Fix a silly mistake (which trips over an assertion) in r132099. rdar://9515076
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132194 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp
index d42d4ff..935cd5d 100644
--- a/lib/Transforms/Scalar/LICM.cpp
+++ b/lib/Transforms/Scalar/LICM.cpp
@@ -372,7 +372,11 @@
return !pointerInvalidatedByLoop(LI->getOperand(0), Size,
LI->getMetadata(LLVMContext::MD_tbaa));
} else if (CallInst *CI = dyn_cast<CallInst>(&I)) {
- // Handle obvious cases efficiently.
+ // Don't sink or hoist dbg info; it's legal, but not useful.
+ if (isa<DbgInfoIntrinsic>(I))
+ return false;
+
+ // Handle simple cases by querying alias analysis.
AliasAnalysis::ModRefBehavior Behavior = AA->getModRefBehavior(CI);
if (Behavior == AliasAnalysis::DoesNotAccessMemory)
return true;
@@ -522,14 +526,7 @@
SSA.AddAvailableValue(ExitBlock, New);
}
- // If the instruction doesn't dominate any exit blocks, it must be dead.
- if (NumInserted == 0) {
- CurAST->deleteValue(&I);
- if (!I.use_empty())
- I.replaceAllUsesWith(UndefValue::get(I.getType()));
- I.eraseFromParent();
- return;
- }
+ assert(NumInserted && "We shouldn't see dead instructions here!");
// Next, rewrite uses of the instruction, inserting PHI nodes as needed.
for (Value::use_iterator UI = I.use_begin(), UE = I.use_end(); UI != UE; ) {