<html>
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<p>The fix mentioned below has landed. In a couple of days, I plan
to restore the original patch and see what if anything else falls
out. I'll probably wait for the weekend so that it's a slow day
to minimize bot fallout if any. <br>
</p>
<p>@Stefan - I remember seeing a set of test results from a combined
patch (fix plus original) on the PPC builders, but can't for the
life of me find that email now. Do you remember where that was?
Or what the results were? I don't want to resubmit if we already
know about additional breakage.</p>
<p>Philip<br>
</p>
<div class="moz-cite-prefix">On 6/4/21 8:53 AM, Philip Reames via
llvm-commits wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ec4fc021-c919-bef7-55dc-fc26fdfd0b74@philipreames.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>I have a fix for what I think is the root issue here out for
review: <a class="moz-txt-link-freetext"
href="https://reviews.llvm.org/D103700" moz-do-not-send="true">https://reviews.llvm.org/D103700</a></p>
<p>As I suspected, the reverted patch was exposing an existing
issue, not introducing a new one. However, the bug does still
appear to have been mine, it was just introduced back in
4b33b2387787a, and hasn't otherwise come up.</p>
<p>Thanks again for the help here. Hugely appreciated.<br>
</p>
<p>Philip<br>
</p>
<div class="moz-cite-prefix">On 5/27/21 11:29 AM, Stefan Pintilie
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:OF19D50B3B.B1905522-ON002586E2.00654CFA-002586E2.00659820@notes.na.collabserv.com">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<div class="socmaildefaultfont" dir="ltr"
style="font-family:Arial, Helvetica,
sans-serif;font-size:10pt">
<div dir="ltr"> </div>
<div dir="ltr">Hi Philip,</div>
<div dir="ltr"> </div>
<div dir="ltr">We have managed to track down more information
on the issue causing the failure with the LV patch.<br>
It seems that Cost->requiresScalarEpilogue() sometimes
returns true when the scalar epilogue is actually not
required.<br>
One of the failing tests is:<br>
test-suite/SingleSource/Benchmarks/Misc/oourafft.c<br>
That test has a loop that runs a fixed 1024 times. If the
max vector interleave is a factor of 1024 then
Cost->requiresScalarEpilogue() still returns true even
though the scalar epilogue is not actually required.<br>
The following examples were run on a Little Endian machine:<br>
FAIL - clang -DNDEBUG -fuse-ld=ld -O3 -DNDEBUG -w
-Werror=date-time -mllvm -force-vector-interleave=4
${TESTSUITE}/SingleSource/Benchmarks/Misc/oourafft.c -lm<br>
FAIL - clang -DNDEBUG -fuse-ld=ld -O3 -DNDEBUG -w
-Werror=date-time -mllvm -force-vector-interleave=8
${TESTSUITE}/SingleSource/Benchmarks/Misc/oourafft.c -lm<br>
PASS - clang -DNDEBUG -fuse-ld=ld -O3 -DNDEBUG -w
-Werror=date-time -mllvm -force-vector-interleave=12
${TESTSUITE}/SingleSource/Benchmarks/Misc/oourafft.c -lm<br>
Looking at the IR immediately following LV we see this.</div>
<div dir="ltr"> </div>
<div dir="ltr">Working IR:<br>
middle.block:<br>
%cmp.n = icmp eq i64 1024, 1024<br>
br i1 %cmp.n, label %for.end, label %scalar.ph </div>
<div dir="ltr"> </div>
<div dir="ltr">Failing IR:<br>
middle.block:<br>
br label %scalar.ph</div>
<div dir="ltr"><br>
We traced the problem to
InterleavedAccessInfo::analyzeInterleaving where we set
RequiresScalarEpilogue to true.<br>
We probably shouldn't be setting that to TRUE for this test
case. Perhaps it matters that the loop wasn't actually
vectorized in this case (VF == 1). That may impact the
computation of RequiresScalarEpilogue.</div>
<div dir="ltr"> </div>
<div dir="ltr">Hope this helps,<br>
Stefan</div>
<div dir="ltr"> </div>
<blockquote data-history-content-modified="1" dir="ltr"
style="border-left:solid #aaaaaa 2px; margin-left:5px;
padding-left:5px; direction:ltr; margin-right:0px">-----
Original message -----<br>
From: Stefan Pintilie via llvm-commits <a
class="moz-txt-link-rfc2396E"
href="mailto:llvm-commits@lists.llvm.org"
moz-do-not-send="true"><llvm-commits@lists.llvm.org></a><br>
Sent by: "llvm-commits" <a class="moz-txt-link-rfc2396E"
href="mailto:llvm-commits-bounces@lists.llvm.org"
moz-do-not-send="true"><llvm-commits-bounces@lists.llvm.org></a><br>
To: <a class="moz-txt-link-abbreviated"
href="mailto:listmail@philipreames.com"
moz-do-not-send="true">listmail@philipreames.com</a><br>
Cc: <a class="moz-txt-link-abbreviated"
href="mailto:llvmlistbot@llvm.org" moz-do-not-send="true">llvmlistbot@llvm.org</a>,
<a class="moz-txt-link-abbreviated"
href="mailto:llvm-commits@lists.llvm.org"
moz-do-not-send="true">llvm-commits@lists.llvm.org</a>, <a
class="moz-txt-link-abbreviated"
href="mailto:benny.kra@gmail.com" moz-do-not-send="true">benny.kra@gmail.com</a>,
Nemanja Ivanovic <a class="moz-txt-link-rfc2396E"
href="mailto:nemanjai@ca.ibm.com" moz-do-not-send="true"><nemanjai@ca.ibm.com></a>,
<a class="moz-txt-link-abbreviated"
href="mailto:akuegel@google.com" moz-do-not-send="true">akuegel@google.com</a>,
LLVM on Power <a class="moz-txt-link-rfc2396E"
href="mailto:powerllvm@ca.ibm.com" moz-do-not-send="true"><powerllvm@ca.ibm.com></a><br>
Subject: [EXTERNAL] RE: [llvm] 7fe41ac - Revert "[LV]
Unconditionally branch from middle to scalar preheader if
the scalar loop must execute"<br>
Date: Tue, May 25, 2021 7:53 PM<br>
<div dir="ltr" style="font-family:Arial, Helvetica,
sans-serif;font-size:10pt">
<div dir="ltr"> </div>
<div dir="ltr">Hi Philip,<br>
<br>
I have run a -print-after-all and I'm going to send you
the IR before and after the Loop Vectorize pass.
Hopefully this will help.<br>
Let me know if you need more information or if you want
me to run something on my end.<br>
</div>
<div dir="ltr">Best,</div>
<div dir="ltr">Stefan</div>
<div dir="ltr"> </div>
<blockquote data-history-content-modified="1" dir="ltr"
style="border-left:solid #aaaaaa 2px; margin-left:5px;
padding-left:5px; direction:ltr; margin-right:0px">-----
Original message -----<br>
From: Philip Reames <a class="moz-txt-link-rfc2396E"
href="mailto:listmail@philipreames.com"
moz-do-not-send="true"><listmail@philipreames.com></a><br>
To: Nemanja Ivanovic <a class="moz-txt-link-rfc2396E"
href="mailto:nemanjai@ca.ibm.com"
moz-do-not-send="true"><nemanjai@ca.ibm.com></a><br>
Cc: <a class="moz-txt-link-abbreviated"
href="mailto:akuegel@google.com"
moz-do-not-send="true">akuegel@google.com</a>, <a
class="moz-txt-link-abbreviated"
href="mailto:benny.kra@gmail.com"
moz-do-not-send="true">benny.kra@gmail.com</a>, <a
class="moz-txt-link-abbreviated"
href="mailto:llvm-commits@lists.llvm.org"
moz-do-not-send="true">llvm-commits@lists.llvm.org</a>,
<a class="moz-txt-link-abbreviated"
href="mailto:llvmlistbot@llvm.org"
moz-do-not-send="true">llvmlistbot@llvm.org</a>, LLVM
on Power <a class="moz-txt-link-rfc2396E"
href="mailto:powerllvm@ca.ibm.com"
moz-do-not-send="true"><powerllvm@ca.ibm.com></a>,
Stefan Pintilie <a class="moz-txt-link-rfc2396E"
href="mailto:stefanp@ca.ibm.com"
moz-do-not-send="true"><stefanp@ca.ibm.com></a><br>
Subject: [EXTERNAL] Re: [llvm] 7fe41ac - Revert "[LV]
Unconditionally branch from middle to scalar preheader
if the scalar loop must execute"<br>
Date: Tue, May 25, 2021 5:38 PM<br>
<br>
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If you have the before and after IR, that's really all
I probably need. If you share those, I can take the
investigation from there. Philip On 5/25/21 2:12 PM,
Nemanja Ivanovic wrote:
</span>
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<p>If you have the before and after IR, that's really
all I probably need. If you share those, I can take
the investigation from there.</p>
<p>Philip</p>
<div>On 5/25/21 2:12 PM, Nemanja Ivanovic wrote:</div>
<blockquote
cite="mid:OFC99B9E23.4F6BE4A3-ON002586E0.00745021-002586E0.00748300@notes.na.collabserv.com"
type="cite"><!--Notes ACF
<meta http-equiv="content-type" content="text/html; charset=utf8" >-->
<div dir="ltr" style="font-family:Arial, Helvetica,
sans-serif;font-size:10pt">
<div dir="ltr">Hi Philip,</div>
<div dir="ltr">I am sorry about the late reply -
