------- Additional Comments From guardia at sympatico dot ca 2005-01-24 18:09
-------
MMX intrinsics don't seem to be a standard (?), but I'm under the impression
that _mm_cvtsi32_si64 is supposed to generate MMX code. I just tested With (GCC)
4.0.0 20050123, and with -mmmx flag, the result is still the same, with the
-msse flag I now get :
movss 12(%ebp), %xmm0
movlps %xmm0, (%eax)
Which is correct, but what I'm trying to get is a MOVD so I don't have to fish
back into memory to use the integer I wanted to load in an mmx register.
Or is there another way to generate a MOVD?
Also, _mm_unpacklo_pi8 (check moo2.i) still generates superfluous movlps :
punpcklbw %mm0, %mm0
movl %esp, %ebp
subl $8, %esp
movl 8(%ebp), %eax
movq %mm0, -8(%ebp)
movlps -8(%ebp), %xmm1
movlps %xmm1, (%eax)
I guess any MMX intrinsics that makes use of the (__m64) cast conversion will
suffer from the same problem..... I think the fix to all these problems would be
to prevent the register allocator from using SSE registers when compiling MMX
intrinsics.. ?
--
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19530
