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Craig Topper 1b3f3aebe1 [X86] Teach combineBitcastvxi1 to prefer movmsk on avx512 in more cases
If the input to the bitcast is a sign bit test, it makes sense to
directly use vpmovmskb or vmovmskps/pd. This removes the need to
copy the sign bits to a k-register and then to a GPR.

Fixes PR46200.

Differential Revision: https://reviews.llvm.org/D81327
2020-06-13 14:50:13 -07:00
2020-02-10 10:33:58 -08:00
2019-07-17 07:02:02 +00:00
2020-03-14 18:08:26 -07:00

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