[Bug c++/12902] Invalid assembly generated when using SSE / xmmintrin.h

["kbowers at lanl dot gov" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12902



------- Additional Comments From kbowers at lanl dot gov  2003-11-07 10:41 -------
I think I've found and fixed the bug. The bug appears to be the ambiguity issue
from my prior comment. I replaced the mov[h,l]p[s,d] instructions with more
appropriate versions as mentioned in my prior note. The attachments are the
diffs of the changes I made to i386.c and i386.md that allowed the original
program to compile properly:

$ gcc-3.3.2a -S -fverbose-asm -O -msse bug_12902.cpp
$ cat bug_12902.s
... snip ...
.L45:
        movaps  -40(%ebp), %xmm0        #  <variable>.v,  __A
        movl    8(%ebp), %eax   #  a
        movlps  (%eax), %xmm0   #  <anonymous>
        movaps  -200(%ebp), %xmm1
        movlps  8(%eax), %xmm1
        movhps  16(%eax), %xmm0 #  <anonymous>
        movhps  24(%eax), %xmm1
        movaps  %xmm1, -200(%ebp)

I don't know if the given diffs are the ideal way to make these modifications
but it seems to work. I learned the .md format about an hour ago by examining
other SSE instructions and so it is quite possible I've done it all wrong. To
the end, I am mildly concerned that load[h,l]p[s,d] need to be split like
sse_load_ss / sse_load_ss_1 to properly initialize some elements of the
vec_duplicate:V4SF.