[all-commits] [llvm/llvm-project] 729925: DAG: Use fast variants of fast math libcalls (#147...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7299250c030546b6811f5a1e0c4fd86f4380192e
      https://github.com/llvm/llvm-project/commit/7299250c030546b6811f5a1e0c4fd86f4380192e
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-07-13 (Sun, 13 Jul 2025)

  Changed paths:
    M llvm/include/llvm/IR/RuntimeLibcalls.td
    M llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
    M llvm/lib/IR/RuntimeLibcalls.cpp
    A llvm/test/CodeGen/Hexagon/fast-math-libcalls.ll

  Log Message:
  -----------
  DAG: Use fast variants of fast math libcalls (#147481)

Hexagon currently has an untested global flag to control fast
math variants of libcalls. Add fast variants as explicit libcall
options so this can be a flag based lowering decision, and implement
it. I have no idea what fast math flags the hexagon case requires,
so I picked the maximally potentially relevant set of flags although
this probably is refinable per call. Looking in compiler-rt, I'm not
sure if the fast variants are anything more than aliases.



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