Don't count DebugInfo instructions in another limit
(lest they affect codegen).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index e0d3ac4..f3fb4fb 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -11439,12 +11439,18 @@
SI.getAlignment()))
SI.setAlignment(KnownAlign);
- // Do really simple DSE, to catch cases where there are several consequtive
+ // Do really simple DSE, to catch cases where there are several consecutive
// stores to the same location, separated by a few arithmetic operations. This
// situation often occurs with bitfield accesses.
BasicBlock::iterator BBI = &SI;
for (unsigned ScanInsts = 6; BBI != SI.getParent()->begin() && ScanInsts;
--ScanInsts) {
+ // Don't count debug info directives, lest they affect codegen.
+ if (isa<DbgInfoIntrinsic>(BBI)) {
+ ScanInsts++;
+ --BBI;
+ continue;
+ }
--BBI;
if (StoreInst *PrevSI = dyn_cast<StoreInst>(BBI)) {