================
@@ -5026,10 +5026,23 @@ calculateRegisterUsage(VPlan &Plan,
ArrayRef<ElementCount> VFs,
// even in the scalar case.
RegUsage[ClassID] += 1;
} else {
+ // The output from scaled phis and scaled reductions actually have
+ // fewer lanes than the VF.
+ auto VF = VFs[J];
+ if (auto *ReductionR = dyn_cast<VPReductionPHIRecipe>(R))
----------------
SamTebbs33 wrote:
Yeah that's a nice idea. We could add a `VPScaledRecipe` class. I agree with
doing it afterwards.
https://github.com/llvm/llvm-project/pull/133090
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