Craig Topper 56289647be
[DAGCombiner] Preserve nuw when converting mul to shl. Use nuw in srl+shl combine. (#155043)
If the srl+shl have the same shift amount and the shl has the nuw flag,
we can remove both.

In the affected test, the InterleavedAccess pass will emit a udiv after
the `mul nuw`. We expect them to combine away. The remaining shifts on
the RV64 tests are because we didn't add the zeroext attribute to the
incoming evl operand.
2025-08-25 20:44:06 -07:00
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