[llvm] [VPlan] Expand SCEV min/max via scalar intrinsic VPInstructions. (PR #207842)

[Florian Hahn via llvm-commits]

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@@ -842,6 +842,43 @@ VPValue *VPSCEVExpander::tryToExpand(const SCEV *S) {
     }
     return Builder.createScalarCast(Opcode, Op, S->getType(), DL);
   }
+  case scUMaxExpr:
+  case scSMaxExpr:
+  case scUMinExpr:
+  case scSMinExpr: {
+    auto *MinMax = cast<SCEVMinMaxExpr>(S);
+    Intrinsic::ID IntrinsicID;
+    switch (S->getSCEVType()) {
+    case scUMaxExpr:
+      IntrinsicID = Intrinsic::umax;
+      break;
+    case scSMaxExpr:
+      IntrinsicID = Intrinsic::smax;
+      break;
+    case scUMinExpr:
+      IntrinsicID = Intrinsic::umin;
+      break;
+    case scSMinExpr:
+      IntrinsicID = Intrinsic::smin;
+      break;
+    default:
+      llvm_unreachable("not a min/max SCEV");
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fhahn wrote:

done thanks

https://github.com/llvm/llvm-project/pull/207842