Make the code generator rip of dead constant expr uses before deciding
whether a global is dead or not. This should fix PR3749 - linker adds
spurious use to appending globals. I can't reasonably add a testcase
for this, because the bc writer/reader strip dead constant users.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66404 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index fd71ba9..dcfa7a5 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -418,18 +418,24 @@
const TargetData *TD = TM.getTargetData();
unsigned Align = Log2_32(TD->getPointerPrefAlignment());
- if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
- SwitchToDataSection(TAI->getStaticCtorsSection());
- EmitAlignment(Align, 0);
- EmitXXStructorList(GV->getInitializer());
- return true;
+ if (GV->getName() == "llvm.global_ctors") {
+ GV->removeDeadConstantUsers();
+ if (GV->use_empty()) {
+ SwitchToDataSection(TAI->getStaticCtorsSection());
+ EmitAlignment(Align, 0);
+ EmitXXStructorList(GV->getInitializer());
+ return true;
+ }
}
- if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
- SwitchToDataSection(TAI->getStaticDtorsSection());
- EmitAlignment(Align, 0);
- EmitXXStructorList(GV->getInitializer());
- return true;
+ if (GV->getName() == "llvm.global_dtors") {
+ GV->removeDeadConstantUsers();
+ if (GV->use_empty()) {
+ SwitchToDataSection(TAI->getStaticDtorsSection());
+ EmitAlignment(Align, 0);
+ EmitXXStructorList(GV->getInitializer());
+ return true;
+ }
}
return false;