[all-commits] [llvm/llvm-project] 9170e3: Add support for `nneg` flag with `uitofp`

[goldsteinn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9170e3857521324c096240bf38877e0ffe1a402e
      https://github.com/llvm/llvm-project/commit/9170e3857521324c096240bf38877e0ffe1a402e
  Author: Noah Goldstein <goldstein.w.n at gmail.com>
  Date:   2024-04-09 (Tue, 09 Apr 2024)

  Changed paths:
    M llvm/docs/LangRef.rst
    M llvm/include/llvm/IR/IRBuilder.h
    M llvm/include/llvm/IR/InstrTypes.h
    M llvm/lib/AsmParser/LLParser.cpp
    M llvm/lib/Bitcode/Reader/BitcodeReader.cpp
    M llvm/lib/IR/Instruction.cpp
    M llvm/lib/IR/Operator.cpp
    M llvm/test/Assembler/flags.ll
    M llvm/test/Bitcode/flags.ll
    M llvm/test/Transforms/InstCombine/freeze.ll
    M llvm/test/Transforms/SimplifyCFG/HoistCode.ll

  Log Message:
  -----------
  Add support for `nneg` flag with `uitofp`

As noted when #82404 was pushed (canonicalizing `sitofp` -> `uitofp`),
different signedness on fp casts can have dramatic performance
implications on different backends.

So, it makes to create a reliable means for the backend to pick its
cast signedness if either are correct.

Further, this allows us to start canonicalizing `sitofp`- > `uitofp`
which may easy middle end analysis.

Closes #86141



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