Skip uncodintional first Last inst registering

alexey-bataev · alexey-bataev · commit fb40c2f67d00 · 2025-02-28T17:53:21.000Z
Created using spr 1.3.5
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -12502,7 +12502,7 @@ InstructionCost BoUpSLP::getSpillCost() {
         return It->second.getInt() != 0;
       PrevInstIt = Checked->getIterator().getReverse();
     }
-    SmallVector<const Instruction *> LastInstsInRange(1, Last);
+    SmallVector<const Instruction *> LastInstsInRange;
     while (InstIt != PrevInstIt && Budget <= BudgetLimit) {
       // Debug information does not impact spill cost.
       // Vectorized calls, represented as vector intrinsics, do not impact spill

Original file line number	Diff line number	Diff line change
`@@ -12502,7 +12502,7 @@ InstructionCost BoUpSLP::getSpillCost() {`
`12502`	`12502`	`return It->second.getInt() != 0;`
`12503`	`12503`	`PrevInstIt = Checked->getIterator().getReverse();`
`12504`	`12504`	`}`
`12505`		`- SmallVector<const Instruction *> LastInstsInRange(1, Last);`
	`12505`	`+ SmallVector<const Instruction *> LastInstsInRange;`
`12506`	`12506`	`while (InstIt != PrevInstIt && Budget <= BudgetLimit) {`
`12507`	`12507`	`// Debug information does not impact spill cost.`
`12508`	`12508`	`// Vectorized calls, represented as vector intrinsics, do not impact spill`