[Bug target/18562] SSE constant vector initialization produces dead constant values on stack

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2005-01-11 23:58 -------
Your first test case is fixed by the patch for PR13366.  We now get

        .align 16
.LC0:
        .long   1067869798
        .long   1067869798
        .long   1067869798
        .long   1067869798
...
        movaps  .LC0, %xmm0
        movups  %xmm0, 56(%esp)

I really don't know what you expected out of your second test case.  Perhaps
the problem is that we don't expose what movups means to the compiler.  I can
see that perhaps we could reuse MISALIGNED_INDIRECT_REF to represent this
(which as a side benefit would result in movhps+movlps instead of one movups,
which runs faster).  But I doubt that we have the machinery at the tree level
to copy-propagate the aggregate initialization from val1[4] -> result[4].  I'm
pretty sure that we have open enhancement requests for this already.

So shall we mark this fixed?

-- 
           What    |Removed                     |Added
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             Status|NEW                         |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18562