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Commit 346ee549 authored by Simon Pilgrim's avatar Simon Pilgrim
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[GlobalISel][X86] Add G_CTTZ_ZERO_UNDEF/G_CTTZ legalization handling 

G_CTTZ_ZERO_UNDEF is always legal using the BSF instruction, G_CTTZ requires the BMI1 TZCNT instruction
parent a1421797
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