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Live ranges for Return value and return address of a Call are no longer 

created here.  Instead they are created in LiveRangeInfo.cpp.  This
simplifies the code here quite a bit.

llvm-svn: 3965
This commit is contained in:
Vikram S. Adve 2002-09-28 16:59:05 +00:00
parent cce628aeaf
commit 6d1036d41b
1 changed files with 26 additions and 49 deletions
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75
llvm/lib/Target/Sparc/SparcRegInfo.cpp
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@ -351,23 +351,21 @@ void UltraSparcRegInfo::suggestReg4RetAddr(MachineInstr *RetMI,
// Suggests a register for the ret address in the JMPL/CALL machine instr.
// Sparc ABI dictates that %o7 be used for this purpose.
//---------------------------------------------------------------------------
void UltraSparcRegInfo::suggestReg4CallAddr(MachineInstr * CallMI,
LiveRangeInfo& LRI,
std::vector<RegClass *> RCList) const {
void
UltraSparcRegInfo::suggestReg4CallAddr(MachineInstr * CallMI,
LiveRangeInfo& LRI) const
{
CallArgsDescriptor* argDesc = CallArgsDescriptor::get(CallMI);
const Value *RetAddrVal = argDesc->getReturnAddrReg();
assert(RetAddrVal && "Return address value is required");
// create a new LR for the return address and color it
LiveRange * RetAddrLR = new LiveRange();
RetAddrLR->insert( RetAddrVal );
unsigned RegClassID = getRegClassIDOfValue( RetAddrVal );
RetAddrLR->setRegClass( RCList[RegClassID] );
RetAddrLR->setColor(getUnifiedRegNum(IntRegClassID,SparcIntRegClass::o7));
LRI.addLRToMap( RetAddrVal, RetAddrLR);
}
assert(RetAddrVal && "INTERNAL ERROR: Return address value is required");
// A LR must already exist for the return address.
LiveRange *RetAddrLR = LRI.getLiveRangeForValue(RetAddrVal);
assert(RetAddrLR && "INTERNAL ERROR: No LR for return address of call!");
unsigned RegClassID = RetAddrLR->getRegClass()->getID();
RetAddrLR->setColor(getUnifiedRegNum(IntRegClassID, SparcIntRegClass::o7));
}
@ -565,39 +563,24 @@ void UltraSparcRegInfo::colorMethodArgs(const Function *Meth,
// outgoing call args and the return value of the call.
//---------------------------------------------------------------------------
void UltraSparcRegInfo::suggestRegs4CallArgs(MachineInstr *CallMI,
LiveRangeInfo& LRI,
std::vector<RegClass *> RCList) const {
LiveRangeInfo& LRI) const {
assert ( (UltraSparcInfo->getInstrInfo()).isCall(CallMI->getOpCode()) );
CallArgsDescriptor* argDesc = CallArgsDescriptor::get(CallMI);
suggestReg4CallAddr(CallMI, LRI, RCList);
suggestReg4CallAddr(CallMI, LRI);
// First color the return value of the call instruction. The return value
// will be in %o0 if the value is an integer type, or in %f0 if the
// value is a float type.
// First color the return value of the call instruction, if any.
// The return value will be in %o0 if the value is an integer type,
// or in %f0 if the value is a float type.
//
if (const Value *RetVal = argDesc->getReturnValue()) {
LiveRange *RetValLR = LRI.getLiveRangeForValue(RetVal);
assert(RetValLR && "No LR for return Value of call!");
// the return value cannot have a LR in machine instruction since it is
// only defined by the call instruction
unsigned RegClassID = RetValLR->getRegClass()->getID();
// if type is not void, create a new live range and set its
// register class and add to LRI
const Value *RetVal = argDesc->getReturnValue();
if (RetVal) {
assert ((!LRI.getLiveRangeForValue(RetVal)) &&
"LR for ret Value of call already definded!");
// create a new LR for the return value
LiveRange *RetValLR = new LiveRange();
RetValLR->insert(RetVal);
unsigned RegClassID = getRegClassIDOfValue(RetVal);
RetValLR->setRegClass(RCList[RegClassID]);
LRI.addLRToMap(RetVal, RetValLR);
// now suggest a register depending on the register class of ret arg
if( RegClassID == IntRegClassID )
RetValLR->setSuggestedColor(SparcIntRegClass::o0);
else if (RegClassID == FloatRegClassID )
@ -605,7 +588,6 @@ void UltraSparcRegInfo::suggestRegs4CallArgs(MachineInstr *CallMI,
else assert( 0 && "Unknown reg class for return value of call\n");
}
// Now suggest colors for arguments (operands) of the call instruction.
// Colors are suggested only if the arg number is smaller than the
// the number of registers allocated for argument passing.
@ -620,17 +602,12 @@ void UltraSparcRegInfo::suggestRegs4CallArgs(MachineInstr *CallMI,
// get the LR of call operand (parameter)
LiveRange *const LR = LRI.getLiveRangeForValue(CallArg);
// not possible to have a null LR since all args (even consts)
// must be defined before
if (!LR) {
cerr << " ERROR: In call instr, no LR for arg: " << RAV(CallArg) << "\n";
assert(0 && "NO LR for call arg");
}
assert (LR && "Must have a LR for all arguments since "
"all args (even consts) must be defined before");
unsigned regType = getRegType( LR );
unsigned regClassIDOfArgReg = MAXINT; // reg class of chosen reg (unused)
// Choose a register for this arg depending on whether it is
// an INT or FP value. Here we ignore whether or not it is a
// varargs calls, because FP arguments will be explicitly copied