this was a 4 day weekend here in Toronto. We kind
of started with looking at the difference in the
post-LV IR with and without your patch for the
SingleSource test case. Stefan is currently
looking at it and we're hoping to figure out
what's going on soon. Would it help you if we
shared the two IR files with you to get your
opinion on what might be happening as well?</div>
<div dir="ltr"> </div>
<div dir="ltr">Nemanja Ivanovic<br>
LLVM PPC Backend Development<br>
IBM Toronto Lab<br>
Email: <a href="mailto:nemanjai@ca.ibm.com"
target="_blank" moz-do-not-send="true">nemanjai@ca.ibm.com</a><br>
Phone: 905-413-3388</div>
<div dir="ltr"> </div>
<div dir="ltr"> </div>
<blockquote data-history-content-modified="1"
dir="ltr" style="border-left:solid #aaaaaa 2px;
margin-left:5px; padding-left:5px; direction:ltr;
margin-right:0px">----- Original message -----<br>
From: Philip Reames <a
href="mailto:listmail@philipreames.com"
target="_blank" moz-do-not-send="true"><listmail@philipreames.com></a><br>
To: Nemanja Ivanovic <a
href="mailto:nemanjai@ca.ibm.com"
target="_blank" moz-do-not-send="true"><nemanjai@ca.ibm.com></a><br>
Cc: <a href="mailto:akuegel@google.com"
target="_blank" moz-do-not-send="true">akuegel@google.com</a>,
<a href="mailto:benny.kra@gmail.com"
target="_blank" moz-do-not-send="true">benny.kra@gmail.com</a>,
<a href="mailto:llvm-commits@lists.llvm.org"
target="_blank" moz-do-not-send="true">llvm-commits@lists.llvm.org</a>,
<a href="mailto:llvmlistbot@llvm.org"
target="_blank" moz-do-not-send="true">llvmlistbot@llvm.org</a>,
LLVM on Power <a
href="mailto:powerllvm@ca.ibm.com"
target="_blank" moz-do-not-send="true"><powerllvm@ca.ibm.com></a><br>
Subject: [EXTERNAL] Re: [llvm] 7fe41ac - Revert
"[LV] Unconditionally branch from middle to scalar
preheader if the scalar loop must execute"<br>
Date: Wed, May 19, 2021 2:15 PM<br>
<br>
<!--Notes ACF
<meta http-equiv="Content-Type" content="text/html; charset=utf8" >-->
<p>Looking at the various failures, I see both LE
and BE bots failing. The BE bot shows a
miscompile in one of the test suite benchmarks.
The LE bots appear to be showing a crash while
using a stage1 build clang to build stage2
clang. </p>
<p>LE example: <a
href="https://lab.llvm.org/buildbot#builders/19/builds/4236"
moz-do-not-send="true" target="_blank">https://lab.llvm.org/buildbot#builders/19/builds/4236</a><br>
BE example: <a
href="https://lab.llvm.org/buildbot#builders/100/builds/5762"
moz-do-not-send="true" target="_blank">https://lab.llvm.org/buildbot#builders/100/builds/5762</a></p>
<p>So both are showing miscompiles, just with
different symptoms. Frankly, the BE looks
easier to debug (much code making it into the
miscompiled binary.)</p>
<p>Oddly, pretty much only PPC bots are failing.
The one exception is a stage2 failure on AArch64
(<a
href="https://lab.llvm.org/buildbot/#/builders/111/builds/2027"
moz-do-not-send="true" target="_blank">https://lab.llvm.org/buildbot/#/builders/111/builds/2027</a>)
which looks similar to the LE failure above. </p>
<p>Given this appears to be target specific, I am
*guessing* there's some vectorizer hook which is
causing a different codepath to be executed.
Before we start trying to get me access to
hardware, do you have any guesses on what that
hook might be? If you can give me a good hint
on where to look, I suspect I can probably find
the issue that way. </p>
<p>Philip</p>
<div>On 5/18/21 3:07 AM, Nemanja Ivanovic wrote:</div>
<blockquote
cite="mid:OF443062AC.F5998286-ON002586D9.00373B50-002586D9.0037A584@notes.na.collabserv.com"
type="cite"><!--Notes ACF
<meta http-equiv="content-type" content="text/html; charset=utf8" >-->
<div dir="ltr" style="font-family:Arial,
Helvetica, sans-serif;font-size:10pt">
<div dir="ltr">Hi Philip,</div>
<div dir="ltr">I am not sure what happened
with your first attempt to contact us and
how we missed it. We would be more than
happy to help you debug this issue. Do you
know if this only affects the big endian bot
or if it also fails on little endian bots?
In the latter case, we can certainly provide
access to a little endian machine hosted at
OSU/OSL. In the former case, we don't have a
machine available and we'll have to do the
debugging and report to you (which might
take a bit longer).</div>
<div dir="ltr"> </div>
<div dir="ltr">Nemanja Ivanovic<br>
LLVM PPC Backend Development<br>
IBM Toronto Lab<br>
Email: <a href="mailto:nemanjai@ca.ibm.com"
moz-do-not-send="true" target="_blank">nemanjai@ca.ibm.com</a><br>
Phone: 905-413-3388</div>
<div dir="ltr"> </div>
<div dir="ltr"> </div>
<blockquote data-history-content-modified="1"
data-history-expanded="1" dir="ltr"
style="border-left:solid #aaaaaa 2px;
margin-left:5px; padding-left:5px;
direction:ltr; margin-right:0px">-----
Original message -----<br>
From: Philip Reames <a
href="mailto:listmail@philipreames.com"
moz-do-not-send="true" target="_blank"><listmail@philipreames.com></a><br>
To: Adrian Kuegel <a
href="mailto:akuegel@google.com"
moz-do-not-send="true" target="_blank"><akuegel@google.com></a><br>
Cc: Benjamin Kramer <a
href="mailto:benny.kra@gmail.com"
moz-do-not-send="true" target="_blank"><benny.kra@gmail.com></a>,
Adrian Kuegel <a
href="mailto:llvmlistbot@llvm.org"
moz-do-not-send="true" target="_blank"><llvmlistbot@llvm.org></a>,
llvm-commits <a
href="mailto:llvm-commits@lists.llvm.org"
moz-do-not-send="true" target="_blank"><llvm-commits@lists.llvm.org></a>,
<a href="mailto:powerllvm@ca.ibm.com"
moz-do-not-send="true" target="_blank">powerllvm@ca.ibm.com</a><br>
Subject: [EXTERNAL] Re: [llvm] 7fe41ac -
Revert "[LV] Unconditionally branch from
middle to scalar preheader if the scalar
loop must execute"<br>
Date: Mon, May 17, 2021 11:59 PM<br>
<br>
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I tried another cycle to see if this had
been resolved, but am still seeing build
bot failures, nearly exclusively on PPC.
(And one arm self host bot.) @PPC Bot
Owner - I need help reducing a test case
for the failure seen here:
</span>
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<p>I tried another cycle to see if this had
been resolved, but am still seeing build
bot failures, nearly exclusively on PPC.
(And one arm self host bot.) </p>
<p>@PPC Bot Owner - I need help reducing a
test case for the failure seen here: <a
href="https://lab.llvm.org/buildbot#builders/100/builds/5762"
moz-do-not-send="true" target="_blank">https://lab.llvm.org/buildbot#builders/100/builds/5762</a>.
I am stuck, and unable to make progress
for nearly 3 months now. I would greatly
appreciate help. </p>
<p>Philip</p>
<div>On 5/5/21 11:59 PM, Adrian Kuegel
wrote:</div>
<blockquote
cite="mid:CAHhV=OX3NbAExy4YsQWLH0fC-zXiG_VpToAtB72NhkUwwYekRQ@mail.gmail.com"
type="cite"><!--Notes ACF
<meta http-equiv="content-type" content="text/html; charset=utf8" >-->
<div dir="ltr">
<div dir="ltr">Sounds good to me, and
thanks for sending the heads up :)</div>
<div>
<div dir="ltr">On Wed, May 5, 2021 at
10:01 PM Philip Reames <<a
href="mailto:listmail@philipreames.com"
moz-do-not-send="true"
target="_blank">listmail@philipreames.com</a>>
wrote:</div>
<blockquote style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">FYI,
I'm going to try recommitting this
without changes in a day or so.<br>
<br>
I never heard back from a PPC bot
owner, and I don't have enough<br>
information to really debug anything
from the builtbot log. I did run<br>
across a latent issue which this
patch may very well have exposed at<br>
much higher frequency; the previous
patch in this series (which is much<br>
more restrictive) does appear to
have increased frequency. That was<br>
worked around in 80e80250. My
educated guess is that same issue<br>
triggered the miscompile seen on the
ppc bot, but that is more of a<br>
guess than I'd really prefer.<br>
<br>
I'm going to submit this during off
hours, and watch the bots fairly<br>
closely after submit. Hopefully
this either cycles clean or I get a<br>
better clue as to what the root
issue is.<br>
<br>
Philip<br>
<br>
On 2/8/21 9:09 PM, Philip Reames via
llvm-commits wrote:<br>
> Ben,<br>
><br>
> Thanks for the clarification.
