[PATCH] Flag to enable IEEE-754 friendly FP optimizations

[Mehdi Amini via llvm-commits]

Ping?

— 
Mehdi

> On Jan 4, 2016, at 6:28 PM, Mehdi Amini via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> Hi Sergey,
> 
> Where are we standing with respect to this work? 
> 
> I think that: 
> 
> - http://reviews.llvm.org/D14073 needs a small update (and a question does not have an answer)
> - http://reviews.llvm.org/D14077 can be abandoned?
> - http://reviews.llvm.org/D14079 I am currently reviewing this
> 
> I have some recollection that you said last months that you may stop working on this, do you know when? I’d really like that we get this through :)
> 
> Also, I guess we need to expose some command line options to clang, right? Do you already have a patch for the clang side? (I don’t remember seeing it)
> 
> Thanks,
> 
> Mehdi
> 
>> On Oct 1, 2015, at 6:14 AM, Sergey Dmitrouk <sdmitrouk at accesssoftek.com> wrote:
>> 
>> Hello Hal,
>> 
>> On Tue, Sep 29, 2015 at 03:18:46PM -0700, Hal Finkel wrote:
>>>>> Did this stuff ever land?
>>>> 
>>>> No, it was relatively close, but an issue with reordering became
>>>> visible and changed the disposition.
>>> 
>>> Is there a reason that we should not land the constant-folding patches
>>> first, and then move on to the problems of preventing reordering?
>> 
>> Not really, I'll be happy to land the constant-folding part.  Attached
>> rebased and updated version, assuming we don't need Phabricator for
>> this round.  Main changes are use of FastMathFlags in arguments, comment and
>> IRBuilder updates, also removed accidental changes for Mul (not FMul).
>> 
>>>> That reordering issue is quite hard to address, the latest update I
>>>> sent is here:
>>>> 
>>>> http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20150914/299491.html
>>> 
>>> Looks like you're waiting for a reply from me on this; I'll do that...
>> 
>> Thanks, I actually do have new instructions now (FADD_W_CHAIN, etc.),
>> had to add them to work around conflicts.  TableGen definitions use node
>> types for selection and using the same node more than once (to provide
>> versions with and without side effects) causes conflicts.
>> 
>> Regards,
>> Sergey
>> <0001-Add-flags-and-command-line-switches-for-FPEnv.patch><0002-Add-FPEnv-access-flags-to-fast-math-flags.patch><0003-Consider-FPEnv-access-in-SelectionDAG.patch><0004-Skip-constant-folding-to-preserve-FPEnv.patch><0005-Teach-IR-builder-and-folders-about-new-flags.patch><0006-Do-not-fold-constants-on-reading-in-IR-asm-bitcode.patch><0007-Prevent-undesired-folding-by-InstSimplify.patch><0008-Do-not-simplify-expressions-with-FPEnv-access.patch><0009-Make-Strict-flag-available-for-more-clients.patch><0010-Use-Strict-in-IRBuilder.patch><0011-Don-t-convert-fpops-to-constexprs-in-SCCP.patch><0012-Prevent-InstCombine-from-hanging.patch><0013-Don-t-hoist-FP-ops-with-side-effects-in-LICM.patch>
> 
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