* PIC codegen for X86/Linux has been implemented
* PIC-aware internal structures in X86 Codegen have been refactored
* Visibility (default/weak) has been added
* Docs fixes (external weak linkage, visibility, formatting)
llvm-svn: 33136
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
index 5c80f23..f36456e 100644
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -938,10 +938,23 @@
MachineBasicBlock &FirstMBB = BB->getParent()->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
SSARegMap *RegMap = BB->getParent()->getSSARegMap();
- GlobalBaseReg = RegMap->createVirtualRegister(X86::GR32RegisterClass);
+ unsigned PC = RegMap->createVirtualRegister(X86::GR32RegisterClass);
+
const TargetInstrInfo *TII = TM.getInstrInfo();
BuildMI(FirstMBB, MBBI, TII->get(X86::MovePCtoStack));
- BuildMI(FirstMBB, MBBI, TII->get(X86::POP32r), GlobalBaseReg);
+ BuildMI(FirstMBB, MBBI, TII->get(X86::POP32r), PC);
+
+ // If we're using vanilla 'GOT' PIC style, we should use relative addressing
+ // not to pc, but to _GLOBAL_ADDRESS_TABLE_ external
+ if (Subtarget->isPICStyleGOT()) {
+ GlobalBaseReg = RegMap->createVirtualRegister(X86::GR32RegisterClass);
+ BuildMI(FirstMBB, MBBI, TII->get(X86::ADD32ri), GlobalBaseReg).
+ addReg(PC).
+ addExternalSymbol("_GLOBAL_OFFSET_TABLE_");
+ } else {
+ GlobalBaseReg = PC;
+ }
+
}
return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).Val;
}