Graham Hunter
4028dd2e93
[InstSimplify] Fold converted urem to 0 if there's no overlapping bits ( #71528 ) ...
When folding urem instructions we can end up not recognizing that
the output will always be 0 due to Value*s being different, despite
generating the same data (in this case, 2 different calls to vscale).
This patch recognizes the (x << N) & (add (x << M), -1) pattern that
instcombine replaces urem with after the two vscale calls have been
reduced to one via CSE, then replaces with 0 when x is a power of 2
and N >= M.
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