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Commit 481b1856 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86] combineCarryThroughADD - recognise X86ISD::ADD(AND(X,1),-1) pattern can... 

[X86] combineCarryThroughADD - recognise X86ISD::ADD(AND(X,1),-1) pattern can be folded to X86ISD::BT

As mentioned on D122482, if we've generated a masked overflow test see if we can fold it to X86ISD::BT to feed a X86ISD::ADC/SBB

Differential Revision: https://reviews.llvm.org/D122572
parent 2f1261ab
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