[all-commits] [llvm/llvm-project] a747e8: [InstCombine] Fold `fpto{s|u}i non-norm` to zero (...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a747e86caacf0ba3d5272474da8c10eb0b67dbc2
      https://github.com/llvm/llvm-project/commit/a747e86caacf0ba3d5272474da8c10eb0b67dbc2
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-03-19 (Tue, 19 Mar 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
    M llvm/test/Transforms/InstCombine/fpcast.ll

  Log Message:
  -----------
  [InstCombine] Fold `fpto{s|u}i non-norm` to zero (#85569)

This patch enables more optimization after canonicalizing `fmul X, 0.0`
into a copysign.
I decide to implement this fold in InstCombine because
`computeKnownFPClass` may be expensive.

Alive2: https://alive2.llvm.org/ce/z/ASM8tQ



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