Craig Topper a80352c04e [X86] When post-processing the DAG to remove zero extending moves for YMM/ZMM, make sure the producing instruction is VEX/XOP/EVEX encoded. ...

If the producing instruction is legacy encoded it doesn't implicitly zero the upper bits. This is important for the SHA instructions which don't have a VEX encoded version. We might also be able to hit this with the incomplete f128 support that hasn't been ported to VEX.

llvm-svn: 338812

2018-08-03 04:49:42 +00:00

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