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Commit 72b324de authored by Simon Pilgrim's avatar Simon Pilgrim
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[TargetLowering] Add BuildSDiv support for division by one or negone. 

This reduces most of the sdiv stages (the MULHS, shifts etc.) to just zero/identity values and use the numerator scale factor to multiply by +1/-1.

llvm-svn: 340260
parent 3cd1d27b
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