[all-commits] [llvm/llvm-project] 2a2c35: [InstCombine] Fold `icmp spred (mul nsw X, Z), (mu...

Yingwei Zheng via All-commits all-commits at lists.llvm.org
Tue Oct 1 07:16:26 PDT 2024


  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2a2c35a9a652ba8562884ec76008979c761df207
      https://github.com/llvm/llvm-project/commit/2a2c35a9a652ba8562884ec76008979c761df207
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-10-01 (Tue, 01 Oct 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
    M llvm/test/Transforms/InstCombine/icmp-mul.ll

  Log Message:
  -----------
  [InstCombine] Fold `icmp spred (mul nsw X, Z), (mul nsw Y, Z)` into `icmp spred X, Y` (#110630)

```
icmp spred (mul nsw X, Z), (mul nsw Y, Z) -> icmp spred X, Y iff Z > 0
icmp spred (mul nsw X, Z), (mul nsw Y, Z) -> icmp spred Y, X iff Z < 0
```
Alive2: https://alive2.llvm.org/ce/z/9fXFfn



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