[LLVMbugs] [Bug 2566] Combine of bitcast and shuffle assumes vector to vector cast

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2566


Nicolas Capens <nicolas at capens.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |




--- Comment #9 from Nicolas Capens <nicolas at capens.net>  2008-07-24 16:52:36 ---
(In reply to comment #8)
> Patch committed.

Thanks!

> The assumption in getShuffleScalarElt is safe.

getShuffleScalarElt itself is indeed correct, however, PerformShuffleCombine in
X86ISelLowering incorrectly assumes it's dealing with a vector to vector
bitcast. So to clarify, I'm getting an assert with the following call stack:

assert
llvm::MVT::getVectorNumElements
llvm::SelectionDAG::getShuffleScalarElt
EltsFromConsecutiveLoads
PerformShuffleCombine
llvm::X86TargetLowering::PerformDAGCombine
...


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