================
@@ -16213,6 +16213,10 @@ SDValue DAGCombiner::visitAssertExt(SDNode *N) {
AssertVT == cast<VTSDNode>(N0.getOperand(1))->getVT())
return N0;
+ // fold (assert?ext c, vt) -> c
+ if (isa<ConstantSDNode>(N0))
+ return N0;
----------------
el-ev wrote:
It would still need a call to `DAG.FoldConstantArithmetic` here, neither
cleaner nor cheaper.
https://github.com/llvm/llvm-project/pull/196785
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