The log does not make the fact this
is<br>
> an execution failure obvious.<br>
><br>
> No, I don't have access to a
PPC machine.<br>
><br>
> I am going to need some
assistance from the bot owner on
this. At a<br>
> minimum, IR for the test in
question (before optimization, but
on<br>
> target platform) seems like a
reasonable ask.<br>
><br>
> I strongly suspect this change
is simply exposing another latent<br>
> issue. Or at least, I've
reviewed the change and don't see
anything<br>
> likely to cause runtime crashes
w/o also tripping compiler asserts.<br>
><br>
> Philip<br>
><br>
><br>
> On 2/8/21 5:21 AM, Benjamin
Kramer wrote:<br>
>> `execution_time` failures
mean that the bot succeeded building
a test<br>
>> but it failed when running
it. I'm relatively certain that this
is the<br>
>> same issue Adrian is seeing
-- binaries segfaulting early on
PPC.<br>
>><br>
>> The bot log output isn't
helpful at all for investigating why
this is<br>
>> happening. Do you happen to
have access to a PPC machine?<br>
>><br>
>> On Fri, Feb 5, 2021 at 6:05
PM Philip Reames via llvm-commits<br>
>> <<a
href="mailto:llvm-commits@lists.llvm.org"
moz-do-not-send="true"
target="_blank">llvm-commits@lists.llvm.org</a>>
wrote:<br>
>>> Adrian,<br>
>>><br>
>>> I'm going to need you
to provide a bit more information
here. The test<br>
>>> failure in stage1 was
fixed at the time you reverted this
patch. The<br>
>>> remaining failure in
the bot is very unclear. What is a
execution_time<br>
>>> failure? From the log
output, the "failing" run finished
in 0.5<br>
>>> seconds,<br>
>>> whereas the previous
"succeeding" run finished in 11
seconds. Without<br>
>>> further context, I'd
say that's no failure.<br>
>>><br>
>>> I'll also note that I
did not receive email from this
bot. I received<br>
>>> notice from the various
other bots and fixed the ARM test
issue, but<br>
>>> unless I missed it in
with the others, this bot is not
notifying.<br>
>>><br>
>>> In general, I'm a fan
of fast reverts, but I have to
admit, this one<br>
>>> appears borderline at
the moment.<br>
>>><br>
>>> Philip<br>
>>><br>
>>> On 2/5/21 3:53 AM,
Adrian Kuegel via llvm-commits
wrote:<br>
>>>> Author: Adrian
Kuegel<br>
>>>> Date:
2021-02-05T12:51:03+01:00<br>
>>>> New Revision:
7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c<br>
>>>><br>
>>>> URL:<br>
>>>> <a
href="https://github.com/llvm/llvm-project/commit/7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c"
moz-do-not-send="true"
rel="noreferrer" target="_blank">https://github.com/llvm/llvm-project/commit/7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c</a><br>
>>>> DIFF:<br>
>>>> <a
href="https://github.com/llvm/llvm-project/commit/7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c.diff"
moz-do-not-send="true"
rel="noreferrer" target="_blank">https://github.com/llvm/llvm-project/commit/7fe41ac3dff2d44c3d2c31b28554fbe4a86eaa6c.diff</a><br>
>>>><br>
>>>> LOG: Revert "[LV]
Unconditionally branch from middle
to scalar<br>
>>>> preheader if the
scalar loop must execute"<br>
>>>><br>
>>>> This reverts commit
3e5ce49e5371ce4feadbf97dd5c2b652d9db3d1d.<br>
>>>><br>
>>>> Tests started
failing on PPC, for example:<br>
>>>> <a
href="http://lab.llvm.org:8011/#/builders/105/builds/5569"
moz-do-not-send="true"
rel="noreferrer" target="_blank">http://lab.llvm.org:8011/#/builders/105/builds/5569</a><br>
>>>><br>
>>>> Added:<br>
>>>><br>
>>>><br>
>>>> Modified:<br>
>>>>
llvm/lib/Transforms/Utils/LoopVersioning.cpp<br>
>>>>
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp<br>
>>>>
llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll<br>
>>>>
llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll<br>
>>>>
llvm/test/Transforms/LoopVectorize/loop-form.ll<br>
>>>><br>
>>>> Removed:<br>
>>>><br>
>>>><br>
>>>><br>
>>>>
################################################################################<br>
>>>><br>
>>>> diff --git
a/llvm/lib/Transforms/Utils/LoopVersioning.cpp<br>
>>>>
b/llvm/lib/Transforms/Utils/LoopVersioning.cpp<br>
>>>> index
8a89158788cf..de4fb446fdf2 100644<br>
>>>> ---
a/llvm/lib/Transforms/Utils/LoopVersioning.cpp<br>
>>>> +++
b/llvm/lib/Transforms/Utils/LoopVersioning.cpp<br>
>>>> @@ -44,11 +44,11 @@
LoopVersioning::LoopVersioning(const<br>
>>>> LoopAccessInfo
&LAI,<br>
>>>>
AliasChecks(Checks.begin(),
Checks.end()),<br>
>>>>
Preds(LAI.getPSE().getUnionPredicate()),
LAI(LAI), LI(LI),<br>
>>>> DT(DT),<br>
>>>> SE(SE) {<br>
>>>> +
assert(L->getUniqueExitBlock()
&& "No single exit block");<br>
>>>> }<br>
>>>><br>
>>>> void
LoopVersioning::versionLoop(<br>
>>>> const
SmallVectorImpl<Instruction *>
&DefsUsedOutside) {<br>
>>>> -
assert(VersionedLoop->getUniqueExitBlock()
&& "No single exit<br>
>>>> block");<br>
>>>>
assert(VersionedLoop->isLoopSimplifyForm()
&&<br>
>>>> "Loop
is not in loop-simplify form");<br>
>>>><br>
>>>><br>
>>>> diff --git
a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp<br>
>>>>
b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp<br>
>>>> index
3277842edbfe..6bce0caeb36f 100644<br>
>>>> ---
a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp<br>
>>>> +++
b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp<br>
>>>> @@ -852,7 +852,7 @@
class InnerLoopVectorizer {<br>
>>>> /// Middle
Block between the vector and the
scalar.<br>
>>>> BasicBlock
*LoopMiddleBlock;<br>
>>>><br>
>>>> - /// The unique
ExitBlock of the scalar loop if one
exists. Note<br>
>>>> that<br>
>>>> + /// The (unique)
ExitBlock of the scalar loop. Note
that<br>
>>>> /// there can
be multiple exiting edges reaching
this block.<br>
>>>> BasicBlock
*LoopExitBlock;<br>
>>>><br>
>>>> @@ -3147,13 +3147,9
@@ void<br>
>>>>
InnerLoopVectorizer::emitMinimumIterationCountCheck(Loop
*L,<br>
>>>>
DT->getNode(Bypass)->getIDom())
&&<br>
>>>> "TC
check is expected to dominate
Bypass");<br>
>>>><br>
>>>> - // Update
dominator for Bypass & LoopExit
(if needed).<br>
>>>> + // Update
dominator for Bypass & LoopExit.<br>
>>>>
DT->changeImmediateDominator(Bypass,
TCCheckBlock);<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - // If there is
an epilogue which must run, there's
no edge<br>
>>>> from the<br>
>>>> - // middle
block to exit blocks and thus no
need to update the<br>
>>>> immediate<br>
>>>> - // dominator
of the exit blocks.<br>
>>>> -
DT->changeImmediateDominator(LoopExitBlock,
TCCheckBlock);<br>
>>>> +
DT->changeImmediateDominator(LoopExitBlock,
TCCheckBlock);<br>
>>>><br>
>>>>
ReplaceInstWithInst(<br>
>>>>
TCCheckBlock->getTerminator(),<br>
>>>> @@ -3192,11 +3188,7
@@ void<br>
>>>>
InnerLoopVectorizer::emitSCEVChecks(Loop
*L, BasicBlock *Bypass) {<br>
>>>> // Update
dominator only if this is first RT
check.<br>
>>>> if
(LoopBypassBlocks.empty()) {<br>
>>>>
DT->changeImmediateDominator(Bypass,
SCEVCheckBlock);<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - // If there
is an epilogue which must run,
there's no edge<br>
>>>> from the<br>
>>>> - // middle
block to exit blocks and thus no
need to update<br>
>>>> the immediate<br>
>>>> - // dominator
