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Make the code generator rip of dead constant expr uses before deciding

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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
This commit is contained in:
Chris Lattner 2009-03-09 05:52:15 +00:00
parent 319e63234a
commit f231c07228
1 changed files with 16 additions and 10 deletions
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26
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -418,18 +418,24 @@ bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
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;