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Commit 0767e43d authored by Simon Pilgrim's avatar Simon Pilgrim
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[CostModel][X86] Adjust bitreverse/ctpop/ctlz/cttz AVX2+ costs based on llvm-mca reports 

Based off the worse case numbers generated by D103695, the AVX2/512 bit reversing/counting costs were higher than necessary (based off instruction counts instead of actual throughput).
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