Fix loading and storing PC-relative static variables, courtesy of Nate Begeman.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14468 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPC32ISelSimple.cpp b/lib/Target/PowerPC/PPC32ISelSimple.cpp
index 4302beb..6d7b585 100644
--- a/lib/Target/PowerPC/PPC32ISelSimple.cpp
+++ b/lib/Target/PowerPC/PPC32ISelSimple.cpp
@@ -365,10 +365,19 @@
copyConstantToRegister(MBB, IPt, C, Reg);
return Reg;
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
+ // GV is located at PC + distance
+ unsigned LRsave = makeAnotherReg(Type::IntTy);
+ unsigned CurPC = makeAnotherReg(Type::IntTy);
unsigned Reg1 = makeAnotherReg(V->getType());
unsigned Reg2 = makeAnotherReg(V->getType());
- // Move the address of the global into the register
- BuildMI(*MBB, IPt, PPC32::LOADHiAddr, 2, Reg1).addReg(PPC32::R0)
+ // Save the old LR
+ BuildMI(*MBB, IPt, PPC32::MFLR, 0, LRsave);
+ // Move PC to destination reg
+ BuildMI(*MBB, IPt, PPC32::MovePCtoLR, 0, CurPC);
+ // Restore the old LR
+ BuildMI(*MBB, IPt, PPC32::MTLR, 1).addReg(LRsave);
+ // Move value at PC + distance into return reg
+ BuildMI(*MBB, IPt, PPC32::LOADHiAddr, 2, Reg1).addReg(CurPC)
.addGlobalAddress(GV);
BuildMI(*MBB, IPt, PPC32::LOADLoAddr, 2, Reg2).addReg(Reg1)
.addGlobalAddress(GV);