diff options
Diffstat (limited to 'lib/Target/AArch64/AArch64ISelLowering.cpp')
| -rw-r--r-- | lib/Target/AArch64/AArch64ISelLowering.cpp | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/lib/Target/AArch64/AArch64ISelLowering.cpp b/lib/Target/AArch64/AArch64ISelLowering.cpp index e2e472fa9f..071b432998 100644 --- a/lib/Target/AArch64/AArch64ISelLowering.cpp +++ b/lib/Target/AArch64/AArch64ISelLowering.cpp @@ -1863,7 +1863,7 @@ AArch64TargetLowering::LowerGlobalAddressELF(SDValue Op, // TableGen doesn't have easy access to the CodeModel or RelocationModel, so // we make that distinction here. - // We support the static, small memory model for now. + // We support the small memory model for now. assert(getTargetMachine().getCodeModel() == CodeModel::Small); EVT PtrVT = getPointerTy(); @@ -1871,6 +1871,18 @@ AArch64TargetLowering::LowerGlobalAddressELF(SDValue Op, const GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Op); const GlobalValue *GV = GN->getGlobal(); unsigned Alignment = GV->getAlignment(); + Reloc::Model RelocM = getTargetMachine().getRelocationModel(); + + if (GV->isWeakForLinker() && RelocM == Reloc::Static) { + // Weak symbols can't use ADRP/ADD pair since they should evaluate to + // zero when undefined. In PIC mode the GOT can take care of this, but in + // absolute mode we use a constant pool load. + return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), + DAG.getConstantPool(GV, GN->getValueType(0)), + MachinePointerInfo::getConstantPool(), + /*isVolatile=*/ false, /*isNonTemporal=*/ true, + /*isInvariant=*/ true, 8); + } if (Alignment == 0) { const PointerType *GVPtrTy = cast<PointerType>(GV->getType()); @@ -1886,7 +1898,6 @@ AArch64TargetLowering::LowerGlobalAddressELF(SDValue Op, } unsigned char HiFixup, LoFixup; - Reloc::Model RelocM = getTargetMachine().getRelocationModel(); bool UseGOT = Subtarget->GVIsIndirectSymbol(GV, RelocM); if (UseGOT) { |