avoid assertion due to overflow if Num is negative

vchuravy · vchuravy · commit 7cbeb3d1b0ce · 2019-02-17T23:14:44.000-05:00
diff --git a/src/llvm-late-gc-lowering.cpp b/src/llvm-late-gc-lowering.cpp
@@ -821,9 +821,9 @@ void LateLowerGCFrame::NoteUse(State &S, BBState &BBS, Value *V, BitVector &Uses
     else if (isSpecialPtrVec(V->getType())) {
         std::vector<int> Nums = NumberVector(S, V);
         for (int Num : Nums) {
-            MaybeResize(BBS, Num);
             if (Num < 0)
                 continue;
+            MaybeResize(BBS, Num);
             Uses[Num] = 1;
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -821,9 +821,9 @@ void LateLowerGCFrame::NoteUse(State &S, BBState &BBS, Value *V, BitVector &Uses`
`821`	`821`	`else if (isSpecialPtrVec(V->getType())) {`
`822`	`822`	`std::vector<int> Nums = NumberVector(S, V);`
`823`	`823`	`for (int Num : Nums) {`
`824`		`- MaybeResize(BBS, Num);`
`825`	`824`	`if (Num < 0)`
`826`	`825`	`continue;`
	`826`	`+ MaybeResize(BBS, Num);`
`827`	`827`	`Uses[Num] = 1;`
`828`	`828`	`}`
`829`	`829`	`}`