[PATCH] D40792: DAG: Match truncated rotation (PR35487)
Eli Friedman via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Dec 4 12:40:01 PST 2017
efriedma added inline comments.
================
Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:4657
+ if (LHS.getOpcode() == ISD::TRUNCATE && RHS.getOpcode() == ISD::TRUNCATE) {
+ assert(LHS.getValueType() == RHS.getValueType());
+ if (SDNode *Rot = MatchRotate(LHS.getOperand(0), RHS.getOperand(0), DL)) {
----------------
Do you need to check that `LHS.getOperand(0).getValueType() == RHS.getOperand(0).getValueType()`?
https://reviews.llvm.org/D40792
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