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Factorize out a concept - no functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67454 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2009-03-21 21:27:31 +00:00
parent 802cd84eb4
commit 64da9409cb
4 changed files with 15 additions and 8 deletions
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9
include/llvm/GlobalVariable.h
View File

@ -78,6 +78,15 @@ public:
///
inline bool hasInitializer() const { return !isDeclaration(); }
/// hasDefinitiveInitializer - Whether the global variable has an initializer,
/// and this is the initializer that will be used in the final executable.
inline bool hasDefinitiveInitializer() const {
return hasInitializer() &&
// The initializer of a global variable with weak linkage may change at
// link time.
!mayBeOverridden();
}
/// getInitializer - Return the initializer for this global variable. It is
/// illegal to call this method if the global is external, because we cannot
/// tell what the value is initialized to!

7
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -11227,15 +11227,14 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
// Instcombine load (constant global) into the value loaded.
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op))
if (GV->isConstant() && !GV->isDeclaration() && !GV->mayBeOverridden())
if (GV->isConstant() && GV->hasDefinitiveInitializer())
return ReplaceInstUsesWith(LI, GV->getInitializer());
// Instcombine load (constantexpr_GEP global, 0, ...) into the value loaded.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op)) {
if (CE->getOpcode() == Instruction::GetElementPtr) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
if (GV->isConstant() && !GV->isDeclaration() &&
!GV->mayBeOverridden())
if (GV->isConstant() && GV->hasDefinitiveInitializer())
if (Constant *V =
ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE))
return ReplaceInstUsesWith(LI, V);
@ -11259,7 +11258,7 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
// If this load comes from anywhere in a constant global, and if the global
// is all undef or zero, we know what it loads.
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op->getUnderlyingObject())){
if (GV->isConstant() && GV->hasInitializer() && !GV->mayBeOverridden()) {
if (GV->isConstant() && GV->hasDefinitiveInitializer()) {
if (GV->getInitializer()->isNullValue())
return ReplaceInstUsesWith(LI, Constant::getNullValue(LI.getType()));
else if (isa<UndefValue>(GV->getInitializer()))

4
lib/Transforms/Scalar/SCCP.cpp
View File

@ -1131,7 +1131,7 @@ void SCCPSolver::visitLoadInst(LoadInst &I) {
// Transform load (constant global) into the value loaded.
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Ptr)) {
if (GV->isConstant()) {
if (!GV->isDeclaration() && !GV->mayBeOverridden()) {
if (GV->hasDefinitiveInitializer()) {
markConstant(IV, &I, GV->getInitializer());
return;
}
@ -1150,7 +1150,7 @@ void SCCPSolver::visitLoadInst(LoadInst &I) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr))
if (CE->getOpcode() == Instruction::GetElementPtr)
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
if (GV->isConstant() && !GV->isDeclaration() && !GV->mayBeOverridden())
if (GV->isConstant() && GV->hasDefinitiveInitializer())
if (Constant *V =
ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE)) {
markConstant(IV, &I, V);

3
lib/Transforms/Utils/CloneFunction.cpp
View File

@ -335,8 +335,7 @@ ConstantFoldMappedInstruction(const Instruction *I) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0]))
if (!LI->isVolatile() && CE->getOpcode() == Instruction::GetElementPtr)
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
if (GV->isConstant() && !GV->isDeclaration() &&
!GV->mayBeOverridden())
if (GV->isConstant() && GV->hasDefinitiveInitializer())
return ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(),
CE);