[PATCH] D28619: [NVPTX] Only lower sin/cos to approximate instructions if unsafe math is allowed.

[Artem Belevich via Phabricator via llvm-commits]

tra created this revision.
tra added reviewers: jlebar, jholewinski.
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Previously we'd always lower `@llvm.{sin,cos}.f32` to `{sin.cos}.approx.f32` instruction even when unsafe FP math was not allowed.

Clang-generated IR is not affected by this change as it uses precise sin/cos from CUDA's libdevice when unsafe math is disabled.


https://reviews.llvm.org/D28619

Files:
  lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp
  lib/Target/NVPTX/NVPTXISelDAGToDAG.h
  lib/Target/NVPTX/NVPTXISelLowering.cpp
  lib/Target/NVPTX/NVPTXISelLowering.h
  lib/Target/NVPTX/NVPTXInstrInfo.td
  test/CodeGen/NVPTX/fast-math.ll
  test/CodeGen/NVPTX/fcos-no-fast-math.ll
  test/CodeGen/NVPTX/fsin-no-fast-math.ll

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