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Allow machine operands to represent global variables with offsets. This is

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useful when you have a reference like:

int A[100];

void foo() { A[10] = 1; }

In this case, &A[10] is a single constant and should be treated as such.

Only MO_GlobalAddress and MO_ExternalSymbol are allowed to use this field, no
other operand type is.

This is another fine patch contributed by Jeff Cohen!!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17007 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-15 04:38:41 +00:00
parent 47eb6567e2
commit ca4f6ebefc
3 changed files with 53 additions and 26 deletions
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61
include/llvm/CodeGen/MachineInstr.h
View File

@ -126,48 +126,60 @@ private:
char flags; // see bit field definitions above
MachineOperandType opType:8; // Pack into 8 bits efficiently after flags.
int regNum; // register number for an explicit register
union {
int regNum; // register number for an explicit register
// will be set for a value after reg allocation
private:
int offset; // Offset to address of global or external, only
// valid for MO_GlobalAddress and MO_ExternalSym
} extra;
void zeroContents () {
memset (&contents, 0, sizeof (contents));
memset (&extra, 0, sizeof (extra));
}
MachineOperand(int ImmVal = 0, MachineOperandType OpTy = MO_VirtualRegister)
: flags(0), opType(OpTy), regNum(-1) {
: flags(0), opType(OpTy) {
zeroContents ();
contents.immedVal = ImmVal;
extra.regNum = -1;
}
MachineOperand(int Reg, MachineOperandType OpTy, UseType UseTy)
: flags(UseTy), opType(OpTy), regNum(Reg) {
: flags(UseTy), opType(OpTy) {
zeroContents ();
extra.regNum = Reg;
}
MachineOperand(Value *V, MachineOperandType OpTy, UseType UseTy,
bool isPCRelative = false)
: flags(UseTy | (isPCRelative?PCRELATIVE:0)), opType(OpTy), regNum(-1) {
bool isPCRelative = false, int Offset = 0)
: flags(UseTy | (isPCRelative?PCRELATIVE:0)), opType(OpTy) {
zeroContents ();
contents.value = V;
extra.offset = Offset;
}
MachineOperand(MachineBasicBlock *mbb)
: flags(0), opType(MO_MachineBasicBlock), regNum(-1) {
: flags(0), opType(MO_MachineBasicBlock) {
zeroContents ();
contents.MBB = mbb;
extra.regNum = -1;
}
MachineOperand(const std::string &SymName, bool isPCRelative)
: flags(isPCRelative?PCRELATIVE:0), opType(MO_ExternalSymbol), regNum(-1) {
MachineOperand(const std::string &SymName, bool isPCRelative, int Offset)
: flags(isPCRelative?PCRELATIVE:0), opType(MO_ExternalSymbol) {
zeroContents ();
contents.SymbolName = new std::string (SymName);
extra.offset = Offset;
}
public:
MachineOperand(const MachineOperand &M)
: flags(M.flags), opType(M.opType), regNum(M.regNum) {
: flags(M.flags), opType(M.opType) {
zeroContents ();
contents = M.contents;
extra = M.extra;
if (isExternalSymbol())
contents.SymbolName = new std::string(M.getSymbolName());
}
@ -184,7 +196,7 @@ public:
contents = MO.contents;
flags = MO.flags;
opType = MO.opType;
regNum = MO.regNum;
extra = MO.extra;
if (isExternalSymbol())
contents.SymbolName = new std::string(MO.getSymbolName());
return *this;
@ -245,7 +257,7 @@ public:
}
int getMachineRegNum() const {
assert(opType == MO_MachineRegister && "Wrong MachineOperand accessor");
return regNum;
return extra.regNum;
}
int getImmedValue() const {
assert(isImmediate() && "Wrong MachineOperand accessor");
@ -271,6 +283,11 @@ public:
assert(isGlobalAddress() && "Wrong MachineOperand accessor");
return (GlobalValue*)contents.value;
}
int getOffset() const {
assert((isGlobalAddress() || isExternalSymbol()) &&
"Wrong MachineOperand accessor");
return extra.offset;
}
const std::string &getSymbolName() const {
assert(isExternalSymbol() && "Wrong MachineOperand accessor");
return *contents.SymbolName;
@ -292,7 +309,7 @@ public:
/// allocated to this operand.
///
bool hasAllocatedReg() const {
return (regNum >= 0 &&
return (extra.regNum >= 0 &&
(opType == MO_VirtualRegister || opType == MO_CCRegister ||
opType == MO_MachineRegister));
}
@ -302,7 +319,7 @@ public:
///
unsigned getReg() const {
assert(hasAllocatedReg());
return regNum;
return extra.regNum;
}
/// MachineOperand mutators...
@ -311,7 +328,7 @@ public:
// This method's comment used to say: 'TODO: get rid of this duplicate
// code.' It's not clear where the duplication is.
assert(hasAllocatedReg() && "This operand cannot have a register number!");
regNum = Reg;
extra.regNum = Reg;
}
void setValueReg(Value *val) {
@ -324,6 +341,12 @@ public:
contents.immedVal = immVal;
}
void setOffset(int Offset) {
assert((isGlobalAddress() || isExternalSymbol()) &&
"Wrong MachineOperand accessor");
extra.offset = Offset;
}
friend std::ostream& operator<<(std::ostream& os, const MachineOperand& mop);
/// markHi32, markLo32, etc. - These methods are deprecated and only used by
@ -342,7 +365,7 @@ private:
void setRegForValue(int reg) {
assert(opType == MO_VirtualRegister || opType == MO_CCRegister ||
opType == MO_MachineRegister);
regNum = reg;
extra.regNum = reg;
}
friend class MachineInstr;
@ -615,18 +638,18 @@ public:
operands.push_back(MachineOperand(I, MachineOperand::MO_ConstantPoolIndex));
}
void addGlobalAddressOperand(GlobalValue *GV, bool isPCRelative) {
void addGlobalAddressOperand(GlobalValue *GV, bool isPCRelative, int Offset) {
assert(!OperandsComplete() &&
"Trying to add an operand to a machine instr that is already done!");
operands.push_back(
MachineOperand((Value*)GV, MachineOperand::MO_GlobalAddress,
MachineOperand::Use, isPCRelative));
MachineOperand::Use, isPCRelative, Offset));
}
/// addExternalSymbolOperand - Add an external symbol operand to this instr
///
void addExternalSymbolOperand(const std::string &SymName, bool isPCRelative) {
operands.push_back(MachineOperand(SymName, isPCRelative));
operands.push_back(MachineOperand(SymName, isPCRelative, 0));
}
//===--------------------------------------------------------------------===//

