[all-commits] [llvm/llvm-project] 3aae91: Reland "[ValueTracking] Compute knownbits from kno...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3aae916ff7fe9d0953aa63b2ba1d0e871f6f76fc
      https://github.com/llvm/llvm-project/commit/3aae916ff7fe9d0953aa63b2ba1d0e871f6f76fc
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-05-14 (Tue, 14 May 2024)

  Changed paths:
    M llvm/include/llvm/IR/PatternMatch.h
    M llvm/lib/Analysis/ValueTracking.cpp
    M llvm/test/CodeGen/AMDGPU/amdgpu-simplify-libcall-pow.ll
    M llvm/test/CodeGen/AMDGPU/amdgpu-simplify-libcall-pown.ll
    M llvm/test/CodeGen/AMDGPU/simplify-libcalls.ll
    M llvm/test/Transforms/InstCombine/known-bits.ll

  Log Message:
  -----------
  Reland "[ValueTracking] Compute knownbits from known fp classes" (#92084)

This patch relands https://github.com/llvm/llvm-project/pull/86409.

I mistakenly thought that `Known.makeNegative()` clears the sign bit of
`Known.Zero`. This patch fixes the assertion failure by explicitly
clearing the sign bit.



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