Craig Topper 7dcb2c4b0a [X86] Teach combineTruncatedArithmetic to handle some cases of ISD::SUB ...

We can safely avoid interfering with the subus combine if both inputs are freely truncatable. Either both extends, or an extend and a constant vector.

Differential Revision: https://reviews.llvm.org/D50878

llvm-svn: 340212

2018-08-20 20:57:35 +00:00

228 KiB

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