[all-commits] [llvm/llvm-project] 04ae6e: [ValueTracking] Fix incorrect inferrence about the...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 04ae6e600a3090ccc1f80d0110a1108aa73a54f8
      https://github.com/llvm/llvm-project/commit/04ae6e600a3090ccc1f80d0110a1108aa73a54f8
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-05-20 (Mon, 20 May 2024)

  Changed paths:
    M llvm/lib/Analysis/ValueTracking.cpp
    M llvm/test/Transforms/InstCombine/known-bits.ll
    M llvm/unittests/Analysis/ValueTrackingTest.cpp

  Log Message:
  -----------
  [ValueTracking] Fix incorrect inferrence about the signbit of sqrt (#92510)

According to IEEE Std 754-2019, `sqrt` returns nan when the input is
negative (except for -0). In this case, we cannot make assumptions about
sign bit of the result.

Fixes https://github.com/llvm/llvm-project/issues/92217



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