[all-commits] [llvm/llvm-project] e00366: [AArch64] Check for negative numbers when adjustin...

[AZero13 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e00366dcde294b420ae9decf5ac5d85463fd274f
      https://github.com/llvm/llvm-project/commit/e00366dcde294b420ae9decf5ac5d85463fd274f
  Author: AZero13 <gfunni234 at gmail.com>
  Date:   2025-05-30 (Fri, 30 May 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/arm64-csel.ll
    M llvm/test/CodeGen/AArch64/check-sign-bit-before-extension.ll
    M llvm/test/CodeGen/AArch64/cmp-to-cmn.ll
    M llvm/test/CodeGen/AArch64/csel-subs-swapped.ll
    M llvm/test/CodeGen/AArch64/logical_shifted_reg.ll
    M llvm/test/CodeGen/AArch64/select-constant-xor.ll
    M llvm/test/CodeGen/AArch64/signbit-shift.ll
    M llvm/test/CodeGen/AArch64/signbit-test.ll
    M llvm/test/CodeGen/AArch64/typepromotion-signed.ll
    M llvm/test/CodeGen/AArch64/use-cr-result-of-dom-icmp-st.ll
    M llvm/test/CodeGen/AArch64/win64_vararg.ll

  Log Message:
  -----------
  [AArch64] Check for negative numbers when adjusting icmps (#141151)

This relies on the fact that we can use tst and ands for comparisons as
by emitComparison.

Also has mitigations for when comparing with -1 and 1 to avoid
regressions.

Fixes: https://github.com/llvm/llvm-project/issues/141137



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