[FastISel] Fix crash for gc.relocate lowring
Lowering safepoint checks that all gc.relocaes observed in safepoint
must be lowered. However Fast-Isel is able to skip dead gc.relocate.
To resolve this issue we just ignore dead gc.relocate in the check.
Reviewers: reames
Reviewed By: reames
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D60184
llvm-svn: 357742
diff --git a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h
index a4fdce5..7050793 100644
--- a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h
+++ b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h
@@ -66,13 +66,18 @@
/// before the next statepoint. If we don't see it, we'll report
/// an assertion.
void scheduleRelocCall(const CallInst &RelocCall) {
- PendingGCRelocateCalls.push_back(&RelocCall);
+ // We are not interested in lowering dead instructions.
+ if (!RelocCall.use_empty())
+ PendingGCRelocateCalls.push_back(&RelocCall);
}
/// Remove this gc_relocate from the list we're expecting to see
/// before the next statepoint. If we weren't expecting to see
/// it, we'll report an assertion.
void relocCallVisited(const CallInst &RelocCall) {
+ // We are not interested in lowering dead instructions.
+ if (RelocCall.use_empty())
+ return;
auto I = llvm::find(PendingGCRelocateCalls, &RelocCall);
assert(I != PendingGCRelocateCalls.end() &&
"Visited unexpected gcrelocate call");