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DAG: Follow-up to r319692 check the truncates inputs have the same type 

MatchRotate assumes the types of the types of LHS and RHS are equal,
which is always the case then they come from an OR node, but here
we're getting them from two different TRUNC nodes, so we have to check
the types.

llvm-svn: 319695
This commit is contained in:
Hans Wennborg 2017-12-04 20:48:50 +00:00
parent 05b618e31f
commit e117129ef7
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -4653,7 +4653,8 @@ SDNode *DAGCombiner::MatchRotate(SDValue LHS, SDValue RHS, const SDLoc &DL) {
if (!HasROTL && !HasROTR) return nullptr;
// Check for truncated rotate.
if (LHS.getOpcode() == ISD::TRUNCATE && RHS.getOpcode() == ISD::TRUNCATE) {
if (LHS.getOpcode() == ISD::TRUNCATE && RHS.getOpcode() == ISD::TRUNCATE &&
LHS.getOperand(0).getValueType() == RHS.getOperand(0).getValueType()) {
assert(LHS.getValueType() == RHS.getValueType());
if (SDNode *Rot = MatchRotate(LHS.getOperand(0), RHS.getOperand(0), DL)) {
return DAG.getNode(ISD::TRUNCATE, SDLoc(LHS), LHS.getValueType(),