[PATCH] D70488: [InstCombine] Infer fast math flags on fadd/fsub/fmul/fcmp

[Benjamin Kramer via Phabricator via llvm-commits]

bkramer created this revision.
bkramer added a reviewer: spatel.
Herald added subscribers: cfe-commits, hiraditya.
Herald added projects: clang, LLVM.

Applies nnan, ninf and nsz. This allows more instructions to be folded
away even with no fast math flags, e.g. (int)x * (b ? 1.0 : 0.0) -> b ? x : 0.0

As a side effect this will propagate fast math flags out of inlined fast
math code into surrounding functions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D70488

Files:
  clang/test/CodeGen/builtins-systemz-zvector.c
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/lib/Transforms/InstCombine/InstCombineInternal.h
  llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/Transforms/InstCombine/add-sitofp.ll
  llvm/test/Transforms/InstCombine/cast-int-fcmp-eq-0.ll
  llvm/test/Transforms/InstCombine/fadd-fsub-factor.ll
  llvm/test/Transforms/InstCombine/fast-math.ll
  llvm/test/Transforms/InstCombine/fcmp.ll
  llvm/test/Transforms/InstCombine/known-never-nan.ll
  llvm/test/Transforms/InstCombine/minmax-fp.ll
  llvm/test/Transforms/InstCombine/pow_fp_int.ll

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