Guozhi Wei 9c916584ba [PPC] Avoid non-simple MVT in STBRX optimization ...

PR35402 triggered this case. It bswap and stores a 48bit value, current STBRX optimization transforms it into STBRX. Unfortunately 48bit is not a simple MVT, there is no PPC instruction to support it, and it can't be automatically expanded by llvm, so caused a crash.

This patch detects the non-simple MVT and returns early.

Differential Revision: https://reviews.llvm.org/D44500

llvm-svn: 327651

2018-03-15 17:49:12 +00:00

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