[PATCH] D28883: DAG: Recognize no-signed-zeros-fp-math attribute

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added a reviewer: tstellarAMD.
Herald added subscribers: nhaehnle, wdng, mehdi_amini.

clang already emits this with -cl-no-signed-zeros, but codegen
doesn't do anything with it. Treat it like the other fast math
attributes, and change one place to use it.


https://reviews.llvm.org/D28883

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/Target/TargetOptions.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/TargetMachine.cpp
  test/CodeGen/AMDGPU/enable-no-signed-zeros-fp-math.ll
  test/CodeGen/AMDGPU/fsub.ll

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