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Add r159136 back now that pr13124 has been fixed.

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Original message:
If a constant or a function has linkonce_odr linkage and unnamed_addr, mark
hidden. Being linkonce_odr guarantees that it is available in every dso that
needs it. Being a constant/function with unnamed_addr guarantees that the
copies don't have to be merged.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-09-03 23:34:36 +00:00
parent 4b3e5f24ec
commit 79869ee59a
3 changed files with 31 additions and 0 deletions
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6
include/llvm/IR/GlobalValue.h
View File

@ -122,6 +122,9 @@ public:
static bool isAvailableExternallyLinkage(LinkageTypes Linkage) {
return Linkage == AvailableExternallyLinkage;
}
static bool isLinkOnceODRLinkage(LinkageTypes Linkage) {
return Linkage == LinkOnceODRLinkage;
}
static bool isLinkOnceLinkage(LinkageTypes Linkage) {
return Linkage == LinkOnceAnyLinkage ||
Linkage == LinkOnceODRLinkage ||
@ -202,6 +205,9 @@ public:
bool hasAvailableExternallyLinkage() const {
return isAvailableExternallyLinkage(Linkage);
}
bool hasLinkOnceODRLinkage() const {
return isLinkOnceODRLinkage(Linkage);
}
bool hasLinkOnceLinkage() const {
return isLinkOnceLinkage(Linkage);
}

11
lib/Transforms/IPO/GlobalOpt.cpp
View File

@ -1914,6 +1914,12 @@ bool GlobalOpt::ProcessGlobal(GlobalVariable *GV,
return true;
}
if (GV->hasLinkOnceODRLinkage() && GV->hasUnnamedAddr() && GV->isConstant() &&
GV->getVisibility() != GlobalValue::HiddenVisibility) {
GV->setVisibility(GlobalValue::HiddenVisibility);
return true;
}
if (!GV->hasLocalLinkage())
return false;
@ -1926,6 +1932,7 @@ bool GlobalOpt::ProcessGlobal(GlobalVariable *GV,
if (!GS.isCompared && !GV->hasUnnamedAddr()) {
GV->setUnnamedAddr(true);
NumUnnamed++;
return true;
}
if (GV->isConstant() || !GV->hasInitializer())
@ -2105,6 +2112,10 @@ bool GlobalOpt::OptimizeFunctions(Module &M) {
F->eraseFromParent();
Changed = true;
++NumFnDeleted;
} else if (F->hasLinkOnceODRLinkage() && F->hasUnnamedAddr() &&
F->getVisibility() != GlobalValue::HiddenVisibility) {
F->setVisibility(GlobalValue::HiddenVisibility);
Changed = true;
} else if (F->hasLocalLinkage()) {
if (F->getCallingConv() == CallingConv::C && !F->isVarArg() &&
!F->hasAddressTaken()) {

14
test/Transforms/GlobalOpt/hidden.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: opt %s -globalopt -S | FileCheck %s
@foo = linkonce_odr unnamed_addr constant i32 42
; CHECK: @foo = linkonce_odr hidden unnamed_addr constant i32 42
define linkonce_odr void @bar() unnamed_addr {
; CHECK: define linkonce_odr hidden void @bar() unnamed_addr {
ret void
}
define i32* @zed() {
call void @bar()
ret i32* @foo
}