Bug 11628

the x86 MOVD opcode is a way more efficient method of handling 32-bit movements 
to/from mmx registers than the 64-bit casts which are currently used... the 
patch below enables the use of MOVD through the _mm_cvtsi32_si64 and 
_mm_cvtsi64_si32 intrinsics.

a more ideal solution would be to handle the 64-bit casting using movd, but 
that's way beyond what i would know how to do to gcc :)

this is essentially a clone of the similar MOVD support for xmm registers.

-dean

here's an example comparing the old method (using casts) to the new method 
using the intrinsics i've added:

$ cat t32.c
#include <stdint.h>
#ifdef __INTEL_COMPILER
#include <emmintrin.h>
#else
#include <xmmintrin.h>
#endif

uint32_t old_64_to_32(__m64 m)
{
        return (unsigned long long)m;
}

uint32_t new_64_to_32(__m64 m)
{
        return _mm_cvtsi64_si32(m);
}

__m64 old_32_to_64(uint32_t a)
{
        long long tmp = (unsigned int)a;
        return (__m64)tmp;
}

__m64 new_32_to_64(uint32_t a)
{
        return _mm_cvtsi32_si64(a);
}

$ ~/gcc/bin/gcc -O -march=pentium4 -fomit-frame-pointer -c t32.c
$ objdump -dr t32.o

t32.o:     file format elf32-i386

Disassembly of section .text:

00000000 <old_64_to_32>:
   0:   83 ec 0c                sub    $0xc,%esp
   3:   0f 6f 44 24 10          movq   0x10(%esp,1),%mm0
   8:   0f 7f 04 24             movq   %mm0,(%esp,1)
   c:   8b 04 24                mov    (%esp,1),%eax
   f:   83 c4 0c                add    $0xc,%esp
  12:   c3                      ret

00000013 <new_64_to_32>:
  13:   0f 6f 44 24 04          movq   0x4(%esp,1),%mm0
  18:   0f 7e c0                movd   %mm0,%eax
  1b:   c3                      ret

0000001c <old_32_to_64>:
  1c:   83 ec 0c                sub    $0xc,%esp
  1f:   8b 44 24 10             mov    0x10(%esp,1),%eax
  23:   8b 54 24 14             mov    0x14(%esp,1),%edx
  27:   b9 00 00 00 00          mov    $0x0,%ecx
  2c:   89 14 24                mov    %edx,(%esp,1)
  2f:   89 4c 24 04             mov    %ecx,0x4(%esp,1)
  33:   0f 6f 04 24             movq   (%esp,1),%mm0
  37:   0f 7f 00                movq   %mm0,(%eax)
  3a:   83 c4 0c                add    $0xc,%esp
  3d:   c2 04 00                ret    $0x4

00000040 <new_32_to_64>:
  40:   8b 44 24 04             mov    0x4(%esp,1),%eax
  44:   0f 6e 44 24 08          movd   0x8(%esp,1),%mm0
  49:   0f 7f 00                movq   %mm0,(%eax)
  4c:   c2 04 00                ret    $0x4

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`
end