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Commit cb82de29 authored by Ben Shi's avatar Ben Shi Committed by Fangrui Song
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[RISCV] Optimize multiplication by constant 

... to shift/add or shift/sub.

Do not enable it on riscv32 with the M extension where decomposeMulByConstant
may not be an optimization.

Reviewed By: luismarques, MaskRay

Differential Revision: https://reviews.llvm.org/D82660
parent 34c48520
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