[PATCH] D82660: [RISCV] Optimize multiplication by specific immediates

[Ben Shi via Phabricator via llvm-commits]

benshi001 added a reviewer: kito-cheng.
benshi001 added a comment.

This patch can not cover all cases (especially "call __mulsi3" on rv32 without M extension), but at least it works well for most cases.

Maybe a better solution is make ISD::MUL as Custom, which I will try later. You are appreciated to review and accept such a partial optimization.


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  https://reviews.llvm.org/D82660/new/

https://reviews.llvm.org/D82660