| commit | dbd219aef4be56754c793589c60bd787b7de60c2 | [log] [tgz] |
|---|---|---|
| author | Yingwei Zheng <dtcxzyw2333@gmail.com> | Sun Feb 23 12:57:45 2025 +0800 |
| committer | GitHub <noreply@github.com> | Sun Feb 23 12:57:45 2025 +0800 |
| tree | 73c863baec080413d4b403cd59b846144c9b02f9 | |
| parent | ccad5e77442f7f237939395ebce1ae7adf187380 [diff] |
[DAGCombiner][X86] Correctly clean up high bits in `combinei64TruncSrlAdd` (#128353) A counterexample for original implementation: https://alive2.llvm.org/ce/z/7ieYLg This patch uses zext instead of anyext to fix the original issue. BTW, we should keep low `64 - shamt` bits instead of `shamt - 32`: https://alive2.llvm.org/ce/z/ruQP_Z Some codes are simplified to avoid confusion. Proof: https://alive2.llvm.org/ce/z/z_jdHD Closes https://github.com/llvm/llvm-project/issues/128309.
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