[llvm-dev] Override TargetOptions for block of code?

[Hal Finkel via llvm-dev]

On 06/28/2017 01:48 PM, Jason wrote:
> Is there any way to provide the inverse? Ie, fast math enabled by 
> default, but disable rcp using the flags for a specific div?

No, but you can enable fast-math flags by default in the IRBuilder (by 
calling setFastMathFlags).

  -Hal

>
> On Wed, Jun 28, 2017 at 10:53 AM, Hal Finkel <hfinkel at anl.gov 
> <mailto:hfinkel at anl.gov>> wrote:
>
>     Hi, Jason,
>
>     You shouldn't need to use UsafeFPMath at all now. Instead, use
>     fast-math flags on the relevant instructions. See:
>     http://llvm.org/docs/LangRef.html#fast-math-flags
>     <http://llvm.org/docs/LangRef.html#fast-math-flags>
>
>      -Hal
>
>     On 06/28/2017 12:29 PM, Jason via llvm-dev wrote:
>>     Hi, we generally run our JIT with UnsafeFPMath enabled, but there
>>     are a few specific instances where a block of code needs to
>>     follow strict FPMath. Is there a way to temporarily override
>>     TargetOptions for a specific block of IR?
>>
>>
>>
>>
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>
>     -- 
>     Hal Finkel
>     Lead, Compiler Technology and Programming Languages
>     Leadership Computing Facility
>     Argonne National Laboratory
>
-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory
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