Thomas Lively f8c5a4c670 [WebAssembly] Optimize out shift masks ...

WebAssembly's shift instructions implicitly masks the shift count, so optimize
out redundant explicit masks of the shift count. For vector shifts, this
currently only works if the mask is applied before splatting the shift count,
but this should be addressed in a future commit. Resolves PR49655.

Differential Revision: https://reviews.llvm.org/D105600

2021-07-07 23:14:31 -07:00

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