[PATCH] D105796: [RISCV] Optimize multiplication in the zba extension with SH*ADD

[Ben Shi via Phabricator via llvm-commits]

benshi001 added a comment.

I did not put the optimization of (mul x, 3 * power_of_2) in decomposeMulByConstant(). The reason is that using a PatLeaf is more simple than checking the pattern (ADD (SLLI), (SLLI).


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https://reviews.llvm.org/D105796