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We were forgetting to add FP_REG_KILL instructions to basic blocks which will

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eventually get an assignment due to elimination of PHIs.

llvm-svn: 11743
This commit is contained in:
Chris Lattner 2004-02-23 07:29:45 +00:00
parent 74418a30aa
commit 28e4e925eb
1 changed files with 27 additions and 15 deletions
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42
lib/Target/X86/InstSelectSimple.cpp
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@ -688,23 +688,35 @@ void ISel::InsertFPRegKills() {
if (I->getOperand(i).isRegister()) {
unsigned Reg = I->getOperand(i).getReg();
if (MRegisterInfo::isVirtualRegister(Reg))
if (RegMap.getRegClass(Reg)->getSize() == 10) {
UsesFPReg = true;
break;
}
if (RegMap.getRegClass(Reg)->getSize() == 10)
goto UsesFPReg;
}
// If we haven't found an FP register use or def in this basic block, check
// to see if any of our successors has an FP PHI node, which will cause a
// copy to be inserted into this block.
if (!UsesFPReg)
for (succ_const_iterator SI = succ_begin(BB->getBasicBlock()),
E = succ_end(BB->getBasicBlock()); SI != E; ++SI) {
MachineBasicBlock *SBB = MBBMap[*SI];
for (MachineBasicBlock::iterator I = SBB->begin();
I != SBB->end() && I->getOpcode() == X86::PHI; ++I) {
if (RegMap.getRegClass(I->getOperand(0).getReg())->getSize() == 10)
goto UsesFPReg;
}
if (UsesFPReg) {
// Okay, this block uses an FP register. If the block has successors (ie,
// it's not an unwind/return), insert the FP_REG_KILL instruction.
if (BB->getBasicBlock()->getTerminator()->getNumSuccessors() &&
RequiresFPRegKill(BB->getBasicBlock())) {
// Rewind past any terminator instructions that might exist.
MachineBasicBlock::iterator I = BB->end();
while (I != BB->begin() && TII.isTerminatorInstr((--I)->getOpcode()));
++I;
BMI(BB, I, X86::FP_REG_KILL, 0);
++NumFPKill;
}
continue;
UsesFPReg:
// Okay, this block uses an FP register. If the block has successors (ie,
// it's not an unwind/return), insert the FP_REG_KILL instruction.
if (BB->getBasicBlock()->getTerminator()->getNumSuccessors() &&
RequiresFPRegKill(BB->getBasicBlock())) {
// Rewind past any terminator instructions that might exist.
MachineBasicBlock::iterator I = BB->end();
while (I != BB->begin() && TII.isTerminatorInstr((--I)->getOpcode()));
++I;
BMI(BB, I, X86::FP_REG_KILL, 0);
++NumFPKill;
}
}
}