Sanjay Patel e82db87fb1 [InstCombine] drop poison flags when simplifying 'shl' based on demanded bits ...

As with other transforms in demanded bits, we must be careful not to
wrongly propagate nsw/nuw if we are reducing values leading up to the shift.

This bug was introduced with 1b24f35f84 and leads to the miscompile
shown in:
https://llvm.org/PR50341

2021-05-14 13:54:13 -04:00

61 KiB

Raw Blame History

View Raw