of the exit blocks.<br>
>>>> -
DT->changeImmediateDominator(LoopExitBlock,
SCEVCheckBlock);<br>
>>>> +
DT->changeImmediateDominator(LoopExitBlock,
SCEVCheckBlock);<br>
>>>> }<br>
>>>><br>
>>>>
ReplaceInstWithInst(<br>
>>>> @@ -3252,11 +3244,7
@@ void<br>
>>>>
InnerLoopVectorizer::emitMemRuntimeChecks(Loop
*L, BasicBlock<br>
>>>> *Bypass) {<br>
>>>> // Update
dominator only if this is first RT
check.<br>
>>>> if
(LoopBypassBlocks.empty()) {<br>
>>>>
DT->changeImmediateDominator(Bypass,
MemCheckBlock);<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - // If there
is an epilogue which must run,
there's no edge<br>
>>>> from the<br>
>>>> - // middle
block to exit blocks and thus no
need to update<br>
>>>> the immediate<br>
>>>> - // dominator
of the exit blocks.<br>
>>>> -
DT->changeImmediateDominator(LoopExitBlock,
MemCheckBlock);<br>
>>>> +
DT->changeImmediateDominator(LoopExitBlock,
MemCheckBlock);<br>
>>>> }<br>
>>>><br>
>>>> Instruction
*FirstCheckInst;<br>
>>>> @@ -3381,10 +3369,9
@@ Value<br>
>>>>
*InnerLoopVectorizer::emitTransformedIndex(<br>
>>>> Loop
*InnerLoopVectorizer::createVectorLoopSkeleton(StringRef<br>
>>>> Prefix) {<br>
>>>> LoopScalarBody
= OrigLoop->getHeader();<br>
>>>>
LoopVectorPreHeader =
OrigLoop->getLoopPreheader();<br>
>>>> + LoopExitBlock =
OrigLoop->getUniqueExitBlock();<br>
>>>> +
assert(LoopExitBlock &&
"Must have an exit block");<br>
>>>>
assert(LoopVectorPreHeader
&& "Invalid loop
structure");<br>
>>>> - LoopExitBlock =
OrigLoop->getUniqueExitBlock();
// may be nullptr<br>
>>>> -
assert((LoopExitBlock ||
Cost->requiresScalarEpilogue())
&&<br>
>>>> - "multiple
exit loop without required
epilogue?");<br>
>>>><br>
>>>>
LoopMiddleBlock =<br>
>>>>
SplitBlock(LoopVectorPreHeader,<br>
>>>>
LoopVectorPreHeader->getTerminator(),
DT,<br>
>>>> @@ -3393,20
+3380,12 @@ Loop<br>
>>>>
*InnerLoopVectorizer::createVectorLoopSkeleton(StringRef
Prefix) {<br>
>>>>
SplitBlock(LoopMiddleBlock,<br>
>>>>
LoopMiddleBlock->getTerminator(),
DT, LI,<br>
>>>>
nullptr, Twine(Prefix) + "<a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>");<br>
>>>><br>
>>>> + // Set up branch
from middle block to the exit and
scalar<br>
>>>> preheader blocks.<br>
>>>> + //
completeLoopSkeleton will update the
condition to use an<br>
>>>> iteration check,<br>
>>>> + // if required
to decide whether to execute the
remainder.<br>
>>>> + BranchInst
*BrInst =<br>
>>>> +
BranchInst::Create(LoopExitBlock,
LoopScalarPreHeader,<br>
>>>> Builder.getTrue());<br>
>>>> auto
*ScalarLatchTerm =<br>
>>>>
OrigLoop->getLoopLatch()->getTerminator();<br>
>>>> -<br>
>>>> - // Set up the
middle block terminator. Two cases:<br>
>>>> - // 1) If we know
that we must execute the scalar
epilogue, emit an<br>
>>>> - //
unconditional branch.<br>
>>>> - // 2) Otherwise,
we must have a single unique exit
block (due to<br>
>>>> how we<br>
>>>> - // implement
the multiple exit case). In this
case, set up a<br>
>>>> conditonal<br>
>>>> - // branch
from the middle block to the loop
scalar preheader,<br>
>>>> and the<br>
>>>> - // exit
block. completeLoopSkeleton will
update the<br>
>>>> condition to use an<br>
>>>> - // iteration
check, if required to decide whether
to execute<br>
>>>> the remainder.<br>
>>>> - BranchInst
*BrInst =
Cost->requiresScalarEpilogue() ?<br>
>>>> -
BranchInst::Create(LoopScalarPreHeader)
:<br>
>>>> -
BranchInst::Create(LoopExitBlock,
LoopScalarPreHeader,<br>
>>>>
-
Builder.getTrue());<br>
>>>>
BrInst->setDebugLoc(ScalarLatchTerm->getDebugLoc());<br>
>>>>
ReplaceInstWithInst(LoopMiddleBlock->getTerminator(),
BrInst);<br>
>>>><br>
>>>> @@ -3418,11 +3397,7
@@ Loop<br>
>>>>
*InnerLoopVectorizer::createVectorLoopSkeleton(StringRef
Prefix) {<br>
>>>>
nullptr, nullptr, Twine(Prefix) +
"vector.body");<br>
>>>><br>
>>>> // Update
dominator for loop exit.<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - // If there is
an epilogue which must run, there's
no edge<br>
>>>> from the<br>
>>>> - // middle
block to exit blocks and thus no
need to update the<br>
>>>> immediate<br>
>>>> - // dominator
of the exit blocks.<br>
>>>> -
DT->changeImmediateDominator(LoopExitBlock,
LoopMiddleBlock);<br>
>>>> +
DT->changeImmediateDominator(LoopExitBlock,
LoopMiddleBlock);<br>
>>>><br>
>>>> // Create and
register the new vector loop.<br>
>>>> Loop *Lp =
LI->AllocateLoop();<br>
>>>> @@ -3519,14
+3494,10 @@ BasicBlock<br>
>>>>
*InnerLoopVectorizer::completeLoopSkeleton(Loop
*L,<br>
>>>> auto
*ScalarLatchTerm =<br>
>>>>
OrigLoop->getLoopLatch()->getTerminator();<br>
>>>><br>
>>>> // Add a check
in the middle block to see if we
have completed<br>
>>>> - // all of the
iterations in the first vector
loop. Three cases:<br>
>>>> - // 1) If we
require a scalar epilogue, there is
no conditional<br>
>>>> branch as<br>
>>>> - // we
unconditionally branch to the scalar
preheader. Do<br>
>>>> nothing.<br>
>>>> - // 2) If (N -
N%VF) == N, then we *don't* need to
run the<br>
>>>> remainder.<br>
>>>> - // Thus if
tail is to be folded, we know we
don't need to run<br>
>>>> the<br>
>>>> - // remainder
and we can use the previous value
for the<br>
>>>> condition (true).<br>
>>>> - // 3) Otherwise,
construct a runtime check.<br>
>>>> - if
(!Cost->requiresScalarEpilogue()
&&<br>
>>>>
!Cost->foldTailByMasking()) {<br>
>>>> + // all of the
iterations in the first vector loop.<br>
>>>> + // If (N - N%VF)
== N, then we *don't* need to run
the remainder.<br>
>>>> + // If tail is to
be folded, we know we don't need to
run the<br>
>>>> remainder.<br>
>>>> + if
(!Cost->foldTailByMasking()) {<br>
>>>> Instruction
*CmpN =
CmpInst::Create(Instruction::ICmp,<br>
>>>> CmpInst::ICMP_EQ,<br>
>>>>
Count, VectorTripCount,<br>
>>>> "cmp.n",<br>
>>>>
LoopMiddleBlock->getTerminator());<br>
>>>> @@ -3590,17
+3561,17 @@ BasicBlock<br>
>>>>
*InnerLoopVectorizer::createVectorizedLoopSkeleton()
{<br>
>>>> | [ ]_|
<-- vector loop.<br>
>>>> | |<br>
>>>> | v<br>
>>>> - \ -[ ]
<--- middle-block.<br>
>>>> - \/ |<br>
>>>> - /\ v<br>
>>>> - | ->[ ]
<--- new preheader.<br>
>>>> + | -[ ]
<--- middle-block.<br>
>>>> + | / |<br>
>>>> + | / v<br>
>>>> + -|- >[ ]
<--- new preheader.<br>
>>>> | |<br>
>>>> - (opt) v
<-- edge from middle to exit iff
epilogue is not<br>
>>>> required.<br>
>>>> + | v<br>
>>>> | [ ] \<br>
>>>> - | [ ]_|
<-- old scalar loop to handle
remainder (scalar<br>
>>>> epilogue).<br>
>>>> + | [ ]_|
<-- old scalar loop to handle
remainder.<br>
>>>> \ |<br>
>>>> \ v<br>
>>>> - >[ ]
<-- exit block(s).<br>
>>>> + >[ ]
<-- exit block.<br>
>>>> ...<br>
>>>> */<br>
>>>><br>
>>>> @@ -4021,18
+3992,13 @@ void<br>
>>>>
InnerLoopVectorizer::fixVectorizedLoop()
{<br>
>>>> // Forget the
original basic block.<br>
>>>>
PSE.getSE()->forgetLoop(OrigLoop);<br>
>>>><br>
>>>> - // If we
inserted an edge from the middle
block to the unique<br>
>>>> exit block,<br>
>>>> - // update uses
outside the loop (phis) to account
for the newly<br>
>>>> inserted<br>
>>>> - // edge.<br>
>>>> - if
(!Cost->requiresScalarEpilogue())
{<br>
>>>> - // Fix-up
external users of the induction
variables.<br>
