                            existing fmuladd intrinsic
                                            method for dealing with the
                                            "ON" setting.<br class="">
                                            <br class="">
                                            <blockquote cite="mid:E74F3BD7-4CF9-4CF7-8657-BC4776A71D03@apple.com" type="cite" class="">
                                              <div class="">
                                                <div class=""><br class="">
                                                </div>
                                                <div class="">Yes.</div>
                                                <div class=""><br class="">
                                                </div>
                                                <div class="">Adam</div>
                                                <br class="">
                                                <blockquote type="cite" class="">
                                                  <div class="">
                                                    <div class="" style="word-wrap:
                                                      break-word;
                                                      -webkit-nbsp-mode:
                                                      space;
                                                      -webkit-line-break:
after-white-space;">
                                                      <div class="">
                                                        <div class=""><br class="">
                                                        </div>
                                                        <div class="">— </div>
                                                        <div class="">Mehdi</div>
                                                        <div class=""><br class="">
                                                        </div>
                                                        <div class=""><br class="">
                                                        </div>
                                                        <div class=""><br class="">
                                                        </div>
                                                        <div class=""><br class="">
                                                        </div>
                                                        <br class="">
                                                        <blockquote type="cite" class="">
                                                          <div class="">
                                                          <blockquote cite="mid:FAB9D19D-F8F0-4364-BE54-5203FFB1295E@apple.com" type="cite" class="" style="font-family:
                                                          Helvetica;
                                                          font-size:
                                                          12px;
                                                          font-style:
                                                          normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          orphans: auto;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          widows: auto;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <div class=""><br class="">
                                                          </div>
                                                          <div class="">Also
                                                          now that we
                                                          have backend
                                                          optimization
                                                          remarks, I am
                                                          planning to
                                                          report missed
                                                          optimization
                                                          when we can’t
                                                          fuse FMAs due
                                                          “fast” not
                                                          being on.
                                                           This will
                                                          show up in the
                                                          opt-viewer.
                                                           Then the user
                                                          can opt in
                                                          either with
                                                          the
                                                          command-line
                                                          switch or the
                                                          new function
                                                          attribute.</div>
                                                          </blockquote>
                                                          <br class="" style="font-family:
                                                          Helvetica;
                                                          font-size:
                                                          12px;
                                                          font-style:
                                                          normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255); float:
                                                          none; display:
                                                          inline
                                                          !important;">That
                                                          seems useful.</span><br class="" style="font-family:
                                                          Helvetica;
                                                          font-size:
                                                          12px;
                                                          font-style:
                                                          normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <br class="" style="font-family:
                                                          Helvetica;
                                                          font-size:
                                                          12px;
                                                          font-style:
                                                          normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255); float:
                                                          none; display:
                                                          inline
                                                          !important;">Thanks
                                                          again,</span><br class="" style="font-family:
                                                          Helvetica;
                                                          font-size:
                                                          12px;
                                                          font-style:
                                                          normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <span class="" style="font-family: Helvetica; font-size: 12px; font-style: normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255); float:
                                                          none; display:
                                                          inline
                                                          !important;">Hal</span><br class="" style="font-family:
                                                          Helvetica;
                                                          font-size:
                                                          12px;
                                                          font-style:
                                                          normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <br class="" style="font-family:
                                                          Helvetica;
                                                          font-size:
                                                          12px;
                                                          font-style:
                                                          normal;
                                                          font-variant-caps:
                                                          normal;
                                                          font-weight:
                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <blockquote cite="mid:FAB9D19D-F8F0-4364-BE54-5203FFB1295E@apple.com" type="cite" class="" style="font-family:
                                                          Helvetica;
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                                                          12px;
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                                                          normal;
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                                                          normal;
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                                                          normal;
                                                          letter-spacing:
                                                          normal;
                                                          orphans: auto;
                                                          text-align:
                                                          start;
                                                          text-indent:
                                                          0px;
                                                          text-transform:
                                                          none;
                                                          white-space:
                                                          normal;
                                                          widows: auto;
                                                          word-spacing:
                                                          0px;
                                                          -webkit-text-stroke-width:
                                                          0px;
                                                          background-color:
                                                          rgb(255, 255,
                                                          255);">
                                                          <div class=""><br class="">
                                                          </div>
                                                          <div class="">Adam<br class="">
                                                          <div class=""><br class="">
                                                          <div class="">
                                                          <blockquote type="cite" class="">
                                                          <div class="">On
                                                          Mar 15, 2017,
                                                          at 6:27 AM,
                                                          Renato Golin
                                                          via cfe-dev
                                                          <<a moz-do-not-send="true" href="mailto:cfe-dev@lists.llvm.org" class="">cfe-dev@lists.llvm.org</a>>
                                                          wrote:</div>
                                                          <br class="Apple-interchange-newline">
                                                          <div class="">
                                                          <div class="">Folks,<br class="">
                                                          <br class="">
                                                          I've been
                                                          asking around
                                                          people about
                                                          the state of
                                                          FP contract,
                                                          which<br class="">
                                                          seems to be
                                                          "on" but it's
                                                          not really
                                                          behaving like
                                                          it, at least
                                                          not as<br class="">
                                                          I would
                                                          expect:<br class="">
                                                          <br class="">
                                                          int foo(float
                                                          a, float b,
                                                          float c) {
                                                          return a*b+c;
                                                          }<br class="">
                                                          <br class="">
                                                          $ clang
                                                          -target
                                                          aarch64-linux-gnu
                                                          -O2 -S fma.c
                                                          -ffp-contract=on
                                                          -o -<br class="">
