[LLVMdev] SIMD trigonometry/logarithms?

[Dmitry Mikushin]

Hi Justin,

I think having .bc math libraries for different backends makes perfect
sense! For example, in case of NVPTX backend we have the following problem:
many math functions that are only available as CUDA C++ headers could not
be easily used in, for instance, GPU program written in Fortran. On our end
we are currently doing exactly what you proposed: generating math.bc module
and then link it at IR-level with the target application. There is no need
for SIMD, but having .bc math library would still be very important!

- D.

2013/1/27 Justin Holewinski <justin.holewinski at gmail.com>

> I'm wondering if it makes sense to instead supply a bc math library.  I
> would think it would be easier to maintain and debug, and should still give
> you all of the benefits.  You could just link with it early in the
> optimization pipeline to ensure inlining.  This may also make it easier to
> maintain SIMD functions for multiple backends.
>
>
> On Sun, Jan 27, 2013 at 8:49 AM, Hal Finkel <hfinkel at anl.gov> wrote:
>
>> ----- Original Message -----
>> > From: "Dimitri Tcaciuc" <dtcaciuc at gmail.com>
>> > To: llvmdev at cs.uiuc.edu
>> > Sent: Sunday, January 27, 2013 3:42:42 AM
>> > Subject: [LLVMdev] SIMD trigonometry/logarithms?
>> >
>> >
>> >
>> > Hi everyone,
>> >
>> >
>> > I was looking at loop vectorizer code and wondered if there was any
>> > current or planned effort to introduce SIMD implementations of
>> > sin/cos/exp/log intrinsics (in particular for x86-64 backend)?
>>
>> Ralf Karrenberg had implemented some of these as part of his
>> whole-function vectorization project:
>>
>> https://github.com/karrenberg/wfv/blob/master/src/utils/nativeSSEMathFunctions.hpp
>>
>> https://github.com/karrenberg/wfv/blob/master/src/utils/nativeAVXMathFunctions.hpp
>>
>> Opinions on pulling these into the X86 backend?
>>
>>  -Hal
>>
>> >
>> >
>> > Cheers,
>> >
>> >
>> >
>> >
>> > Dimitri.
>> > _______________________________________________
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>> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>> >
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>
>
>
> --
>
> Thanks,
>
> Justin Holewinski
>
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