[all-commits] [llvm/llvm-project] 933247: [SimplifyLibCalls] Merge sqrt into the power of ex...

[Anton Sidorenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 933247d9d6a2aee66de49e84077ce116630e76cd
      https://github.com/llvm/llvm-project/commit/933247d9d6a2aee66de49e84077ce116630e76cd
  Author: Anton Sidorenko <anton.sidorenko at syntacore.com>
  Date:   2024-02-06 (Tue, 06 Feb 2024)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/SimplifyLibCalls.h
    M llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
    M llvm/test/Transforms/InstCombine/sqrt.ll

  Log Message:
  -----------
  [SimplifyLibCalls] Merge sqrt into the power of exp (#79146)

Under fast-math flags it's possible to convert `sqrt(exp(X)) `into
`exp(X * 0.5)`. I suppose that this transformation is always profitable.
This is similar to the optimization existing in GCC.