>>>> - for (auto
&Entry :
Legal->getInductionVars())<br>
>>>> -
fixupIVUsers(Entry.first,
Entry.second,<br>
>>>> -
getOrCreateVectorTripCount(LI->getLoopFor(LoopVectorBody)),<br>
>>>> -
IVEndValues[Entry.first],
LoopMiddleBlock);<br>
>>>> + // Fix-up
external users of the induction
variables.<br>
>>>> + for (auto
&Entry :
Legal->getInductionVars())<br>
>>>> +
fixupIVUsers(Entry.first,
Entry.second,<br>
>>>> +
getOrCreateVectorTripCount(LI->getLoopFor(LoopVectorBody)),<br>
>>>> +
IVEndValues[Entry.first],
LoopMiddleBlock);<br>
>>>><br>
>>>> -
fixLCSSAPHIs();<br>
>>>> - }<br>
>>>> + fixLCSSAPHIs();<br>
>>>> for
(Instruction *PI :
PredicatedInstructions)<br>
>>>>
sinkScalarOperands(&*PI);<br>
>>>><br>
>>>> @@ -4250,13
+4216,12 @@ void<br>
>>>>
InnerLoopVectorizer::fixFirstOrderRecurrence(PHINode
*Phi) {<br>
>>>> // recurrence
in the exit block, and then add an
edge for the<br>
>>>> middle block.<br>
>>>> // Note that
LCSSA does not imply single entry
when the<br>
>>>> original scalar
loop<br>
>>>> // had
multiple exiting edges (as we always
run the last<br>
>>>> iteration in the<br>
>>>> - // scalar
epilogue); in that case, there is no
edge from middle<br>
>>>> to exit and<br>
>>>> - // and thus no
phis which needed updated.<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - for (PHINode
&LCSSAPhi :
LoopExitBlock->phis())<br>
>>>> - if
(any_of(LCSSAPhi.incoming_values(),<br>
>>>> -
[Phi](Value *V) { return V == Phi;
}))<br>
>>>> -
LCSSAPhi.addIncoming(ExtractForPhiUsedOutsideLoop,<br>
>>>> LoopMiddleBlock);<br>
>>>> + // scalar
epilogue); in that case, the exiting
path through<br>
>>>> middle will be<br>
>>>> + // dynamically
dead and the value picked for the
phi doesn't<br>
>>>> matter.<br>
>>>> + for (PHINode
&LCSSAPhi :
LoopExitBlock->phis())<br>
>>>> + if
(any_of(LCSSAPhi.incoming_values(),<br>
>>>> +
[Phi](Value *V) { return V == Phi;
}))<br>
>>>> +
LCSSAPhi.addIncoming(ExtractForPhiUsedOutsideLoop,<br>
>>>> LoopMiddleBlock);<br>
>>>> }<br>
>>>><br>
>>>> void
InnerLoopVectorizer::fixReduction(PHINode
*Phi) {<br>
>>>> @@ -4421,11
+4386,10 @@ void<br>
>>>>
InnerLoopVectorizer::fixReduction(PHINode
*Phi) {<br>
>>>> // We know
that the loop is in LCSSA form. We
need to update<br>
>>>> the PHI nodes<br>
>>>> // in the exit
blocks. See comment on analogous
loop in<br>
>>>> //
fixFirstOrderRecurrence for a more
complete explaination of<br>
>>>> the logic.<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - for (PHINode
&LCSSAPhi :
LoopExitBlock->phis())<br>
>>>> - if
(any_of(LCSSAPhi.incoming_values(),<br>
>>>> -
[LoopExitInst](Value *V) { return V
==<br>
>>>> LoopExitInst; }))<br>
>>>> -
LCSSAPhi.addIncoming(ReducedPartRdx,
LoopMiddleBlock);<br>
>>>> + for (PHINode
&LCSSAPhi :
LoopExitBlock->phis())<br>
>>>> + if
(any_of(LCSSAPhi.incoming_values(),<br>
>>>> +
[LoopExitInst](Value *V) { return V
==<br>
>>>> LoopExitInst; }))<br>
>>>> +
LCSSAPhi.addIncoming(ReducedPartRdx,
LoopMiddleBlock);<br>
>>>><br>
>>>> // Fix the
scalar loop reduction variable with
the incoming<br>
>>>> reduction sum<br>
>>>> // from the
vector body and from the backedge
value.<br>
>>>> @@ -8074,11 +8038,7
@@ BasicBlock<br>
>>>>
*EpilogueVectorizerMainLoop::emitMinimumIterationCountCheck(<br>
>>>><br>
>>>> // Update
dominator for Bypass & LoopExit.<br>
>>>>
DT->changeImmediateDominator(Bypass,
TCCheckBlock);<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - // For loops
with multiple exits, there's no edge
from the<br>
>>>> middle block<br>
>>>> - // to exit
blocks (as the epilogue must run)
and thus no<br>
>>>> need to update<br>
>>>> - // the
immediate dominator of the exit
blocks.<br>
>>>> -
DT->changeImmediateDominator(LoopExitBlock,
TCCheckBlock);<br>
>>>> +
DT->changeImmediateDominator(LoopExitBlock,
TCCheckBlock);<br>
>>>><br>
>>>>
LoopBypassBlocks.push_back(TCCheckBlock);<br>
>>>><br>
>>>> @@ -8142,12 +8102,7
@@<br>
>>>>
EpilogueVectorizerEpilogueLoop::createEpilogueVectorizedLoopSkeleton()<br>
>>>> {<br>
>>>><br>
>>>>
DT->changeImmediateDominator(LoopScalarPreHeader,<br>
>>>>
EPI.EpilogueIterationCountCheck);<br>
>>>> - if
(!Cost->requiresScalarEpilogue())<br>
>>>> - // If there is
an epilogue which must run, there's
no edge<br>
>>>> from the<br>
>>>> - // middle
block to exit blocks and thus no
need to update the<br>
>>>> immediate<br>
>>>> - // dominator
of the exit blocks.<br>
>>>> -
DT->changeImmediateDominator(LoopExitBlock,<br>
>>>> -
EPI.EpilogueIterationCountCheck);<br>
>>>> +
DT->changeImmediateDominator(LoopExitBlock,<br>
>>>>
EPI.EpilogueIterationCountCheck);<br>
>>>><br>
>>>> // Keep track
of bypass blocks, as they feed start
values to<br>
>>>> the induction<br>
>>>> // phis in the
scalar loop preheader.<br>
>>>><br>
>>>> diff --git<br>
>>>>
a/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll<br>
>>>>
b/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll<br>
>>>> index
ec280bf5d5e4..7d4a3c5c9935 100644<br>
>>>> ---<br>
>>>>
a/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll<br>
>>>> +++<br>
>>>>
b/llvm/test/Transforms/LoopVectorize/first-order-recurrence-complex.ll<br>
>>>> @@ -471,9 +471,10
@@ define i16 @multiple_exit(i16*
%p, i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP15:%.*]] = icmp eq i32
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP15]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP6:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i32
[[TMP2]], [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
[[VECTOR_RECUR_EXTRACT:%.*]] =
extractelement<br>
>>>> <4 x i16>
[[WIDE_LOAD]], i32 3<br>
>>>> ; CHECK-NEXT:
[[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]]
=<br>
>>>> extractelement
<4 x i16> [[WIDE_LOAD]], i32 2<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label
[[IF_END:%.*]], label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[SCALAR_RECUR_INIT:%.*]] = phi i16
[ 0,<br>
>>>> [[ENTRY:%.*]] ], [
[[VECTOR_RECUR_EXTRACT]],
[[MIDDLE_BLOCK]] ]<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i32 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY]] ]<br>
>>>> @@ -485,14 +486,14
@@ define i16 @multiple_exit(i16*
%p, i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[B:%.*]] = getelementptr inbounds
i16, i16*<br>
>>>> [[P]], i64
[[IPROM]]<br>
>>>> ; CHECK-NEXT:
[[REC_NEXT]] = load i16, i16* [[B]],
align 2<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp slt i32 [[I]],
[[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>> [[IF_END:%.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label [[IF_END]]<br>
>>>> ; CHECK:
for.body:<br>
>>>> ; CHECK-NEXT:
store i16 [[SCALAR_RECUR]], i16*
[[B]], align 4<br>
>>>> ; CHECK-NEXT:
[[INC]] = add nsw i32 [[I]], 1<br>
>>>> ; CHECK-NEXT:
[[CMP2:%.*]] = icmp slt i32 [[I]],
2096<br>
>>>> ; CHECK-NEXT:
br i1 [[CMP2]], label [[FOR_COND]],
label<br>
>>>> [[IF_END]],
[[LOOP7:!llvm.loop !.*]]<br>
>>>> ; CHECK:
if.end:<br>
>>>> -; CHECK-NEXT:
[[REC_LCSSA:%.*]] = phi i16 [
[[SCALAR_RECUR]],<br>
>>>> [[FOR_BODY]] ], [
[[SCALAR_RECUR]], [[FOR_COND]] ]<br>
>>>> +; CHECK-NEXT:
