[PATCH] D147410: [RISCV] Optimize multiplication with immediates

[Ben Shi via Phabricator via llvm-commits]

benshi001 added a comment.

ping ...

The optimization of `(mul x, c)` to `(ADD (SLLI x, i0), (SLLI x, i1))` is only enabled for i32 multiplication on rv64, is due to the regression of i64 multiplication on rv32.

we can change the condition to that `c` should only be used once, then the above regression can also be avoided, and ohter chances of optimization can be enabled.


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D147410