CGP: Clear data structures at the end of a loop iteration instead of the beginning.

Clearing LargeOffsetGEPMap at the end fixes a bug where if a large
offset GEP is in a dead basic block, we fail an assertion when trying
to delete the block due to the asserting VH in LargeOffsetGEPMap.

Differential Revision: https://reviews.llvm.org/D53464

llvm-svn: 345082

1 files changed, 5 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index fa5cc4d..6e73f7d 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -436,11 +436,6 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
   bool MadeChange = true;
   while (MadeChange) {
     MadeChange = false;
-    SeenChainsForSExt.clear();
-    ValToSExtendedUses.clear();
-    RemovedInsts.clear();
-    LargeOffsetGEPMap.clear();
-    LargeOffsetGEPID.clear();
     for (Function::iterator I = F.begin(); I != F.end(); ) {
       BasicBlock *BB = &*I++;
       bool ModifiedDTOnIteration = false;
@@ -460,6 +455,11 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
       I->deleteValue();
 
     EverMadeChange |= MadeChange;
+    SeenChainsForSExt.clear();
+    ValToSExtendedUses.clear();
+    RemovedInsts.clear();
+    LargeOffsetGEPMap.clear();
+    LargeOffsetGEPID.clear();
   }
 
   SunkAddrs.clear();