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Another step forward in PPC64 JIT support: we now no-longer need stubs

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emitted for external globals in PPC64-JIT-PIC mode (which is good because
we didn't handle them before!).

This also fixes a bug handling the picbase delta, which we would get wrong
in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32451 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-12-11 23:22:45 +00:00
parent a77fa7edbf
commit 57fc62c8d2
5 changed files with 83 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/PowerPC/PPCCodeEmitter.cpp
+28 -24
View File
@@ -136,15 +136,9 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
if (MI.getOpcode() == PPC::BL || MI.getOpcode() == PPC::BL8)
Reloc = PPC::reloc_pcrel_bx;
else {
// If in PIC mode, we need to encode the negated address of the
// 'movepctolr' into the unrelocated field. After relocation, we'll have
// &gv-&movepctolr in the imm field. Once &movepctolr is added to the imm
// field, we get &gv.
if (TM.getRelocationModel() == Reloc::PIC_) {
assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
rv = -(intptr_t)MovePCtoLROffset - 4;
}
switch (MI.getOpcode()) {
default: MI.dump(); assert(0 && "Unknown instruction for relocation!");
case PPC::LIS:
@@ -152,7 +146,6 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
case PPC::ADDIS:
case PPC::ADDIS8:
Reloc = PPC::reloc_absolute_high; // Pointer to symbol
rv >>= 16;
break;
case PPC::LI:
case PPC::LI8:
@@ -173,7 +166,6 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
case PPC::STFS:
case PPC::STFD:
Reloc = PPC::reloc_absolute_low;
rv &= 0xFFFF;
break;
case PPC::LWA:
@@ -181,25 +173,37 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
case PPC::STD:
case PPC::STD_32:
Reloc = PPC::reloc_absolute_low_ix;
rv &= 0xFFFF;
rv >>= 2;
break;
}
}
if (MO.isGlobalAddress())
MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
Reloc, MO.getGlobal(), 0));
else if (MO.isExternalSymbol())
MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
Reloc, MO.getSymbolName(), 0));
else if (MO.isConstantPoolIndex())
MCE.addRelocation(MachineRelocation::getConstPool(
MCE.getCurrentPCOffset(),
Reloc, MO.getConstantPoolIndex(), 0));
else // isJumpTableIndex
MCE.addRelocation(MachineRelocation::getJumpTable(
MCE.getCurrentPCOffset(),
Reloc, MO.getJumpTableIndex(), 0));
MachineRelocation R;
if (MO.isGlobalAddress()) {
R = MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
MO.getGlobal(), 0);
} else if (MO.isExternalSymbol()) {
R = MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
Reloc, MO.getSymbolName(), 0);
} else if (MO.isConstantPoolIndex()) {
R = MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
Reloc, MO.getConstantPoolIndex(), 0);
} else {
assert(MO.isJumpTableIndex());
R = MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
Reloc, MO.getJumpTableIndex(), 0);
}
// If in PIC mode, we need to encode the negated address of the
// 'movepctolr' into the unrelocated field. After relocation, we'll have
// &gv-&movepctolr-4 in the imm field. Once &movepctolr is added to the imm
// field, we get &gv. This doesn't happen for branch relocations, which are
// always implicitly pc relative.
if (TM.getRelocationModel() == Reloc::PIC_ && Reloc != PPC::reloc_pcrel_bx){
assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
R.setConstantVal(-(intptr_t)MovePCtoLROffset - 4);
}
MCE.addRelocation(R);
} else if (MO.isMachineBasicBlock()) {
unsigned Reloc = 0;
unsigned Opcode = MI.getOpcode();