[Bug c/58889] New: GCC 4.9 fails to compile certain functions with intrinsics with __attribute__((target))

[Bug c/58889] New: GCC 4.9 fails to compile certain functions with intrinsics with __attribute__((target))

[thiago at kde dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58889

            Bug ID: 58889
           Summary: GCC 4.9 fails to compile certain functions with
                    intrinsics with __attribute__((target))
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thiago at kde dot org

Source:

$ cat t.c
#include <immintrin.h>
__attribute__((target("avx2"))) int f(void *ptr)
{ 
  return _mm256_movemask_epi8(_mm256_loadu_si256((__m256i*)ptr)); 
}

Works:

$ ~/gcc4.9/bin/g++ -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -m32 -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -march=core2 -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -march=core2 -m32 -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -march=nocona -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -march=nocona -m32 -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -march=prescott -m32 -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -march=pentium4 -m32 -S -O3 -o /dev/null t.c
$ ~/gcc4.9/bin/g++ -march=pentium3 -m32 -S -O3 -o /dev/null t.c

Fails:
$ ~/gcc4.9/bin/g++ -march=pentium2 -m32 -S -O3 -o /dev/null t.c
avxintrin.h: In function ‘int f(void*)’:
avxintrin.h:890:1: error: inlining failed in call to always_inline ‘__m256i
_mm256_loadu_si256(const __m256i*)’: target specific option mismatch
 _mm256_loadu_si256 (__m256i const *__P)
 ^
[...]
g++: internal compiler error: Segmentation fault (program cc1plus)
0x409614 execute
        /home/thiago/src/gcc/gcc/gcc.c:2864


$ ~/gcc4.9/bin/g++ -march=pentium -m32 -S -O3 -o /dev/null t.c
avxintrin.h: In function ‘int f(void*)’:
avxintrin.h:890:1: error: inlining failed in call to always_inline ‘__m256i
_mm256_loadu_si256(const __m256i*)’: target specific option mismatch
 _mm256_loadu_si256 (__m256i const *__P)
 ^
[...]
[no segfault]

This is an unpatched, pristine GCC, built from trunk@203862.
System: Linux 64-bit (Fedora 17)
Configure options: --enable-lang=c,c++
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From: "thiago at kde dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/58889] GCC 4.9 fails to compile certain functions with intrinsics with __attribute__((target))
Date: Sat, 26 Oct 2013 18:31:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX889

--- Comment #1 from Thiago Macieira <thiago at kde dot org> ---
This problem also happens with other combinations of functions in use and
compiler options.

My original problem happened on a 64-bit build with -march=corei7-avx and a
function with __attribute__((target("avx2"))).

[Bug target/58889] GCC 4.9 fails to compile certain functions with intrinsics with __attribute__((target))

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58889

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |i?86-*-*
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-10-29
                 CC|                            |hubicka at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with -O -m32.  AVX2 is new in 4.9, can you build a testcase
with AVX to see whether 4.8 works?

I suspect we hit

      else if (caller_opts->x_ix86_fpmath != callee_opts->x_ix86_fpmath)
        ret = false;

after Honzas patch?

[Bug target/58889] GCC 4.9 fails to compile certain functions with intrinsics with __attribute__((target))

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58889

--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> ---
It seems to be fixed in GCC.4.9.0
https://godbolt.org/z/MbqPzeTEP