[llvm] Add support for single reductions in ComplexDeinterleavingPass (PR #112875)

[Florian Hahn via llvm-commits]

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@@ -1556,13 +1726,41 @@ void ComplexDeinterleavingGraph::identifyReductionNodes() {
         break;
       }
     }
+
+    auto *Real = OperationInstruction[i];
+    // We want to check that we have 2 operands, but the function attributes
+    // being counted as operands bloats this value.
+    if (Real->getNumOperands() < 2)
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fhahn wrote:

Looks like we are missing a check to ensure we only have integer types here. With FP types, we currently crash due to creating `llvm.reduce.add` reductions for floating point types. It also doesn't check for the rigth FP flags AFAICT.

Put up https://github.com/llvm/llvm-project/pull/139469 to bail out

https://github.com/llvm/llvm-project/pull/112875