[llvm] [VPlan] Track VPValues instead of VPRecipes in calculateRegisterUsage. (PR #155301)

[Florian Hahn via llvm-commits]

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@@ -593,8 +593,10 @@ SmallVector<VPRegisterUsage, 8> llvm::calculateRegisterUsageForPlan(
     LLVM_DEBUG(dbgs() << "LV(REG): At #" << Idx << " Interval # "
                       << OpenIntervals.size() << '\n');
 
-    // Add the current recipe to the list of open intervals.
-    OpenIntervals.insert(R);
+    // Add the VPValues defined by the current recipe to the list of open
+    // intervals.
+    for (VPValue *DefV : R->definedValues())
+      OpenIntervals.insert(DefV);
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fhahn wrote:

Added a check if DefV is in `Ends`, although it should mostly only happen with interleave groups with unused members I think; and those parts should probably be removed, but I'll check if I can find a case where it makes a difference.

https://github.com/llvm/llvm-project/pull/155301