[[REC_LCSSA:%.*]] = phi i16 [
[[SCALAR_RECUR]],<br>
>>>> [[FOR_BODY]] ], [
[[SCALAR_RECUR]], [[FOR_COND]] ], [<br>
>>>>
[[VECTOR_RECUR_EXTRACT_FOR_PHI]],
[[MIDDLE_BLOCK]] ]<br>
>>>> ; CHECK-NEXT:
ret i16 [[REC_LCSSA]]<br>
>>>> ;<br>
>>>> entry:<br>
>>>> @@ -557,9 +558,10
@@ define i16 @multiple_exit2(i16*
%p, i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP15:%.*]] = icmp eq i32
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP15]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP8:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i32
[[TMP2]], [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
[[VECTOR_RECUR_EXTRACT:%.*]] =
extractelement<br>
>>>> <4 x i16>
[[WIDE_LOAD]], i32 3<br>
>>>> ; CHECK-NEXT:
[[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]]
=<br>
>>>> extractelement
<4 x i16> [[WIDE_LOAD]], i32 2<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label
[[IF_END:%.*]], label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[SCALAR_RECUR_INIT:%.*]] = phi i16
[ 0,<br>
>>>> [[ENTRY:%.*]] ], [
[[VECTOR_RECUR_EXTRACT]],
[[MIDDLE_BLOCK]] ]<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i32 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY]] ]<br>
>>>> @@ -571,14 +573,14
@@ define i16 @multiple_exit2(i16*
%p, i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[B:%.*]] = getelementptr inbounds
i16, i16*<br>
>>>> [[P]], i64
[[IPROM]]<br>
>>>> ; CHECK-NEXT:
[[REC_NEXT]] = load i16, i16* [[B]],
align 2<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp slt i32 [[I]],
[[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>> [[IF_END:%.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label [[IF_END]]<br>
>>>> ; CHECK:
for.body:<br>
>>>> ; CHECK-NEXT:
store i16 [[SCALAR_RECUR]], i16*
[[B]], align 4<br>
>>>> ; CHECK-NEXT:
[[INC]] = add nsw i32 [[I]], 1<br>
>>>> ; CHECK-NEXT:
[[CMP2:%.*]] = icmp slt i32 [[I]],
2096<br>
>>>> ; CHECK-NEXT:
br i1 [[CMP2]], label [[FOR_COND]],
label<br>
>>>> [[IF_END]],
[[LOOP9:!llvm.loop !.*]]<br>
>>>> ; CHECK:
if.end:<br>
>>>> -; CHECK-NEXT:
[[REC_LCSSA:%.*]] = phi i16 [
[[SCALAR_RECUR]],<br>
>>>> [[FOR_COND]] ], [
10, [[FOR_BODY]] ]<br>
>>>> +; CHECK-NEXT:
[[REC_LCSSA:%.*]] = phi i16 [
[[SCALAR_RECUR]],<br>
>>>> [[FOR_COND]] ], [
10, [[FOR_BODY]] ], [<br>
>>>>
[[VECTOR_RECUR_EXTRACT_FOR_PHI]],
[[MIDDLE_BLOCK]] ]<br>
>>>> ; CHECK-NEXT:
ret i16 [[REC_LCSSA]]<br>
>>>> ;<br>
>>>> entry:<br>
>>>><br>
>>>> diff --git<br>
>>>>
a/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll<br>
>>>>
b/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll<br>
>>>> index
f0ba677348ab..0d4bdf0ecac3 100644<br>
>>>> ---
a/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll<br>
>>>> +++
b/llvm/test/Transforms/LoopVectorize/interleaved-accesses.ll<br>
>>>> @@ -447,7 +447,7 @@
define void
@even_load_static_tc(i32* noalias<br>
>>>> nocapture readonly
%A, i32* noalia<br>
>>>> ; CHECK-NEXT:
[[TMP6:%.*]] = icmp eq i64
[[INDEX_NEXT]], 508<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP6]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP12:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 false, label
[[FOR_COND_CLEANUP:%.*]],<br>
>>>> label [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
1016,<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_BODY:%.*]]<br>
>>>> @@ -463,7 +463,7 @@
define void
@even_load_static_tc(i32* noalias<br>
>>>> nocapture readonly
%A, i32* noalia<br>
>>>> ; CHECK-NEXT:
store i32 [[MUL]], i32*
[[ARRAYIDX2]], align 4<br>
>>>> ; CHECK-NEXT:
[[INDVARS_IV_NEXT]] = add nuw nsw
i64<br>
>>>> [[INDVARS_IV]], 2<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp ult i64
[[INDVARS_IV]], 1022<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>>
[[FOR_COND_CLEANUP:%.*]],
[[LOOP13:!llvm.loop !.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>>
[[FOR_COND_CLEANUP]],
[[LOOP13:!llvm.loop !.*]]<br>
>>>> ;<br>
>>>> entry:<br>
>>>> br label
%for.body<br>
>>>> @@ -528,7 +528,7 @@
define void
@even_load_dynamic_tc(i32* noalias<br>
>>>> nocapture readonly
%A, i32* noali<br>
>>>> ; CHECK-NEXT:
[[TMP12:%.*]] = icmp eq i64
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP12]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP14:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 false, label
[[FOR_COND_CLEANUP:%.*]],<br>
>>>> label [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
[[IND_END]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_BODY:%.*]]<br>
>>>> @@ -544,7 +544,7 @@
define void
@even_load_dynamic_tc(i32* noalias<br>
>>>> nocapture readonly
%A, i32* noali<br>
>>>> ; CHECK-NEXT:
store i32 [[MUL]], i32*
[[ARRAYIDX2]], align 4<br>
>>>> ; CHECK-NEXT:
[[INDVARS_IV_NEXT]] = add nuw nsw
i64<br>
>>>> [[INDVARS_IV]], 2<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp ult i64
[[INDVARS_IV_NEXT]],<br>
>>>> [[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>>
[[FOR_COND_CLEANUP:%.*]],
[[LOOP15:!llvm.loop !.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>>
[[FOR_COND_CLEANUP]],
[[LOOP15:!llvm.loop !.*]]<br>
>>>> ;<br>
>>>> entry:<br>
>>>> br label
%for.body<br>
>>>> @@ -973,7 +973,7 @@
define void @PR27626_0(%pair.i32
*%p, i32 %z,<br>
>>>> i64 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP19:%.*]] = icmp eq i64
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP19]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP24:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 false, label [[FOR_END:%.*]],
label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_BODY:%.*]]<br>
>>>> @@ -985,7 +985,7 @@
define void @PR27626_0(%pair.i32
*%p, i32 %z,<br>
>>>> i64 %n) {<br>
>>>> ; CHECK-NEXT:
store i32 [[Z]], i32* [[P_I_Y]],
align 4<br>
>>>> ; CHECK-NEXT:
[[I_NEXT]] = add nuw nsw i64 [[I]],
1<br>
>>>> ; CHECK-NEXT:
[[COND:%.*]] = icmp slt i64
[[I_NEXT]], [[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END:%.*]],
[[LOOP25:!llvm.loop !.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END]],
[[LOOP25:!llvm.loop !.*]]<br>
>>>> ; CHECK:
for.end:<br>
>>>> ; CHECK-NEXT:
ret void<br>
>>>> ;<br>
>>>> @@ -1066,7 +1066,7
@@ define i32 @PR27626_1(%pair.i32
*%p, i64 %n) {<br>
>>>> ; CHECK-NEXT:
[[RDX_SHUF3:%.*]] = shufflevector
<4 x i32><br>
>>>> [[BIN_RDX]], <4
x i32> poison, <4 x i32>
<i32 1, i32 undef, i32<br>
>>>> undef, i32
undef><br>
>>>> ; CHECK-NEXT:
[[BIN_RDX4:%.*]] = add <4 x
i32> [[BIN_RDX]],<br>
>>>> [[RDX_SHUF3]]<br>
>>>> ; CHECK-NEXT:
[[TMP19:%.*]] = extractelement <4
x i32><br>
>>>> [[BIN_RDX4]], i32 0<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 false, label [[FOR_END:%.*]],
label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
[[BC_MERGE_RDX:%.*]] = phi i32 [
[[TMP19]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY]] ]<br>
>>>> @@ -1081,9 +1081,10
@@ define i32 @PR27626_1(%pair.i32
*%p, i64 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP21]] = add nsw i32 [[TMP20]],
[[S]]<br>
>>>> ; CHECK-NEXT:
[[I_NEXT]] = add nuw nsw i64 [[I]],
1<br>
>>>> ; CHECK-NEXT:
[[COND:%.*]] = icmp slt i64