                                                          (...)<br class="">
                                                          fmul s0, s0,
                                                          s1<br class="">
                                                          fadd s0, s0,
                                                          s2<br class="">
                                                          (...)<br class="">
                                                          <br class="">
                                                          $ clang
                                                          -target
                                                          aarch64-linux-gnu
                                                          -O2 -S fma.c
                                                          -ffp-contract=fast
                                                          -o -<br class="">
                                                          (...)<br class="">
                                                          fmadd s0, s0,
                                                          s1, s2<br class="">
                                                          (...)<br class="">
                                                          <br class="">
                                                          I'm not sure
                                                          this works in
                                                          Fortran
                                                          either, but
                                                          defaulting to
                                                          "on" when<br class="">
                                                          (I believe)
                                                          the language
                                                          should allow
                                                          contraction
                                                          and not doing
                                                          it is<br class="">
                                                          not a good
                                                          default.<br class="">
                                                          <br class="">
                                                          i haven't
                                                          worked out
                                                          what would be
                                                          necessary to
                                                          make it work
                                                          on a<br class="">
                                                          case-by-case
                                                          basis (what
                                                          kinds of
                                                          fusions does C
                                                          allow?) to
                                                          make sure<br class="">
                                                          we don't do
                                                          all or
                                                          nothing, but
                                                          if we don't
                                                          want to start
                                                          that<br class="">
                                                          conversation
                                                          now, then I'd
                                                          recommend we
                                                          just turn it
                                                          all the way to
                                                          11<br class="">
                                                          (like GCC) and
                                                          let people
                                                          turn it off if
                                                          they really
                                                          mean it.<br class="">
                                                          <br class="">
                                                          The rationale
                                                          is that:<br class="">
                                                          <br class="">
                                                          * Contracted
                                                          operations
                                                          increase
                                                          precision
                                                          (less rounding
                                                          steps)<br class="">
                                                          * It performs
                                                          equal or
                                                          faster on all
                                                          architectures
                                                          I know (true
                                                          everywhere?)<br class="">
                                                          * Users
                                                          already expect
                                                          that
                                                          (certainly,
                                                          GCC users do)<br class="">
                                                          * Makes us
                                                          look good on
                                                          benchmarks :)<br class="">
                                                          <br class="">
                                                          A recent
                                                          SPEC2k6
                                                          comparison
                                                          Linaro did for
                                                          AArch64,
                                                          enabling<br class="">
-ffp-contract=fast took the edge of GCC in a number of cases and in<br class="">
                                                          some of them
                                                          made them
                                                          comparable in
                                                          performance.
                                                          So, any
                                                          reasons not<br class="">
                                                          to?<br class="">
                                                          <br class="">
                                                          If we go with
                                                          it, we need to
                                                          first finish
                                                          the job that
                                                          Sebastian was<br class="">
                                                          dong on the
                                                          test-suite,
                                                          then just turn
                                                          it on by
                                                          default. A
                                                          second<br class="">
                                                          stage would be
                                                          to add
                                                          tests/benchmarks
                                                          that
                                                          explicitly
                                                          test FP<br class="">
                                                          precision, so
                                                          that we have
                                                          some extra
                                                          guarantee that
                                                          we're doing
                                                          the<br class="">
                                                          right thing.<br class="">
                                                          <br class="">
                                                          Opinions?<br class="">
                                                          <br class="">
                                                          cheers,<br class="">
                                                          --renato<br class="">
_______________________________________________<br class="">
                                                          cfe-dev
                                                          mailing list<br class="">
                                                          <a moz-do-not-send="true" href="mailto:cfe-dev@lists.llvm.org" class="">cfe-dev@lists.llvm.org</a><br class="">
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                                                          </div>
                                                          </blockquote>
                                                          </div>
                                                          <br class="">
                                                          </div>
                                                          </div>
                                                          <br class="">
                                                          <fieldset class="mimeAttachmentHeader"></fieldset>
                                                          <br class="">
                                                          <pre class="" wrap="">_______________________________________________
LLVM Developers mailing list
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</pre>
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                                                          <pre class="moz-signature" cols="72" style="font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);">-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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                                                          rgb(255, 255,
                                                          255); float:
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                                                          !important;">_______________________________________________</span><br class="" style="font-family:
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                                                          rgb(255, 255,
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                                                      <br class="">
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                                                </blockquote>
                                              </div>
                                              <br class="">
                                            </blockquote>
                                            <br class="">
                                            <pre class="moz-signature" cols="72">-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
                                          </div>
                                        </div>
                                      </blockquote>
                                    </div>
                                    <br class="">
                                  </blockquote>
                                  <br class="">
                                  <pre class="moz-signature" cols="72">-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
                                </div>
                              </div>
                            </blockquote>
                          </div>
                        </blockquote>
                      </div>
                      <br class="">
                    </blockquote>
                    <br class="">
                    <pre class="moz-signature" cols="72">-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
                  </div>
                </div>
              </blockquote>
            </div>
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              font-style: normal; font-variant-caps: normal;
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            <span style="font-family: Helvetica; font-size: 12px;
              font-style: normal; font-variant-caps: normal;
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              0px; -webkit-text-stroke-width: 0px; float: none; display:
              inline !important;" class="">_______________________________________________</span><br style="font-family: Helvetica; font-size: 12px;
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              auto; text-align: start; text-indent: 0px; text-transform:
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        </blockquote>
      </div>
      <br class="">
    </blockquote>
    <br class="">
    <pre class="moz-signature" cols="72">-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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