[llvm] [LoopUnroll] Introduce parallel accumulators when unrolling FP reductions. (PR #166630)

[Julian Nagele via llvm-commits]

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@@ -1256,14 +1257,19 @@ llvm::canParallelizeReductionWhenUnrolling(PHINode &Phi, Loop *L,
     return std::nullopt;
   RecurKind RK = RdxDesc.getRecurrenceKind();
   // Skip unsupported reductions.
-  // TODO: Handle additional reductions, including FP and min-max
-  // reductions.
-  if (!RecurrenceDescriptor::isIntegerRecurrenceKind(RK) ||
+  // TODO: Handle additional reductions, including min-max reductions.
+  if (!(RecurrenceDescriptor::isIntegerRecurrenceKind(RK) ||
+        RecurrenceDescriptor::isFloatingPointRecurrenceKind(RK)) ||
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juliannagele wrote:

Makes sense, thanks -- done!

https://github.com/llvm/llvm-project/pull/166630