DebugLabelFolder ruthlessly deletes redundant labels. However, sometimes the redundant labels is referenced by debug info somewhere else. This patch provies a way so that dwarf writer can mark labels as used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68813 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index 4bbc4dd..1d8109e 100644
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -333,7 +333,7 @@
// Iterate through instructions.
for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
// Is it a label.
- if (I->isDebugLabel()) {
+ if (I->isDebugLabel() && !MMI->isDbgLabelUsed(I->getOperand(0).getImm())){
// The label ID # is always operand #0, an immediate.
unsigned NextLabel = I->getOperand(0).getImm();