[[I_NEXT]], [[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END:%.*]],
[[LOOP27:!llvm.loop !.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END]],
[[LOOP27:!llvm.loop !.*]]<br>
>>>> ; CHECK:
for.end:<br>
>>>> -; CHECK-NEXT:
ret i32 [[TMP21]]<br>
>>>> +; CHECK-NEXT:
[[TMP22:%.*]] = phi i32 [ [[TMP21]],
[[FOR_BODY]]<br>
>>>> ], [ [[TMP19]],
[[MIDDLE_BLOCK]] ]<br>
>>>> +; CHECK-NEXT:
ret i32 [[TMP22]]<br>
>>>> ;<br>
>>>> entry:<br>
>>>> br label
%for.body<br>
>>>> @@ -1162,7 +1163,7
@@ define void @PR27626_2(%pair.i32
*%p, i64 %n,<br>
>>>> i32 %z) {<br>
>>>> ; CHECK-NEXT:
[[TMP20:%.*]] = icmp eq i64
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP20]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP28:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 false, label [[FOR_END:%.*]],
label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_BODY:%.*]]<br>
>>>> @@ -1176,7 +1177,7
@@ define void @PR27626_2(%pair.i32
*%p, i64 %n,<br>
>>>> i32 %z) {<br>
>>>> ; CHECK-NEXT:
store i32 [[TMP21]], i32* [[P_I_Y]],
align 4<br>
>>>> ; CHECK-NEXT:
[[I_NEXT]] = add nuw nsw i64 [[I]],
1<br>
>>>> ; CHECK-NEXT:
[[COND:%.*]] = icmp slt i64
[[I_NEXT]], [[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END:%.*]],
[[LOOP29:!llvm.loop !.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END]],
[[LOOP29:!llvm.loop !.*]]<br>
>>>> ; CHECK:
for.end:<br>
>>>> ; CHECK-NEXT:
ret void<br>
>>>> ;<br>
>>>> @@ -1263,7 +1264,7
@@ define i32 @PR27626_3(%pair.i32
*%p, i64 %n,<br>
>>>> i32 %z) {<br>
>>>> ; CHECK-NEXT:
[[RDX_SHUF3:%.*]] = shufflevector
<4 x i32><br>
>>>> [[BIN_RDX]], <4
x i32> poison, <4 x i32>
<i32 1, i32 undef, i32<br>
>>>> undef, i32
undef><br>
>>>> ; CHECK-NEXT:
[[BIN_RDX4:%.*]] = add <4 x
i32> [[BIN_RDX]],<br>
>>>> [[RDX_SHUF3]]<br>
>>>> ; CHECK-NEXT:
[[TMP22:%.*]] = extractelement <4
x i32><br>
>>>> [[BIN_RDX4]], i32 0<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
br i1 false, label [[FOR_END:%.*]],
label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
[[BC_MERGE_RDX:%.*]] = phi i32 [
[[TMP22]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY]] ]<br>
>>>> @@ -1281,9 +1282,10
@@ define i32 @PR27626_3(%pair.i32
*%p, i64 %n,<br>
>>>> i32 %z) {<br>
>>>> ; CHECK-NEXT:
[[TMP25]] = add nsw i32 [[TMP24]],
[[S]]<br>
>>>> ; CHECK-NEXT:
[[I_NEXT]] = add nuw nsw i64 [[I]],
1<br>
>>>> ; CHECK-NEXT:
[[COND:%.*]] = icmp slt i64
[[I_NEXT]], [[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END:%.*]],
[[LOOP31:!llvm.loop !.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[COND]], label [[FOR_BODY]],
label<br>
>>>> [[FOR_END]],
[[LOOP31:!llvm.loop !.*]]<br>
>>>> ; CHECK:
for.end:<br>
>>>> -; CHECK-NEXT:
ret i32 [[TMP25]]<br>
>>>> +; CHECK-NEXT:
[[TMP26:%.*]] = phi i32 [ [[TMP25]],
[[FOR_BODY]]<br>
>>>> ], [ [[TMP22]],
[[MIDDLE_BLOCK]] ]<br>
>>>> +; CHECK-NEXT:
ret i32 [[TMP26]]<br>
>>>> ;<br>
>>>> entry:<br>
>>>> br label
%for.body<br>
>>>><br>
>>>> diff --git
a/llvm/test/Transforms/LoopVectorize/loop-form.ll<br>
>>>>
b/llvm/test/Transforms/LoopVectorize/loop-form.ll<br>
>>>> index
f32002fae2b6..91780789088b 100644<br>
>>>> ---
a/llvm/test/Transforms/LoopVectorize/loop-form.ll<br>
>>>> +++
b/llvm/test/Transforms/LoopVectorize/loop-form.ll<br>
>>>> @@ -146,14 +146,15
@@ define void @early_exit(i16* %p,
i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP10:%.*]] = icmp eq i32
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP10]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP4:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i32
[[TMP1]], [[N_VEC]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label
[[IF_END:%.*]], label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i32 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_COND:%.*]]<br>
>>>> ; CHECK:
for.cond:<br>
>>>> ; CHECK-NEXT:
[[I:%.*]] = phi i32 [
[[BC_RESUME_VAL]],<br>
>>>> [[SCALAR_PH]] ], [
[[INC:%.*]], [[FOR_BODY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp slt i32 [[I]],
[[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>> [[IF_END:%.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label [[IF_END]]<br>
>>>> ; CHECK:
for.body:<br>
>>>> ; CHECK-NEXT:
[[IPROM:%.*]] = sext i32 [[I]] to
i64<br>
>>>> ; CHECK-NEXT:
[[B:%.*]] = getelementptr inbounds
i16, i16*<br>
>>>> [[P]], i64
[[IPROM]]<br>
>>>> @@ -285,14 +286,15
@@ define void
@multiple_unique_exit(i16* %p,<br>
>>>> i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP11:%.*]] = icmp eq i32
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP11]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP6:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i32
[[TMP2]], [[N_VEC]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label
[[IF_END:%.*]], label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i32 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_COND:%.*]]<br>
>>>> ; CHECK:
for.cond:<br>
>>>> ; CHECK-NEXT:
[[I:%.*]] = phi i32 [
[[BC_RESUME_VAL]],<br>
>>>> [[SCALAR_PH]] ], [
[[INC:%.*]], [[FOR_BODY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp slt i32 [[I]],
[[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>> [[IF_END:%.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label [[IF_END]]<br>
>>>> ; CHECK:
for.body:<br>
>>>> ; CHECK-NEXT:
[[IPROM:%.*]] = sext i32 [[I]] to
i64<br>
>>>> ; CHECK-NEXT:
[[B:%.*]] = getelementptr inbounds
i16, i16*<br>
>>>> [[P]], i64
[[IPROM]]<br>
>>>> @@ -372,14 +374,17
@@ define i32
@multiple_unique_exit2(i16* %p,<br>
>>>> i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP11:%.*]] = icmp eq i32
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP11]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP8:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i32
[[TMP2]], [[N_VEC]]<br>
>>>> +; CHECK-NEXT:
[[IND_ESCAPE:%.*]] = sub i32
[[N_VEC]], 1<br>
>>>> +; CHECK-NEXT:
[[IND_ESCAPE1:%.*]] = sub i32
[[N_VEC]], 1<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label
[[IF_END:%.*]], label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i32 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_COND:%.*]]<br>
>>>> ; CHECK:
for.cond:<br>
>>>> ; CHECK-NEXT:
[[I:%.*]] = phi i32 [
[[BC_RESUME_VAL]],<br>
>>>> [[SCALAR_PH]] ], [
[[INC:%.*]], [[FOR_BODY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp slt i32 [[I]],
[[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>> [[IF_END:%.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label [[IF_END]]<br>
>>>> ; CHECK:
for.body:<br>
>>>> ; CHECK-NEXT:
[[IPROM:%.*]] = sext i32 [[I]] to
i64<br>
>>>> ; CHECK-NEXT:
[[B:%.*]] = getelementptr inbounds
i16, i16*<br>
>>>> [[P]], i64
[[IPROM]]<br>
>>>> @@ -388,7 +393,7 @@
define i32
@multiple_unique_exit2(i16* %p, i32<br>
>>>> %n) {<br>
>>>> ; CHECK-NEXT:
[[CMP2:%.*]] = icmp slt i32 [[I]],
2096<br>
>>>> ; CHECK-NEXT:
br i1 [[CMP2]], label [[FOR_COND]],
label<br>
>>>> [[IF_END]],
[[LOOP9:!llvm.loop !.*]]<br>
>>>> ; CHECK:
if.end:<br>
>>>> -; CHECK-NEXT:
[[I_LCSSA:%.*]] = phi i32 [ [[I]],
[[FOR_BODY]]<br>
>>>> ], [ [[I]],
[[FOR_COND]] ]<br>
>>>> +; CHECK-NEXT:
[[I_LCSSA:%.*]] = phi i32 [ [[I]],
