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

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-14 06:51 -------
Hmm, but vectors are not consider as aggregates.
at the tree level right before optimization, we have:
  A_6 = {1.2999999523162841796875e+0, 1.2999999523162841796875e+0, 
1.2999999523162841796875e+0, 1.2999999523162841796875e+0};
  #   result_26 = V_MAY_DEF <result_14>;
  __builtin_ia32_storeups (&result, A_6);

I would have thought that VECTOR_CST would be considered a constant and propgrated into 
__builtin_ia32_storeups and that we would have folded __builtin_ia32_storeups at the tree level.

So I think there are two issues now, the first is that we don't constant prop VECTOR_CST (if this is truely 
a VECTOR_CST in store_ccp):
A_6 = {1.2999999523162841796875e+0, 1.2999999523162841796875e+0, 
1.2999999523162841796875e+0, 1.2999999523162841796875e+0};

Lattice value changed to VARYING.  Adding SSA edges to worklist.


And then we need a fold specific to x86 for __builtin_ia32_storeups, after that it should just work.

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