NFC. Move getAlignment helper function from ValueTracking to Value class.
Reviewed By: reames, hfinkel
Differential Revision: http://reviews.llvm.org/D16144
llvm-svn: 261735
diff --git a/llvm/lib/IR/Value.cpp b/llvm/lib/IR/Value.cpp
index 2e12d91..f02c8fd 100644
--- a/llvm/lib/IR/Value.cpp
+++ b/llvm/lib/IR/Value.cpp
@@ -519,6 +519,48 @@
return stripPointerCastsAndOffsets<PSK_InBounds>(this);
}
+unsigned Value::getPointerAlignment(const DataLayout &DL) const {
+ assert(getType()->isPointerTy() && "must be pointer");
+
+ unsigned Align = 0;
+ if (auto *GO = dyn_cast<GlobalObject>(this)) {
+ Align = GO->getAlignment();
+ if (Align == 0) {
+ if (auto *GVar = dyn_cast<GlobalVariable>(GO)) {
+ Type *ObjectType = GVar->getValueType();
+ if (ObjectType->isSized()) {
+ // If the object is defined in the current Module, we'll be giving
+ // it the preferred alignment. Otherwise, we have to assume that it
+ // may only have the minimum ABI alignment.
+ if (GVar->isStrongDefinitionForLinker())
+ Align = DL.getPreferredAlignment(GVar);
+ else
+ Align = DL.getABITypeAlignment(ObjectType);
+ }
+ }
+ }
+ } else if (const Argument *A = dyn_cast<Argument>(this)) {
+ Align = A->getParamAlignment();
+
+ if (!Align && A->hasStructRetAttr()) {
+ // An sret parameter has at least the ABI alignment of the return type.
+ Type *EltTy = cast<PointerType>(A->getType())->getElementType();
+ if (EltTy->isSized())
+ Align = DL.getABITypeAlignment(EltTy);
+ }
+ } else if (const AllocaInst *AI = dyn_cast<AllocaInst>(this))
+ Align = AI->getAlignment();
+ else if (auto CS = ImmutableCallSite(this))
+ Align = CS.getAttributes().getParamAlignment(AttributeSet::ReturnIndex);
+ else if (const LoadInst *LI = dyn_cast<LoadInst>(this))
+ if (MDNode *MD = LI->getMetadata(LLVMContext::MD_align)) {
+ ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
+ Align = CI->getLimitedValue();
+ }
+
+ return Align;
+}
+
Value *Value::DoPHITranslation(const BasicBlock *CurBB,
const BasicBlock *PredBB) {
PHINode *PN = dyn_cast<PHINode>(this);