llvm dev - Jan 2009 - [LLVMdev] Optimized code analysis problems

Hi all,
I am trying to do an analysis of a parallelized code using sse
optimizations. The problem I am encountering is that I need to do some
matching based on the analysis and I would like to extract the names of the
functions as is rather than llvm intrinsics with an llvm. representation.
Essentially I would like to extract the control flow graph representation
with function names (eg. _mm_cvtsi32_si128) instead of the functions being
replaced by 'llvm.*'

Is there anyway to extract these names directly as function calls?


I have included the sample code below.

I get the function call names as llvm.x86 something instead of getting
function names(eg. _mm_cvtsi32_si128)

#include <pmmintrin.h>

#include<sys/time.h>

#include<iostream>



void foo_opt(unsigned char output[64], int Yc[64], int S_BITS)

{

    __m128i XMM1, XMM2, XMM3, XMM4;

    __m128i *xmm1 = (__m128i*)Yc;

    __m128i XMM5 = _mm_cvtsi32_si128(S_BITS + 3) ;

    XMM2 = _mm_set1_epi32(S_BITS + 2);

    for (int l = 0; l < 8; l++) {

        XMM1 = _mm_loadu_si128(xmm1++);

        XMM3 = _mm_add_epi32(XMM1, XMM2);

        XMM1 = _mm_cmplt_epi32(XMM1, _mm_setzero_si128());

        XMM1 = _mm_srli_epi32(XMM1, 31);

        XMM3 = _mm_sub_epi32(XMM3, XMM1);

        XMM3 = _mm_srl_epi32(XMM3, XMM5);



        XMM1 = _mm_loadu_si128(xmm1++);

        XMM4 = _mm_add_epi32(XMM1, XMM2);

        XMM1 = _mm_cmplt_epi32(XMM1, _mm_setzero_si128());

        XMM1 = _mm_srli_epi32(XMM1, 31);

        XMM4 = _mm_sub_epi32(XMM4, XMM1);

        XMM4 = _mm_srl_epi32(XMM4, XMM5);



        XMM3 = _mm_packs_epi32(XMM3, XMM4);

        XMM3 = _mm_packus_epi16(XMM3, XMM3);

        _mm_storel_epi64((__m128i*)(output+8*l), XMM3);

    }

}
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On Fri, Jan 30, 2009 at 7:10 PM, Nipun Arora <nipun2512 at gmail.com>
wrote:
> Essentially I would like to extract the control flow graph representation
> with function names (eg. _mm_cvtsi32_si128) instead of the functions being
> replaced by 'llvm.*'
> Is there anyway to extract these names directly as function calls?
The names disappear in an unrecoverable way once the first inlining
pass runs to take care of always_inline.  You might be able to hack
the code to sneak in before then, though.

-Eli

Hii,

Thanks for the response, yes I couldn't find any way to extract the names
through any of the passes.
Where could I potentially insert a hack so that any function call to
intrinsic functions or library functions can be retrieved?
Could you gimme any ideas for the start?

-Nipun

On Fri, Jan 30, 2009 at 10:39 PM, Eli Friedman <eli.friedman at
gmail.com>wrote:
> On Fri, Jan 30, 2009 at 7:10 PM, Nipun Arora <nipun2512 at gmail.com>
wrote:
> > Essentially I would like to extract the control flow graph
representation
> > with function names (eg. _mm_cvtsi32_si128) instead of the functions
> being
> > replaced by 'llvm.*'
> > Is there anyway to extract these names directly as function calls?
>
> The names disappear in an unrecoverable way once the first inlining
> pass runs to take care of always_inline.  You might be able to hack
> the code to sneak in before then, though.
>
> -Eli
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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