[PATCH] D82663: [CodeGen] Have CodeGen for fixed-point unsigned with padding emit signed operations.

[Bevin Hansson via Phabricator via cfe-commits]

ebevhan added a comment.

Another point is, if we for example have an i16 umul.fix in legalization, we have no way of knowing in the general case that it is safe to replace it with an smul.fix, since the information that the MSB is not significant does not exist on IR level. This is the 'loss of padding bit' that I'm referring to.


Repository:
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  https://reviews.llvm.org/D82663/new/

https://reviews.llvm.org/D82663