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Factorize out a concept - no functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67454 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -78,6 +78,15 @@ public:
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///
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inline bool hasInitializer() const { return !isDeclaration(); }
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/// hasDefinitiveInitializer - Whether the global variable has an initializer,
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/// and this is the initializer that will be used in the final executable.
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inline bool hasDefinitiveInitializer() const {
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return hasInitializer() &&
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// The initializer of a global variable with weak linkage may change at
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// link time.
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!mayBeOverridden();
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}
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/// getInitializer - Return the initializer for this global variable. It is
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/// illegal to call this method if the global is external, because we cannot
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/// tell what the value is initialized to!
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@ -11227,15 +11227,14 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
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// Instcombine load (constant global) into the value loaded.
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op))
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if (GV->isConstant() && !GV->isDeclaration() && !GV->mayBeOverridden())
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if (GV->isConstant() && GV->hasDefinitiveInitializer())
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return ReplaceInstUsesWith(LI, GV->getInitializer());
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// Instcombine load (constantexpr_GEP global, 0, ...) into the value loaded.
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op)) {
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if (CE->getOpcode() == Instruction::GetElementPtr) {
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
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if (GV->isConstant() && !GV->isDeclaration() &&
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!GV->mayBeOverridden())
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if (GV->isConstant() && GV->hasDefinitiveInitializer())
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if (Constant *V =
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ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE))
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return ReplaceInstUsesWith(LI, V);
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@ -11259,7 +11258,7 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
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// If this load comes from anywhere in a constant global, and if the global
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// is all undef or zero, we know what it loads.
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op->getUnderlyingObject())){
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if (GV->isConstant() && GV->hasInitializer() && !GV->mayBeOverridden()) {
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if (GV->isConstant() && GV->hasDefinitiveInitializer()) {
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if (GV->getInitializer()->isNullValue())
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return ReplaceInstUsesWith(LI, Constant::getNullValue(LI.getType()));
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else if (isa<UndefValue>(GV->getInitializer()))
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@ -1131,7 +1131,7 @@ void SCCPSolver::visitLoadInst(LoadInst &I) {
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// Transform load (constant global) into the value loaded.
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Ptr)) {
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if (GV->isConstant()) {
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if (!GV->isDeclaration() && !GV->mayBeOverridden()) {
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if (GV->hasDefinitiveInitializer()) {
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markConstant(IV, &I, GV->getInitializer());
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return;
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}
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@ -1150,7 +1150,7 @@ void SCCPSolver::visitLoadInst(LoadInst &I) {
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr))
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if (CE->getOpcode() == Instruction::GetElementPtr)
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
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if (GV->isConstant() && !GV->isDeclaration() && !GV->mayBeOverridden())
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if (GV->isConstant() && GV->hasDefinitiveInitializer())
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if (Constant *V =
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ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE)) {
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markConstant(IV, &I, V);
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@ -335,8 +335,7 @@ ConstantFoldMappedInstruction(const Instruction *I) {
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0]))
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if (!LI->isVolatile() && CE->getOpcode() == Instruction::GetElementPtr)
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
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if (GV->isConstant() && !GV->isDeclaration() &&
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!GV->mayBeOverridden())
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if (GV->isConstant() && GV->hasDefinitiveInitializer())
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return ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(),
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CE);
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