[all-commits] [llvm/llvm-project] d5c9ff: [SDAG] Intersect poison-generating flags after CSE...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d5c9ffd545ebf171346ac69b15fafeee469f0b3c
      https://github.com/llvm/llvm-project/commit/d5c9ffd545ebf171346ac69b15fafeee469f0b3c
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-07-03 (Wed, 03 Jul 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    A llvm/test/CodeGen/AArch64/pr96366.ll
    M llvm/test/CodeGen/AMDGPU/dagcombine-fma-crash.ll
    A llvm/test/CodeGen/RISCV/pr96366.ll

  Log Message:
  -----------
  [SDAG] Intersect poison-generating flags after CSE (#97434)

This patch fixes a miscompilation when `N` gets CSEed to `Existing`:
```
Existing: t5: i32 = sub nuw Constant:i32<0>, t3
N: t30: i32 = sub Constant:i32<0>, t3
```

Fixes https://github.com/llvm/llvm-project/issues/96366.



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