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* Add support for loading FP constants from the constant pool 

* Load FP values into int regs as well for vararg functions; without memory ops!

llvm-svn: 14700
This commit is contained in:
Misha Brukman 2004-07-08 18:02:38 +00:00
parent b604b4df21
commit 59b2d4ef9d
2 changed files with 88 additions and 20 deletions
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54
llvm/lib/Target/PowerPC/PPC32ISelSimple.cpp
View File

@ -493,8 +493,21 @@ void ISel::copyConstantToRegister(MachineBasicBlock *MBB,
const Type *Ty = CFP->getType();
assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
// Load addr of constant to reg; constant is located at PC + distance
unsigned CurPC = makeAnotherReg(Type::IntTy);
unsigned Reg1 = makeAnotherReg(Type::IntTy);
unsigned Reg2 = makeAnotherReg(Type::IntTy);
// Move PC to destination reg
BuildMI(*MBB, IP, PPC32::MovePCtoLR, 0, CurPC);
// Move value at PC + distance into return reg
BuildMI(*MBB, IP, PPC32::LOADHiAddr, 2, Reg1).addReg(CurPC)
.addConstantPoolIndex(CPI);
BuildMI(*MBB, IP, PPC32::LOADLoAddr, 2, Reg2).addReg(Reg1)
.addConstantPoolIndex(CPI);
unsigned LoadOpcode = (Ty == Type::FloatTy) ? PPC32::LFS : PPC32::LFD;
addConstantPoolReference(BuildMI(*MBB, IP, LoadOpcode, 2, R), CPI);
BuildMI(*MBB, IP, LoadOpcode, 2, R).addImm(0).addReg(Reg2);
} else if (isa<ConstantPointerNull>(C)) {
// Copy zero (null pointer) to the register.
BuildMI(*MBB, IP, PPC32::ADDI, 2, R).addReg(PPC32::R0).addImm(0);
@ -1182,6 +1195,19 @@ void ISel::visitBranchInst(BranchInst &BI) {
}
}
static Constant* minUConstantForValue(uint64_t val) {
if (val <= 1)
return ConstantBool::get(val);
else if (ConstantUInt::isValueValidForType(Type::UShortTy, val))
return ConstantUInt::get(Type::UShortTy, val);
else if (ConstantUInt::isValueValidForType(Type::UIntTy, val))
return ConstantUInt::get(Type::UIntTy, val);
else if (ConstantUInt::isValueValidForType(Type::ULongTy, val))
return ConstantUInt::get(Type::ULongTy, val);
std::cerr << "Value: " << val << " not accepted for any integral type!\n";
abort();
}
/// doCall - This emits an abstract call instruction, setting up the arguments
/// and the return value as appropriate. For the actual function call itself,
@ -1213,6 +1239,7 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
// Arguments go on the stack in reverse order, as specified by the ABI.
unsigned ArgOffset = 0;
int GPR_remaining = 8, FPR_remaining = 13;
unsigned GPR_idx = 0, FPR_idx = 0;
static const unsigned GPR[] = {
PPC32::R3, PPC32::R4, PPC32::R5, PPC32::R6,
PPC32::R7, PPC32::R8, PPC32::R9, PPC32::R10,
@ -1222,7 +1249,6 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
PPC32::F7, PPC32::F8, PPC32::F9, PPC32::F10, PPC32::F11, PPC32::F12,
PPC32::F13
};
unsigned GPR_idx = 0, FPR_idx = 0;
for (unsigned i = 0, e = Args.size(); i != e; ++i) {
unsigned ArgReg;
@ -1277,6 +1303,7 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
case cFP:
ArgReg = Args[i].Val ? getReg(Args[i].Val) : Args[i].Reg;
if (Args[i].Ty == Type::FloatTy) {
assert(!isVarArg && "Cannot pass floats to vararg functions!");
// Reg or stack?
if (FPR_remaining > 0) {
BuildMI(BB, PPC32::FMR, 1, FPR[FPR_idx]).addReg(ArgReg);
@ -1286,7 +1313,6 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
BuildMI(BB, PPC32::STFS, 3).addReg(ArgReg).addImm(ArgOffset)
.addReg(PPC32::R1);
}
assert(!isVarArg && "Cannot pass floats to vararg functions!");
} else {
assert(Args[i].Ty == Type::DoubleTy && "Unknown FP type!");
// Reg or stack?
@ -1296,13 +1322,21 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
FPR_idx++;
// For vararg functions, must pass doubles via int regs as well
if (isVarArg) {
BuildMI(BB, PPC32::STFD, 3).addReg(ArgReg).addImm(ArgOffset)
.addReg(PPC32::R1);
union DU {
double FVal;
struct {
uint32_t hi32;
uint32_t lo32;
} UVal;
} U;
U.FVal = cast<ConstantFP>(Args[i].Val)->getValue();
if (GPR_remaining > 0) {
Constant *hi32 = minUConstantForValue(U.UVal.hi32);
copyConstantToRegister(BB, BB->end(), hi32, GPR[GPR_idx]);
}
if (GPR_remaining > 1) {
BuildMI(BB, PPC32::LWZ, 2, GPR[GPR_idx]).addImm(ArgOffset)
.addReg(PPC32::R1);
BuildMI(BB, PPC32::LWZ, 2, GPR[GPR_idx + 1])
.addImm(ArgOffset+4).addReg(PPC32::R1);
Constant *lo32 = minUConstantForValue(U.UVal.lo32);
copyConstantToRegister(BB, BB->end(), lo32, GPR[GPR_idx+1]);
}
}
} else {
@ -1311,7 +1345,7 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
}
ArgOffset += 4; // 8 byte entry, not 4.
GPR_remaining--; // uses up 2 GPRs
GPR_remaining--; // uses up 2 GPRs
GPR_idx++;
}
break;

