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[SelectionDAG] Allow constant folding for implicitly truncating BUILD_VECTOR nodes
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Authored by guyblank on Aug 8 2017, 11:00 PM.

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Summary

In FoldConstantArithmetic, handle BUILD_VECTOR nodes that do implicit truncation on the elements.

This is similar to what is done in FoldConstantVectorArithmetic.

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Repository
rL LLVM

Event Timeline

guyblank created this revision.Aug 8 2017, 11:00 PM
RKSimon accepted this revision.Aug 10 2017, 3:39 AM

LGTM. The duplication between this and FoldConstantVectorArithmetic suggests that a merging is overdue - add a TODO comment?

This revision is now accepted and ready to land.Aug 10 2017, 3:39 AM

Sure, I'll add a TODO, thanks.

This revision was automatically updated to reflect the committed changes.