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Simplify this code by using LiveVariables::KillsRegister

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22988 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-23 22:49:55 +00:00
parent 20647a55bf
commit 76eb08bcda
1 changed files with 11 additions and 35 deletions

46
lib/Target/X86/X86FloatingPoint.cpp

@ -422,10 +422,7 @@ void FPS::handleOneArgFP(MachineBasicBlock::iterator &I) {
// Is this the last use of the source register?
unsigned Reg = getFPReg(MI->getOperand(MI->getNumOperands()-1));
bool KillsSrc = false;
for (LiveVariables::killed_iterator KI = LV->killed_begin(MI),
E = LV->killed_end(MI); KI != E; ++KI)
KillsSrc |= KI->second == X86::FP0+Reg;
bool KillsSrc = LV->KillsRegister(MI, X86::FP0+Reg);
// FSTP80r and FISTP64r are strange because there are no non-popping versions.
// If we have one _and_ we don't want to pop the operand, duplicate the value
@ -463,10 +460,7 @@ void FPS::handleOneArgFPRW(MachineBasicBlock::iterator &I) {
// Is this the last use of the source register?
unsigned Reg = getFPReg(MI->getOperand(1));
bool KillsSrc = false;
for (LiveVariables::killed_iterator KI = LV->killed_begin(MI),
E = LV->killed_end(MI); KI != E; ++KI)
KillsSrc |= KI->second == X86::FP0+Reg;
bool KillsSrc = LV->KillsRegister(MI, X86::FP0+Reg);
if (KillsSrc) {
// If this is the last use of the source register, just make sure it's on
@ -541,13 +535,8 @@ void FPS::handleTwoArgFP(MachineBasicBlock::iterator &I) {
unsigned Dest = getFPReg(MI->getOperand(0));
unsigned Op0 = getFPReg(MI->getOperand(NumOperands-2));
unsigned Op1 = getFPReg(MI->getOperand(NumOperands-1));
bool KillsOp0 = false, KillsOp1 = false;
for (LiveVariables::killed_iterator KI = LV->killed_begin(MI),
E = LV->killed_end(MI); KI != E; ++KI) {
KillsOp0 |= (KI->second == X86::FP0+Op0);
KillsOp1 |= (KI->second == X86::FP0+Op1);
}
bool KillsOp0 = LV->KillsRegister(MI, X86::FP0+Op0);
bool KillsOp1 = LV->KillsRegister(MI, X86::FP0+Op1);
unsigned TOS = getStackEntry(0);
@ -642,13 +631,8 @@ void FPS::handleCompareFP(MachineBasicBlock::iterator &I) {
assert(NumOperands == 2 && "Illegal FUCOM* instruction!");
unsigned Op0 = getFPReg(MI->getOperand(NumOperands-2));
unsigned Op1 = getFPReg(MI->getOperand(NumOperands-1));
bool KillsOp0 = false, KillsOp1 = false;
for (LiveVariables::killed_iterator KI = LV->killed_begin(MI),
E = LV->killed_end(MI); KI != E; ++KI) {
KillsOp0 |= (KI->second == X86::FP0+Op0);
KillsOp1 |= (KI->second == X86::FP0+Op1);
}
bool KillsOp0 = LV->KillsRegister(MI, X86::FP0+Op0);
bool KillsOp1 = LV->KillsRegister(MI, X86::FP0+Op1);
// Make sure the first operand is on the top of stack, the other one can be
// anywhere.
@ -680,14 +664,10 @@ void FPS::handleCondMovFP(MachineBasicBlock::iterator &I) {
MI->getOperand(0).setReg(getSTReg(Op1));
// If we kill the second operand, make sure to pop it from the stack.
if (Op0 != Op1)
for (LiveVariables::killed_iterator KI = LV->killed_begin(MI),
E = LV->killed_end(MI); KI != E; ++KI)
if (KI->second == X86::FP0+Op1) {
// Get this value off of the register stack.
freeStackSlotAfter(I, Op1);
break;
}
if (Op0 != Op1 && LV->KillsRegister(MI, X86::FP0+Op1)) {
// Get this value off of the register stack.
freeStackSlotAfter(I, Op1);
}
}
@ -710,12 +690,8 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
case X86::FpMOV: {
unsigned SrcReg = getFPReg(MI->getOperand(1));
unsigned DestReg = getFPReg(MI->getOperand(0));
bool KillsSrc = false;
for (LiveVariables::killed_iterator KI = LV->killed_begin(MI),
E = LV->killed_end(MI); KI != E; ++KI)
KillsSrc |= KI->second == X86::FP0+SrcReg;
if (KillsSrc) {
if (LV->KillsRegister(MI, X86::FP0+SrcReg)) {
// If the input operand is killed, we can just change the owner of the
// incoming stack slot into the result.
unsigned Slot = getSlot(SrcReg);