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Add support for copying bool constants to registers.

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Disable the code that copies long constants to registers - it looks fishy.
Implement some simple casts: integral, smaller than longs, and equal-width
 or narrowing only.

llvm-svn: 13413
This commit is contained in:
Brian Gaeke 2004-05-07 21:39:30 +00:00
parent 67c21e74ec
commit 0d477a958f
1 changed files with 35 additions and 7 deletions
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40
lib/Target/SparcV8/InstSelectSimple.cpp
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@ -181,10 +181,15 @@ static TypeClass getClassB(const Type *T) {
void V8ISel::copyConstantToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
Constant *C, unsigned R) {
if (ConstantInt *CI = dyn_cast<ConstantInt> (C)) {
unsigned Class = getClass(C->getType());
uint64_t Val = CI->getRawValue ();
switch (Class) {
if (C->getType()->isIntegral ()) {
uint64_t Val;
if (C->getType() == Type::BoolTy) {
Val = (C == ConstantBool::True);
} else {
ConstantInt *CI = dyn_cast<ConstantInt> (C);
Val = CI->getRawValue ();
}
switch (getClassB (C->getType ())) {
case cByte:
BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (V8::G0).addImm((uint8_t)Val);
return;
@ -207,12 +212,17 @@ void V8ISel::copyConstantToRegister(MachineBasicBlock *MBB,
unsigned TmpReg = makeAnotherReg (Type::UIntTy);
uint32_t topHalf = (uint32_t) (Val >> 32);
uint32_t bottomHalf = (uint32_t)Val;
#if 0 // FIXME: This does not appear to be correct; it assigns SSA reg R twice.
BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addImm (topHalf >> 10);
BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
.addImm (topHalf & 0x03ff);
BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addImm (bottomHalf >> 10);
BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
.addImm (bottomHalf & 0x03ff);
#else
std::cerr << "Offending constant: " << *C << "\n";
assert (0 && "Can't copy this kind of constant into register yet");
#endif
return;
}
default:
@ -285,12 +295,30 @@ bool V8ISel::runOnFunction(Function &Fn) {
void V8ISel::visitCastInst(CastInst &I) {
unsigned SrcReg = getReg (I.getOperand (0));
unsigned DestReg = getReg (I.getOperand (0));
unsigned DestReg = getReg (I);
const Type *oldTy = I.getOperand (0)->getType ();
const Type *newTy = I.getType ();
unsigned oldTyClass = getClassB (oldTy);
unsigned newTyClass = getClassB (newTy);
std::cerr << "Cast instruction not supported: " << I;
if (oldTyClass < cLong && newTyClass < cLong && oldTyClass >= newTyClass) {
// Emit a reg->reg copy to do a equal-size or non-narrowing cast,
// and do sign/zero extension (necessary if we change signedness).
unsigned TempReg1 = makeAnotherReg (newTy);
unsigned TempReg2 = makeAnotherReg (newTy);
BuildMI (BB, V8::ORrr, 2, TempReg1).addReg (V8::G0).addReg (SrcReg);
unsigned shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (newTy));
BuildMI (BB, V8::SLLri, 2, TempReg2).addZImm (shiftWidth).addReg (TempReg1);
if (newTy->isSigned ()) { // sign-extend with SRA
BuildMI(BB, V8::SRAri, 2, DestReg).addZImm (shiftWidth).addReg (TempReg2);
} else { // zero-extend with SRL
BuildMI(BB, V8::SRLri, 2, DestReg).addZImm (shiftWidth).addReg (TempReg2);
}
} else {
std::cerr << "Casts w/ long, fp, double, or widening still unsupported: "
<< I;
abort ();
}
}
void V8ISel::visitLoadInst(LoadInst &I) {