[[FOR_BODY]]<br>
>>>> ], [ [[I]],
[[FOR_COND]] ], [ [[IND_ESCAPE1]],
[[MIDDLE_BLOCK]] ]<br>
>>>> ; CHECK-NEXT:
ret i32 [[I_LCSSA]]<br>
>>>> ;<br>
>>>> ;
TAILFOLD-LABEL:
@multiple_unique_exit2(<br>
>>>> @@ -461,14 +466,15
@@ define i32
@multiple_unique_exit3(i16* %p,<br>
>>>> i32 %n) {<br>
>>>> ; CHECK-NEXT:
[[TMP11:%.*]] = icmp eq i32
[[INDEX_NEXT]],<br>
>>>> [[N_VEC]]<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP11]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP10:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i32
[[TMP2]], [[N_VEC]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label
[[IF_END:%.*]], label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i32 [
[[N_VEC]],<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[FOR_COND:%.*]]<br>
>>>> ; CHECK:
for.cond:<br>
>>>> ; CHECK-NEXT:
[[I:%.*]] = phi i32 [
[[BC_RESUME_VAL]],<br>
>>>> [[SCALAR_PH]] ], [
[[INC:%.*]], [[FOR_BODY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
[[CMP:%.*]] = icmp slt i32 [[I]],
[[N]]<br>
>>>> -; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label<br>
>>>> [[IF_END:%.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP]], label [[FOR_BODY]],
label [[IF_END]]<br>
>>>> ; CHECK:
for.body:<br>
>>>> ; CHECK-NEXT:
[[IPROM:%.*]] = sext i32 [[I]] to
i64<br>
>>>> ; CHECK-NEXT:
[[B:%.*]] = getelementptr inbounds
i16, i16*<br>
>>>> [[P]], i64
[[IPROM]]<br>
>>>> @@ -477,7 +483,7 @@
define i32
@multiple_unique_exit3(i16* %p, i32<br>
>>>> %n) {<br>
>>>> ; CHECK-NEXT:
[[CMP2:%.*]] = icmp slt i32 [[I]],
2096<br>
>>>> ; CHECK-NEXT:
br i1 [[CMP2]], label [[FOR_COND]],
label<br>
>>>> [[IF_END]],
[[LOOP11:!llvm.loop !.*]]<br>
>>>> ; CHECK:
if.end:<br>
>>>> -; CHECK-NEXT:
[[EXIT:%.*]] = phi i32 [ 0,
[[FOR_COND]] ], [ 1,<br>
>>>> [[FOR_BODY]] ]<br>
>>>> +; CHECK-NEXT:
[[EXIT:%.*]] = phi i32 [ 0,
[[FOR_COND]] ], [ 1,<br>
>>>> [[FOR_BODY]] ], [
0, [[MIDDLE_BLOCK]] ]<br>
>>>> ; CHECK-NEXT:
ret i32 [[EXIT]]<br>
>>>> ;<br>
>>>> ;
TAILFOLD-LABEL:
@multiple_unique_exit3(<br>
>>>> @@ -994,7 +1000,8
@@ define void
@scalar_predication(float* %addr) {<br>
>>>> ; CHECK-NEXT:
[[TMP10:%.*]] = icmp eq i64
[[INDEX_NEXT]], 200<br>
>>>> ; CHECK-NEXT:
br i1 [[TMP10]], label
[[MIDDLE_BLOCK:%.*]],<br>
>>>> label
[[VECTOR_BODY]], [[LOOP12:!llvm.loop
!.*]]<br>
>>>> ; CHECK:
middle.block:<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i64 201, 200<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label [[EXIT:%.*]],
label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
200,<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
br label [[LOOP_HEADER:%.*]]<br>
>>>> @@ -1002,7 +1009,7
@@ define void
@scalar_predication(float* %addr) {<br>
>>>> ; CHECK-NEXT:
[[IV:%.*]] = phi i64 [
[[BC_RESUME_VAL]],<br>
>>>> [[SCALAR_PH]] ], [
[[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]]
]<br>
>>>> ; CHECK-NEXT:
[[GEP:%.*]] = getelementptr float,
float*<br>
>>>> [[ADDR]], i64
[[IV]]<br>
>>>> ; CHECK-NEXT:
[[EXITCOND_NOT:%.*]] = icmp eq i64
[[IV]], 200<br>
>>>> -; CHECK-NEXT:
br i1 [[EXITCOND_NOT]], label
[[EXIT:%.*]], label<br>
>>>> [[LOOP_BODY:%.*]]<br>
>>>> +; CHECK-NEXT:
br i1 [[EXITCOND_NOT]], label
[[EXIT]], label<br>
>>>> [[LOOP_BODY:%.*]]<br>
>>>> ; CHECK:
loop.body:<br>
>>>> ; CHECK-NEXT:
[[TMP11:%.*]] = load float, float*
[[GEP]],<br>
>>>> align 4<br>
>>>> ; CHECK-NEXT:
[[PRED:%.*]] = fcmp oeq float
[[TMP11]],<br>
>>>> 0.000000e+00<br>
>>>> @@ -1088,7 +1095,8
@@ define i32 @me_reduction(i32*
%addr) {<br>
>>>> ; CHECK-NEXT:
[[RDX_SHUF:%.*]] = shufflevector
<2 x i32><br>
>>>> [[TMP5]], <2 x
i32> poison, <2 x i32>
<i32 1, i32 undef><br>
>>>> ; CHECK-NEXT:
[[BIN_RDX:%.*]] = add <2 x
i32> [[TMP5]],<br>
>>>> [[RDX_SHUF]]<br>
>>>> ; CHECK-NEXT:
[[TMP7:%.*]] = extractelement <2
x i32><br>
>>>> [[BIN_RDX]], i32 0<br>
>>>> -; CHECK-NEXT:
br label [[SCALAR_PH]]<br>
>>>> +; CHECK-NEXT:
[[CMP_N:%.*]] = icmp eq i64 201, 200<br>
>>>> +; CHECK-NEXT:
br i1 [[CMP_N]], label [[EXIT:%.*]],
label<br>
>>>> [[SCALAR_PH]]<br>
>>>> ; CHECK: <a
href="http://scalar.ph"
moz-do-not-send="true"
rel="noreferrer" target="_blank">scalar.ph</a>:<br>
>>>> ; CHECK-NEXT:
[[BC_RESUME_VAL:%.*]] = phi i64 [
200,<br>
>>>> [[MIDDLE_BLOCK]] ],
[ 0, [[ENTRY:%.*]] ]<br>
>>>> ; CHECK-NEXT:
[[BC_MERGE_RDX:%.*]] = phi i32 [ 0,
[[ENTRY]]<br>
>>>> ], [ [[TMP7]],
[[MIDDLE_BLOCK]] ]<br>
>>>> @@ -1098,7 +1106,7
@@ define i32 @me_reduction(i32*
%addr) {<br>
>>>> ; CHECK-NEXT:
[[ACCUM:%.*]] = phi i32 [
[[BC_MERGE_RDX]],<br>
>>>> [[SCALAR_PH]] ], [
[[ACCUM_NEXT:%.*]], [[LOOP_LATCH]] ]<br>
>>>> ; CHECK-NEXT:
[[GEP:%.*]] = getelementptr i32,
i32* [[ADDR]],<br>
>>>> i64 [[IV]]<br>
>>>> ; CHECK-NEXT:
[[EXITCOND_NOT:%.*]] = icmp eq i64
[[IV]], 200<br>
>>>> -; CHECK-NEXT:
br i1 [[EXITCOND_NOT]], label
[[EXIT:%.*]], label<br>
>>>> [[LOOP_LATCH]]<br>
>>>> +; CHECK-NEXT:
br i1 [[EXITCOND_NOT]], label
[[EXIT]], label<br>
>>>> [[LOOP_LATCH]]<br>
>>>> ; CHECK:
loop.latch:<br>
>>>> ; CHECK-NEXT:
[[TMP8:%.*]] = load i32, i32*
[[GEP]], align 4<br>
>>>> ; CHECK-NEXT:
[[ACCUM_NEXT]] = add i32 [[ACCUM]],
[[TMP8]]<br>
>>>> @@ -1106,7 +1114,7
@@ define i32 @me_reduction(i32*
%addr) {<br>
>>>> ; CHECK-NEXT:
[[EXITCOND2_NOT:%.*]] = icmp eq i64
[[IV]], 400<br>
>>>> ; CHECK-NEXT:
br i1 [[EXITCOND2_NOT]], label
[[EXIT]], label<br>
>>>> [[LOOP_HEADER]],
[[LOOP15:!llvm.loop !.*]]<br>
>>>> ; CHECK:
exit:<br>
>>>> -; CHECK-NEXT:
[[LCSSA:%.*]] = phi i32 [ 0,
[[LOOP_HEADER]] ], [<br>
>>>> [[ACCUM_NEXT]],
[[LOOP_LATCH]] ]<br>
>>>> +; CHECK-NEXT:
[[LCSSA:%.*]] = phi i32 [ 0,
[[LOOP_HEADER]] ], [<br>
>>>> [[ACCUM_NEXT]],
[[LOOP_LATCH]] ], [ [[TMP7]],
[[MIDDLE_BLOCK]] ]<br>
>>>> ; CHECK-NEXT:
ret i32 [[LCSSA]]<br>
>>>> ;<br>
>>>> ;
TAILFOLD-LABEL: @me_reduction(<br>
>>>><br>
>>>><br>
>>>><br>
>>>>
_______________________________________________<br>
>>>> llvm-commits
mailing list<br>
>>>> <a
href="mailto:llvm-commits@lists.llvm.org"
moz-do-not-send="true"
target="_blank">llvm-commits@lists.llvm.org</a><br>
>>>> <a
href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits"
moz-do-not-send="true"
rel="noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits</a><br>
>>>
_______________________________________________<br>
>>> llvm-commits mailing
list<br>
>>> <a
href="mailto:llvm-commits@lists.llvm.org"
moz-do-not-send="true"
target="_blank">llvm-commits@lists.llvm.org</a><br>
>>> <a
href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits"
moz-do-not-send="true"
rel="noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits</a><br>
>
_______________________________________________<br>
> llvm-commits mailing list<br>
> <a
href="mailto:llvm-commits@lists.llvm.org"
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target="_blank">llvm-commits@lists.llvm.org</a><br>
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href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits"
moz-do-not-send="true"
rel="noreferrer" target="_blank">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits</a></blockquote>
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