4
include/llvm/CodeGen/MachineInstrBuilder.h
View File

@ -124,8 +124,8 @@ public:
}
const MachineInstrBuilder &addGlobalAddress(GlobalValue *GV,
bool isPCRelative = false) const {
MI->addGlobalAddressOperand(GV, isPCRelative);
bool isPCRelative = false, int Offset = 0) const {
MI->addGlobalAddressOperand(GV, isPCRelative, Offset);
return *this;
}

14
lib/CodeGen/MachineInstr.cpp
View File

@ -127,7 +127,7 @@ void MachineInstr::SetMachineOperandVal(unsigned i,
assert(i < operands.size()); // may be explicit or implicit op
operands[i].opType = opTy;
operands[i].contents.value = V;
operands[i].regNum = -1;
operands[i].extra.regNum = -1;
}
void
@ -141,7 +141,7 @@ MachineInstr::SetMachineOperandConst(unsigned i,
operands[i].opType = opTy;
operands[i].contents.value = NULL;
operands[i].contents.immedVal = intValue;
operands[i].regNum = -1;
operands[i].extra.regNum = -1;
operands[i].flags = 0;
}
@ -150,7 +150,7 @@ void MachineInstr::SetMachineOperandReg(unsigned i, int regNum) {
operands[i].opType = MachineOperand::MO_MachineRegister;
operands[i].contents.value = NULL;
operands[i].regNum = regNum;
operands[i].extra.regNum = regNum;
}
// Used only by the SPARC back-end.
@ -302,10 +302,14 @@ static void print(const MachineOperand &MO, std::ostream &OS,
OS << "<cp#" << MO.getConstantPoolIndex() << ">";
break;
case MachineOperand::MO_GlobalAddress:
OS << "<ga:" << ((Value*)MO.getGlobal())->getName() << ">";
OS << "<ga:" << ((Value*)MO.getGlobal())->getName();
if (MO.getOffset()) OS << "+" << MO.getOffset();
OS << ">";
break;
case MachineOperand::MO_ExternalSymbol:
OS << "<es:" << MO.getSymbolName() << ">";
OS << "<es:" << MO.getSymbolName();
if (MO.getOffset()) OS << "+" << MO.getOffset();
OS << ">";
break;
default:
assert(0 && "Unrecognized operand type");