tree 5c997bf52b39683cd5139055f9900cae8f5538e6
parent 35668eef128197aa2a014fbc16af81d534faf948
author Simon Pilgrim <llvm-dev@redking.me.uk> 1613497052 +0000
committer Copybara-Service <copybara-worker@google.com> 1613731986 -0800

[DAG] PromoteIntRes_ADDSUBSHLSAT - promote ISD::UADDSAT as clamped add

Similar to D96622, we're better off just promoting uaddsat(x,y) -> umin(add(x,y),c) instead of trying to perform a shifted uaddsat.

I initially tried to just use shifted promotion in cases where we didn't have a legal/custom umin - but we don't appear to have any targets that have uaddsat but not umin, so imo we're better off always using the umin and avoid an untested shifted uaddsat code path.

Differential Revision: https://reviews.llvm.org/D96767

GitOrigin-RevId: df45c1813509fc579c5e0a4f2824923db92c2dbb