[LLVMdev] SIMD trigonometry/logarithms?

[Hal Finkel]

----- Original Message -----
> From: "Dmitry Mikushin" <dmitry at kernelgen.org>
> To: "Justin Holewinski" <justin.holewinski at gmail.com>
> Cc: "Hal Finkel" <hfinkel at anl.gov>, "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Sent: Sunday, January 27, 2013 10:19:42 AM
> Subject: Re: [LLVMdev] SIMD trigonometry/logarithms?
> 
> 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!

I agree. I think that, essentially, all we need is some infrastructure for finding standard bc/ll include files (much like clang can add its own internal include directory).

 -Hal

> 
> - 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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> 
> 
> --
> 
> 
> Thanks,
> 
> 
> Justin Holewinski
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