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Fix loading and storing PC-relative static variables, courtesy of Nate Begeman.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14468 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-06-28 18:20:59 +00:00
parent a6e58b3cfb
commit 7e5812cd17
2 changed files with 22 additions and 4 deletions
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13
lib/Target/PowerPC/PPC32ISelSimple.cpp
View File

@ -365,10 +365,19 @@ unsigned ISel::getReg(Value *V, MachineBasicBlock *MBB,
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);

13
lib/Target/PowerPC/PowerPCISelSimple.cpp
View File

@ -365,10 +365,19 @@ unsigned ISel::getReg(Value *V, MachineBasicBlock *MBB,
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);