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[SystemZ] Define the call instructions as pseudo aliases.

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Similar to r191364, but for calls.  This patch also removes the shortening
of BRASL to BRAS within a TU.  Doing that was a bit controversial internally,
since there's a strong expectation with the z assembler that WYWIWYG.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191366 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-09-25 10:37:17 +00:00
parent e39a156b92
commit 76f8ae87b4
9 changed files with 97 additions and 147 deletions
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98
lib/Target/SystemZ/SystemZMCInstLower.cpp
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@@ -15,15 +15,6 @@
using namespace llvm;
// If Opcode is an interprocedural reference that can be shortened,
// return the short form, otherwise return 0.
static unsigned getShortenedInstr(unsigned Opcode) {
switch (Opcode) {
case SystemZ::BRASL: return SystemZ::BRAS;
}
return Opcode;
}
// Return the VK_* enumeration for MachineOperand target flags Flags.
static MCSymbolRefExpr::VariantKind getVariantKind(unsigned Flags) {
switch (Flags & SystemZII::MO_SYMBOL_MODIFIER) {
@@ -39,66 +30,67 @@ SystemZMCInstLower::SystemZMCInstLower(Mangler *mang, MCContext &ctx,
SystemZAsmPrinter &asmprinter)
: Mang(mang), Ctx(ctx), AsmPrinter(asmprinter) {}
MCOperand SystemZMCInstLower::lowerSymbolOperand(const MachineOperand &MO,
const MCSymbol *Symbol,
int64_t Offset) const {
MCSymbolRefExpr::VariantKind Kind = getVariantKind(MO.getTargetFlags());
const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, Kind, Ctx);
if (Offset) {
const MCExpr *OffsetExpr = MCConstantExpr::Create(Offset, Ctx);
Expr = MCBinaryExpr::CreateAdd(Expr, OffsetExpr, Ctx);
const MCExpr *
SystemZMCInstLower::getExpr(const MachineOperand &MO,
MCSymbolRefExpr::VariantKind Kind) const {
const MCSymbol *Symbol;
bool HasOffset = true;
switch (MO.getType()) {
case MachineOperand::MO_MachineBasicBlock:
Symbol = MO.getMBB()->getSymbol();
HasOffset = false;
break;
case MachineOperand::MO_GlobalAddress:
Symbol = Mang->getSymbol(MO.getGlobal());
break;
case MachineOperand::MO_ExternalSymbol:
Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
break;
case MachineOperand::MO_JumpTableIndex:
Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
HasOffset = false;
break;
case MachineOperand::MO_ConstantPoolIndex:
Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
break;
case MachineOperand::MO_BlockAddress:
Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
break;
default:
llvm_unreachable("unknown operand type");
}
return MCOperand::CreateExpr(Expr);
const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, Kind, Ctx);
if (HasOffset)
if (int64_t Offset = MO.getOffset()) {
const MCExpr *OffsetExpr = MCConstantExpr::Create(Offset, Ctx);
Expr = MCBinaryExpr::CreateAdd(Expr, OffsetExpr, Ctx);
}
return Expr;
}
MCOperand SystemZMCInstLower::lowerOperand(const MachineOperand &MO) const {
switch (MO.getType()) {
default:
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
return MCOperand::CreateReg(MO.getReg());
case MachineOperand::MO_Immediate:
return MCOperand::CreateImm(MO.getImm());
case MachineOperand::MO_MachineBasicBlock:
return lowerSymbolOperand(MO, MO.getMBB()->getSymbol(),
/* MO has no offset field */0);
case MachineOperand::MO_GlobalAddress:
return lowerSymbolOperand(MO, Mang->getSymbol(MO.getGlobal()),
MO.getOffset());
case MachineOperand::MO_ExternalSymbol: {
StringRef Name = MO.getSymbolName();
return lowerSymbolOperand(MO, AsmPrinter.GetExternalSymbolSymbol(Name),
MO.getOffset());
}
case MachineOperand::MO_JumpTableIndex:
return lowerSymbolOperand(MO, AsmPrinter.GetJTISymbol(MO.getIndex()),
/* MO has no offset field */0);
case MachineOperand::MO_ConstantPoolIndex:
return lowerSymbolOperand(MO, AsmPrinter.GetCPISymbol(MO.getIndex()),
MO.getOffset());
case MachineOperand::MO_BlockAddress: {
const BlockAddress *BA = MO.getBlockAddress();
return lowerSymbolOperand(MO, AsmPrinter.GetBlockAddressSymbol(BA),
MO.getOffset());
default: {
MCSymbolRefExpr::VariantKind Kind = getVariantKind(MO.getTargetFlags());
return MCOperand::CreateExpr(getExpr(MO, Kind));
}
}
}
void SystemZMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI) const {
unsigned Opcode = MI->getOpcode();
// When emitting binary code, start with the shortest form of an instruction
// and then relax it where necessary.
if (!AsmPrinter.OutStreamer.hasRawTextSupport())
Opcode = getShortenedInstr(Opcode);
OutMI.setOpcode(Opcode);
OutMI.setOpcode(MI->getOpcode());
for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
const MachineOperand &MO = MI->getOperand(I);
// Ignore all implicit register operands.