[Bug target/50766] New: Binutils 2.22.51 rejects bmi2 pext operation with memory operands

["lloyd at randombit dot net" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50766

             Bug #: 50766
           Summary: Binutils 2.22.51 rejects bmi2 pext operation with
                    memory operands
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: lloyd@randombit.net


This program

#include <stdio.h>
#include <x86intrin.h>

int main()
{
  unsigned int x = 0x23593464;
  unsigned int y = 0xF9494302;
  unsigned int z = _pext_u32(x, y);

  printf("%08X %08X %08X\n", x, y, z);
}

when compiled with gcc 4.7 without optimizations, produces a call to pext that
looks like this:

        pext    %eax, -16(%rbp), %eax

which binutils 2.22.51.20111017 rejects with

Error: operand size mismatch for `pext'

With -O2, gcc places all operands in registers, and as will accept it.

Version:

$ g++-4.7.0 -v 
Using built-in specs.
COLLECT_GCC=/usr/local/bin/g++-4.7.0
COLLECT_LTO_WRAPPER=/usr/local/gcc-4.7.0-r179617/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-svn/configure --program-suffix=-4.7.0-r179617
--prefix=/usr/local/gcc-4.7.0-r179617 --enable-languages=c,c++
Thread model: posix
gcc version 4.7.0 20111006 (experimental) (GCC) ) and using 

$ as --version
GNU assembler (GNU Binutils) 2.22.51.20111017
Copyright 2011 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `x86_64-unknown-linux-gnu'.