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Implement casting a floating point to 32-bit unsigned value

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15143 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-07-23 20:32:59 +00:00
parent 204fa53528
commit b160d1f9f7
2 changed files with 122 additions and 4 deletions
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63
lib/Target/PowerPC/PPC32ISelSimple.cpp
View File

@ -2672,8 +2672,67 @@ void ISel::emitCastOperation(MachineBasicBlock *MBB,
ValueFrameIdx, 4); ValueFrameIdx, 4);
} }
} else { } else {
std::cerr << "ERROR: Cast fp-to-unsigned not implemented!\n"; unsigned Zero = getReg(ConstantFP::get(Type::DoubleTy, 0.0f));
abort(); double maxInt = (1LL << 32) - 1;
unsigned MaxInt = getReg(ConstantFP::get(Type::DoubleTy, maxInt));
double border = 1LL << 31;
unsigned Border = getReg(ConstantFP::get(Type::DoubleTy, border));
unsigned UseZero = makeAnotherReg(Type::DoubleTy);
unsigned UseMaxInt = makeAnotherReg(Type::DoubleTy);
unsigned UseChoice = makeAnotherReg(Type::DoubleTy);
unsigned TmpReg = makeAnotherReg(Type::DoubleTy);
unsigned TmpReg2 = makeAnotherReg(Type::DoubleTy);
unsigned ConvReg = makeAnotherReg(Type::DoubleTy);
unsigned IntTmp = makeAnotherReg(Type::IntTy);
unsigned XorReg = makeAnotherReg(Type::IntTy);
int FrameIdx =
F->getFrameInfo()->CreateStackObject(SrcTy, TM.getTargetData());
// Update machine-CFG edges
MachineBasicBlock *XorMBB = new MachineBasicBlock(BB->getBasicBlock());
MachineBasicBlock *PhiMBB = new MachineBasicBlock(BB->getBasicBlock());
MachineBasicBlock *OldMBB = BB;
ilist<MachineBasicBlock>::iterator It = BB; ++It;
F->getBasicBlockList().insert(It, XorMBB);
F->getBasicBlockList().insert(It, PhiMBB);
BB->addSuccessor(XorMBB);
BB->addSuccessor(PhiMBB);
// Convert from floating point to unsigned 32-bit value
// Use 0 if incoming value is < 0.0
BuildMI(*BB, IP, PPC32::FSEL, 3, UseZero).addReg(SrcReg).addReg(SrcReg)
.addReg(Zero);
// Use 2**32 - 1 if incoming value is >= 2**32
BuildMI(*BB, IP, PPC32::FSUB, 2, UseMaxInt).addReg(MaxInt).addReg(SrcReg);
BuildMI(*BB, IP, PPC32::FSEL, 3, UseChoice).addReg(UseMaxInt)
.addReg(UseZero).addReg(MaxInt);
// Subtract 2**31
BuildMI(*BB, IP, PPC32::FSUB, 2, TmpReg).addReg(UseChoice).addReg(Border);
// Use difference if >= 2**31
BuildMI(*BB, IP, PPC32::FCMPU, 2, PPC32::CR0).addReg(UseChoice)
.addReg(Border);
BuildMI(*BB, IP, PPC32::FSEL, 3, TmpReg2).addReg(TmpReg).addReg(TmpReg)
.addReg(UseChoice);
// Convert to integer
BuildMI(*BB, IP, PPC32::FCTIWZ, 1, ConvReg).addReg(TmpReg2);
addFrameReference(BuildMI(*BB, IP, PPC32::STFD, 3).addReg(ConvReg),
FrameIdx);
addFrameReference(BuildMI(*BB, IP, PPC32::LWZ, 2, IntTmp),
FrameIdx, 4);
BuildMI(*BB, IP, PPC32::BLT, 2).addReg(PPC32::CR0).addMBB(PhiMBB);
BuildMI(*BB, IP, PPC32::B, 1).addMBB(XorMBB);
// XorMBB:
// add 2**31 if input was >= 2**31
BB = XorMBB;
BuildMI(BB, PPC32::XORIS, 2, XorReg).addReg(IntTmp).addImm(0x8000);
BuildMI(BB, PPC32::B, 1).addMBB(PhiMBB);
XorMBB->addSuccessor(PhiMBB);
// PhiMBB:
// DestReg = phi [ IntTmp, OldMBB ], [ XorReg, XorMBB ]
BB = PhiMBB;
BuildMI(BB, PPC32::PHI, 2, DestReg).addReg(IntTmp).addMBB(OldMBB)
.addReg(XorReg).addMBB(XorMBB);
} }
return; return;
} }

