[all-commits] [llvm/llvm-project] 9397bd: [InstCombine] fold fcmp with lossy casted constant

[Sanjay Patel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9397bdc67eb2b9eedc247a89bef01c2484b48b89
      https://github.com/llvm/llvm-project/commit/9397bdc67eb2b9eedc247a89bef01c2484b48b89
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2022-03-08 (Tue, 08 Mar 2022)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
    M llvm/test/Transforms/InstCombine/fcmp.ll

  Log Message:
  -----------
  [InstCombine] fold fcmp with lossy casted constant

This is noted as a missing clang warning in #54222
(and we should still make that enhancement).

Alive2 proofs:
https://alive2.llvm.org/ce/z/Q8drDq
https://alive2.llvm.org/ce/z/pE6LRt

I don't see a single conversion for all predicates
using "getFCmpCode" logic, so other predicates are
left as a TODO item.