54
llvm/lib/Target/PowerPC/PowerPCISelSimple.cpp
View File

@ -493,8 +493,21 @@ void ISel::copyConstantToRegister(MachineBasicBlock *MBB,
const Type *Ty = CFP->getType();
assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
// Load addr of constant to reg; constant is located at PC + distance
unsigned CurPC = makeAnotherReg(Type::IntTy);
unsigned Reg1 = makeAnotherReg(Type::IntTy);
unsigned Reg2 = makeAnotherReg(Type::IntTy);
// Move PC to destination reg
BuildMI(*MBB, IP, PPC32::MovePCtoLR, 0, CurPC);
// Move value at PC + distance into return reg
BuildMI(*MBB, IP, PPC32::LOADHiAddr, 2, Reg1).addReg(CurPC)
.addConstantPoolIndex(CPI);
BuildMI(*MBB, IP, PPC32::LOADLoAddr, 2, Reg2).addReg(Reg1)
.addConstantPoolIndex(CPI);
unsigned LoadOpcode = (Ty == Type::FloatTy) ? PPC32::LFS : PPC32::LFD;
addConstantPoolReference(BuildMI(*MBB, IP, LoadOpcode, 2, R), CPI);
BuildMI(*MBB, IP, LoadOpcode, 2, R).addImm(0).addReg(Reg2);
} else if (isa<ConstantPointerNull>(C)) {
// Copy zero (null pointer) to the register.
BuildMI(*MBB, IP, PPC32::ADDI, 2, R).addReg(PPC32::R0).addImm(0);
@ -1182,6 +1195,19 @@ void ISel::visitBranchInst(BranchInst &BI) {
}
}
static Constant* minUConstantForValue(uint64_t val) {
if (val <= 1)
return ConstantBool::get(val);
else if (ConstantUInt::isValueValidForType(Type::UShortTy, val))
return ConstantUInt::get(Type::UShortTy, val);
else if (ConstantUInt::isValueValidForType(Type::UIntTy, val))
return ConstantUInt::get(Type::UIntTy, val);
else if (ConstantUInt::isValueValidForType(Type::ULongTy, val))
return ConstantUInt::get(Type::ULongTy, val);
std::cerr << "Value: " << val << " not accepted for any integral type!\n";
abort();
}
/// doCall - This emits an abstract call instruction, setting up the arguments
/// and the return value as appropriate. For the actual function call itself,
@ -1213,6 +1239,7 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
// Arguments go on the stack in reverse order, as specified by the ABI.
unsigned ArgOffset = 0;
int GPR_remaining = 8, FPR_remaining = 13;
unsigned GPR_idx = 0, FPR_idx = 0;
static const unsigned GPR[] = {
PPC32::R3, PPC32::R4, PPC32::R5, PPC32::R6,
PPC32::R7, PPC32::R8, PPC32::R9, PPC32::R10,
@ -1222,7 +1249,6 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
PPC32::F7, PPC32::F8, PPC32::F9, PPC32::F10, PPC32::F11, PPC32::F12,
PPC32::F13
};
unsigned GPR_idx = 0, FPR_idx = 0;
for (unsigned i = 0, e = Args.size(); i != e; ++i) {
unsigned ArgReg;
@ -1277,6 +1303,7 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
case cFP:
ArgReg = Args[i].Val ? getReg(Args[i].Val) : Args[i].Reg;
if (Args[i].Ty == Type::FloatTy) {
assert(!isVarArg && "Cannot pass floats to vararg functions!");
// Reg or stack?
if (FPR_remaining > 0) {
BuildMI(BB, PPC32::FMR, 1, FPR[FPR_idx]).addReg(ArgReg);
@ -1286,7 +1313,6 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
BuildMI(BB, PPC32::STFS, 3).addReg(ArgReg).addImm(ArgOffset)
.addReg(PPC32::R1);
}
assert(!isVarArg && "Cannot pass floats to vararg functions!");
} else {
assert(Args[i].Ty == Type::DoubleTy && "Unknown FP type!");
// Reg or stack?
@ -1296,13 +1322,21 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
FPR_idx++;
// For vararg functions, must pass doubles via int regs as well
if (isVarArg) {
BuildMI(BB, PPC32::STFD, 3).addReg(ArgReg).addImm(ArgOffset)
.addReg(PPC32::R1);
union DU {
double FVal;
struct {
uint32_t hi32;
uint32_t lo32;
} UVal;
} U;
U.FVal = cast<ConstantFP>(Args[i].Val)->getValue();
if (GPR_remaining > 0) {
Constant *hi32 = minUConstantForValue(U.UVal.hi32);
copyConstantToRegister(BB, BB->end(), hi32, GPR[GPR_idx]);
}
if (GPR_remaining > 1) {
BuildMI(BB, PPC32::LWZ, 2, GPR[GPR_idx]).addImm(ArgOffset)
.addReg(PPC32::R1);
BuildMI(BB, PPC32::LWZ, 2, GPR[GPR_idx + 1])
.addImm(ArgOffset+4).addReg(PPC32::R1);
Constant *lo32 = minUConstantForValue(U.UVal.lo32);
copyConstantToRegister(BB, BB->end(), lo32, GPR[GPR_idx+1]);
}
}
} else {
@ -1311,7 +1345,7 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
}
ArgOffset += 4; // 8 byte entry, not 4.
GPR_remaining--; // uses up 2 GPRs
GPR_remaining--; // uses up 2 GPRs
GPR_idx++;
}
break;