[llvm] ISel: introduce vector ISD::LRINT, ISD::LLRINT; custom RISCV lowering (PR #66924)
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Thu Sep 21 04:06:30 PDT 2023
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@@ -17206,6 +17210,21 @@ SDValue DAGCombiner::visitFP_TO_UINT(SDNode *N) {
return FoldIntToFPToInt(N, DAG);
}
+SDValue DAGCombiner::visitXRINT(SDNode *N) {
+ SDValue N0 = N->getOperand(0);
+ EVT VT = N->getValueType(0);
+
+ // fold (lrint|llrint undef) -> undef
+ if (N0.isUndef())
+ return DAG.getUNDEF(VT);
+
+ // fold (lrint|llrint c1fp) -> c1
+ if (DAG.isConstantFPBuildVectorOrConstantFP(N0))
+ return DAG.getNode(N->getOpcode(), SDLoc(N), VT, N0);
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ShivaChen wrote:
I guest RKSimon means is there folding similar with FoldIntToFPToInt?
https://github.com/llvm/llvm-project/pull/66924
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