[PATCH] D139904: InstCombine: Fold logic of fp_classes together

[Matt Arsenault via Phabricator via llvm-commits]

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Move logical operators on pairs of llvm.is.fpclass on the same value
into the test mask of a single is_fpclass.

      

or (class x, mask0), (class x, mask1) -> class x, (mask0 | mask1)
and (class x, mask0), (class x, mask1) -> class x, (mask0 & mask1)
xor (class x, mask0), (class x, mask1) -> class x, (mask0 ^ mask1)

      

The and/or cases should appear frequently in the builtin math
libraries; haven't seen the xor case but handle it for completeness.


https://reviews.llvm.org/D139904

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/lib/Transforms/InstCombine/InstCombineInternal.h
  llvm/test/Transforms/InstCombine/is_fpclass.ll

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