[llvm] [VPlan] Support multiple F(Max|Min)Num reductions. (PR #161735)

[Florian Hahn via llvm-commits]

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@@ -879,52 +873,71 @@ bool VPlanTransforms::handleMaxMinNumReductions(VPlan &Plan) {
   }
 
   VPBasicBlock *LatchVPBB = LoopRegion->getExitingBasicBlock();
-  VPBuilder Builder(LatchVPBB->getTerminator());
-  auto *LatchExitingBranch = cast<VPInstruction>(LatchVPBB->getTerminator());
-  assert(LatchExitingBranch->getOpcode() == VPInstruction::BranchOnCount &&
+  VPBuilder LatchBuilder(LatchVPBB->getTerminator());
+  VPValue *IsNaNLane = nullptr;
+  SmallPtrSet<VPValue *, 2> RdxResults;
+  for (const auto &[RedPhiR, MinMaxOp] : MinMaxNumReductionsToHandle) {
+    assert(RecurrenceDescriptor::isFPMinMaxNumRecurrenceKind(
+               RedPhiR->getRecurrenceKind()) &&
+           "unsupported reduction");
+
+    VPValue *IsNaN =
+        LatchBuilder.createFCmp(CmpInst::FCMP_UNO, MinMaxOp, MinMaxOp);
+    IsNaNLane = IsNaNLane ? LatchBuilder.createOr(IsNaNLane, IsNaN) : IsNaN;
+  }
+
+  VPValue *AnyNaNLane =
+      LatchBuilder.createNaryOp(VPInstruction::AnyOf, {IsNaNLane});
+  VPBasicBlock *MiddleVPBB = Plan.getMiddleBlock();
+  VPBuilder MiddleBuilder(MiddleVPBB, MiddleVPBB->begin());
+  for (const auto &[RedPhiR, MinMaxOp] : MinMaxNumReductionsToHandle) {
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fhahn wrote:

removed thanks

https://github.com/llvm/llvm-project/pull/161735