63
lib/Target/PowerPC/PowerPCISelSimple.cpp
View File

@ -2672,8 +2672,67 @@ void ISel::emitCastOperation(MachineBasicBlock *MBB,
ValueFrameIdx, 4); ValueFrameIdx, 4);
} }
} else { } else {
std::cerr << "ERROR: Cast fp-to-unsigned not implemented!\n"; unsigned Zero = getReg(ConstantFP::get(Type::DoubleTy, 0.0f));
abort(); double maxInt = (1LL << 32) - 1;
unsigned MaxInt = getReg(ConstantFP::get(Type::DoubleTy, maxInt));
double border = 1LL << 31;
unsigned Border = getReg(ConstantFP::get(Type::DoubleTy, border));
unsigned UseZero = makeAnotherReg(Type::DoubleTy);
unsigned UseMaxInt = makeAnotherReg(Type::DoubleTy);
unsigned UseChoice = makeAnotherReg(Type::DoubleTy);
unsigned TmpReg = makeAnotherReg(Type::DoubleTy);
unsigned TmpReg2 = makeAnotherReg(Type::DoubleTy);
unsigned ConvReg = makeAnotherReg(Type::DoubleTy);
unsigned IntTmp = makeAnotherReg(Type::IntTy);
unsigned XorReg = makeAnotherReg(Type::IntTy);
int FrameIdx =
F->getFrameInfo()->CreateStackObject(SrcTy, TM.getTargetData());
// Update machine-CFG edges
MachineBasicBlock *XorMBB = new MachineBasicBlock(BB->getBasicBlock());
MachineBasicBlock *PhiMBB = new MachineBasicBlock(BB->getBasicBlock());
MachineBasicBlock *OldMBB = BB;
ilist<MachineBasicBlock>::iterator It = BB; ++It;
F->getBasicBlockList().insert(It, XorMBB);
F->getBasicBlockList().insert(It, PhiMBB);
BB->addSuccessor(XorMBB);
BB->addSuccessor(PhiMBB);
// Convert from floating point to unsigned 32-bit value
// Use 0 if incoming value is < 0.0
BuildMI(*BB, IP, PPC32::FSEL, 3, UseZero).addReg(SrcReg).addReg(SrcReg)
.addReg(Zero);
// Use 2**32 - 1 if incoming value is >= 2**32
BuildMI(*BB, IP, PPC32::FSUB, 2, UseMaxInt).addReg(MaxInt).addReg(SrcReg);
BuildMI(*BB, IP, PPC32::FSEL, 3, UseChoice).addReg(UseMaxInt)
.addReg(UseZero).addReg(MaxInt);
// Subtract 2**31
BuildMI(*BB, IP, PPC32::FSUB, 2, TmpReg).addReg(UseChoice).addReg(Border);
// Use difference if >= 2**31
BuildMI(*BB, IP, PPC32::FCMPU, 2, PPC32::CR0).addReg(UseChoice)
.addReg(Border);
BuildMI(*BB, IP, PPC32::FSEL, 3, TmpReg2).addReg(TmpReg).addReg(TmpReg)
.addReg(UseChoice);
// Convert to integer
BuildMI(*BB, IP, PPC32::FCTIWZ, 1, ConvReg).addReg(TmpReg2);
addFrameReference(BuildMI(*BB, IP, PPC32::STFD, 3).addReg(ConvReg),
FrameIdx);
addFrameReference(BuildMI(*BB, IP, PPC32::LWZ, 2, IntTmp),
FrameIdx, 4);
BuildMI(*BB, IP, PPC32::BLT, 2).addReg(PPC32::CR0).addMBB(PhiMBB);
BuildMI(*BB, IP, PPC32::B, 1).addMBB(XorMBB);
// XorMBB:
// add 2**31 if input was >= 2**31
BB = XorMBB;
BuildMI(BB, PPC32::XORIS, 2, XorReg).addReg(IntTmp).addImm(0x8000);
BuildMI(BB, PPC32::B, 1).addMBB(PhiMBB);
XorMBB->addSuccessor(PhiMBB);
// PhiMBB:
// DestReg = phi [ IntTmp, OldMBB ], [ XorReg, XorMBB ]
BB = PhiMBB;
BuildMI(BB, PPC32::PHI, 2, DestReg).addReg(IntTmp).addMBB(OldMBB)
.addReg(XorReg).addMBB(XorMBB);
} }
return; return;
} }