[PATCH] D19391: transform obscured FP sign bit ops into a fabs/fneg using TLI hook

[Sanjay Patel via llvm-commits]

spatel updated this revision to Diff 59440.
spatel added a comment.

Patch updated:
Revert r249701 ([ValueTracking] teach computeKnownBits that a fabs() clears sign bits).
The LangRef mentions IEEE format for NaN/Inf in the IR, but I'm not sure if that allows us to deduce the position of the sign bit in IR FP formats. To be safe, we'll just remove the fabs() ValueTracking logic for now.


http://reviews.llvm.org/D19391

Files:
  include/llvm/Target/TargetLowering.h
  lib/Analysis/ValueTracking.cpp
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  test/CodeGen/AArch64/fcvt-int.ll
  test/Transforms/InstCombine/and2.ll
  test/Transforms/InstCombine/fabs.ll

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