Preserve debug info for unused zero extended boolean argument.
Radar 9422775.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131422 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp
index 4bca2fc..5af8c8b 100644
--- a/lib/Transforms/Utils/Local.cpp
+++ b/lib/Transforms/Utils/Local.cpp
@@ -785,10 +785,19 @@
if (!DIVar.Verify())
return false;
- Instruction *DbgVal =
- Builder.insertDbgValueIntrinsic(SI->getOperand(0), 0,
- DIVar, SI);
-
+ Instruction *DbgVal = NULL;
+ // If an argument is zero extended then use argument directly. The ZExt
+ // may be zapped by an optimization pass in future.
+ Argument *ExtendedArg = NULL;
+ if (ZExtInst *ZExt = dyn_cast<ZExtInst>(SI->getOperand(0)))
+ ExtendedArg = dyn_cast<Argument>(ZExt->getOperand(0));
+ if (SExtInst *SExt = dyn_cast<SExtInst>(SI->getOperand(0)))
+ ExtendedArg = dyn_cast<Argument>(SExt->getOperand(0));
+ if (ExtendedArg)
+ DbgVal = Builder.insertDbgValueIntrinsic(ExtendedArg, 0, DIVar, SI);
+ else
+ DbgVal = Builder.insertDbgValueIntrinsic(SI->getOperand(0), 0, DIVar, SI);
+
// Propagate any debug metadata from the store onto the dbg.value.
DebugLoc SIDL = SI->getDebugLoc();
if (!SIDL.isUnknown())