Don't let the memory allocator outsmart GVN. ;-)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40655 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index ff66250244..3d04fc4fd8 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -558,6 +558,11 @@ void ValueTable::clear() {
   nextValueNumber = 1;
 }
 
+/// erase - Remove a value from the value numbering
+void ValueTable::erase(Value* V) {
+  valueNumbering.erase(V);
+}
+
 //===----------------------------------------------------------------------===//
 //                       ValueNumberedSet Class
 //===----------------------------------------------------------------------===//
@@ -871,6 +876,7 @@ bool GVN::processInstruction(Instruction* I,
   if (currAvail.test(num)) {
     Value* repl = find_leader(currAvail, num);
     
+    VN.erase(I);
     I->replaceAllUsesWith(repl);
     toErase.push_back(I);
     return true;