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Commit 5d3fd3df authored by Craig Topper's avatar Craig Topper
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[RISCV] Make ctlz/cttz cheap to speculatively execute so CodeGenPrepare won't insert a zero check. 

Add additional isel patterns for ctzw/clzw instructions.

Differential Revision: https://reviews.llvm.org/D91040
parent a5907600
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