Author: resistor
Date: Tue Jan 29 19:24:05 2008
New Revision: 46541
URL: http://llvm.org/viewvc/llvm-project?rev=46541&view=rev
Log:
Fix an issue where, under very specific circumstances, memdep could end up
dereferencing the end
of one of its internal maps.
Modified:
llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp
Modified: llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp?rev=46541&r1=46540&r2=46541&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/MemoryDependenceAnalysis.cpp Tue Jan 29 19:24:05
2008
@@ -451,8 +451,6 @@
// Figure out the new dep for things that currently depend on rem
Instruction* newDep = NonLocal;
- reverseDep[depGraphLocal[rem].first].erase(rem);
-
for (DenseMap<BasicBlock*, Value*>::iterator DI =
depGraphNonLocal[rem].begin(), DE = depGraphNonLocal[rem].end();
DI != DE; ++DI)
@@ -462,6 +460,8 @@
depMapType::iterator depGraphEntry = depGraphLocal.find(rem);
if (depGraphEntry != depGraphLocal.end()) {
+ reverseDep[depGraphLocal[rem].first].erase(rem);
+
if (depGraphEntry->second.first != NonLocal &&
depGraphEntry->second.second) {
// If we have dep info for rem, set them to it
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