[llvm] [DAG] Enhance SDPatternMatch to match integer minimum and maximum patterns in addition to the existing ISD nodes. (PR #111774)

[Simon Pilgrim via llvm-commits]

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@@ -201,6 +201,15 @@ TEST_F(SelectionDAGPatternMatchTest, matchBinaryOp) {
   SDValue UMax = DAG->getNode(ISD::UMAX, DL, Int32VT, Op0, Op1);
   SDValue UMin = DAG->getNode(ISD::UMIN, DL, Int32VT, Op1, Op0);
 
+  SDValue ICMP_GT = DAG->getSetCC(DL, MVT::i1, Op0, Op1, ISD::SETGT);
+  SDValue ICMP_UGT = DAG->getSetCC(DL, MVT::i1, Op0, Op1, ISD::SETUGT);
+  SDValue ICMP_LT = DAG->getSetCC(DL, MVT::i1, Op0, Op1, ISD::SETLT);
+  SDValue ICMP_ULT = DAG->getSetCC(DL, MVT::i1, Op0, Op1, ISD::SETULT);
+  SDValue SMaxLike = DAG->getSelect(DL, MVT::i32, ICMP_GT, Op0, Op1);
+  SDValue UMaxLike = DAG->getSelect(DL, MVT::i32, ICMP_UGT, Op0, Op1);
+  SDValue SMinLike = DAG->getSelect(DL, MVT::i32, ICMP_LT, Op0, Op1);
+  SDValue UMinLike = DAG->getSelect(DL, MVT::i32, ICMP_ULT, Op0, Op1);
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RKSimon wrote:

Please can you add LE/GE test coverage?

https://github.com/llvm/llvm-project/pull/111774