Craig Topper b5fd6b46f5 [RISCV] Teach instruction selection to elide sext.w in some cases. ...

If a sext_inreg is up for isel, and all its users are W instructions,
we can skip emitting the sext_inreg. This helpful if the producing
instruction can't become a W instruction.

Reviewed By: asb

Differential Revision: https://reviews.llvm.org/D108966

2021-09-02 07:54:34 -07:00

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