[Bug target/57624] New: BZHI instrinsic is missing

[Bug target/57624] New: BZHI instrinsic is missing

[sgunderson at bigfoot dot com]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57624

            Bug ID: 57624
           Summary: BZHI instrinsic is missing
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sgunderson at bigfoot dot com

Hi,

The GCC documentation
(http://gcc.gnu.org/onlinedocs/gcc/X86-Built_002din-Functions.html) claims
there should be such an intrinsic, added in gcc 4.7:

     unsigned long long _bzhi_u64 (unsigned long long, unsigned long long)

Yet, with gcc 4.8.1 (Debian 4.8.1-2), nothing of the sort exists:

sesse@gruessi:~$ gcc-4.8 -Wall -O2 -mbmi2 -c bzhi-test.c
bzhi-test.c: In function ‘func’:
bzhi-test.c:5:2: warning: implicit declaration of function ‘_bzhi_u64’
[-Wimplicit-function-declaration]
  return _bzhi_u64(x, y);
  ^

A function call is generated instead, which was obviously not what I intended.
:-)

I thought this was maybe just a documentation error, but
__builtin_ia32_bzhi_u64 also does not exist.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug preprocessor/57620] Phantom terminator confuses raw string literal parsing.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idW620

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 30306
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id0306&actioníit
gcc49-pr57620.patch

So far only very lightly tested patch, passes raw-string* tests (except for
raw-string-2.c which contains also trigraph tests that were valid in the
earlier raw string paper, but aren't valid in C++11) and this plus a few other
tests.
Will still need to adjust raw-string-2.c, and add sufficient test coverage for
all the corner cases.

[Bug target/57624] BZHI instrinsic is missing

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57624

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If you forget to include
#include <x86intrin.h>
then don't be surprised.

[Bug target/57624] BZHI instrinsic is missing

[sgunderson at bigfoot dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57624

--- Comment #2 from sgunderson at bigfoot dot com ---
Shouldn't really the documentation say so, then? The entire GCC manual seems to
make no note of this header at all, as far as I can see.