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Cleaned up code layout; no functional changes. 

llvm-svn: 6312
This commit is contained in:
Misha Brukman 2003-05-23 19:20:57 +00:00
parent 5d4589ff34
commit 39968bbc46
1 changed files with 20 additions and 24 deletions
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44
llvm/lib/Target/Sparc/PeepholeOpts.cpp
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@ -22,21 +22,19 @@ DeleteInstruction(MachineBasicBlock& mvec,
const TargetMachine& target)
{
// Check if this instruction is in a delay slot of its predecessor.
if (BBI != mvec.begin())
{
if (BBI != mvec.begin()) {
const TargetInstrInfo& mii = target.getInstrInfo();
MachineInstr* predMI = *(BBI-1);
if (unsigned ndelay = mii.getNumDelaySlots(predMI->getOpCode()))
{
// This instruction is in a delay slot of its predecessor, so
// replace it with a nop. By replacing in place, we save having
// to update the I-I maps.
//
assert(ndelay == 1 && "Not yet handling multiple-delay-slot targets");
(*BBI)->replace(mii.getNOPOpCode(), 0);
return;
}
}
if (unsigned ndelay = mii.getNumDelaySlots(predMI->getOpCode())) {
// This instruction is in a delay slot of its predecessor, so
// replace it with a nop. By replacing in place, we save having
// to update the I-I maps.
//
assert(ndelay == 1 && "Not yet handling multiple-delay-slot targets");
(*BBI)->replace(mii.getNOPOpCode(), 0);
return;
}
}
// The instruction is not in a delay slot, so we can simply erase it.
mvec.erase(BBI);
@ -51,11 +49,10 @@ RemoveUselessCopies(MachineBasicBlock& mvec,
MachineBasicBlock::iterator& BBI,
const TargetMachine& target)
{
if (target.getOptInfo().IsUselessCopy(*BBI))
{
DeleteInstruction(mvec, BBI, target);
return true;
}
if (target.getOptInfo().IsUselessCopy(*BBI)) {
DeleteInstruction(mvec, BBI, target);
return true;
}
return false;
}
@ -117,11 +114,11 @@ PeepholeOpts::runOnBasicBlock(BasicBlock &BB)
//
for (MachineBasicBlock::reverse_iterator RI=mvec.rbegin(),
RE=mvec.rend(); RI != RE; )
{
MachineBasicBlock::iterator BBI = RI.base()-1; // save before incr
++RI; // pre-increment to delete MI or after it
visit(mvec, BBI);
}
{
MachineBasicBlock::iterator BBI = RI.base()-1; // save before incr
++RI; // pre-increment to delete MI or after it
visit(mvec, BBI);
}
return true;
}
@ -136,4 +133,3 @@ createPeepholeOptsPass(TargetMachine &T)
{
return new PeepholeOpts(T);
}