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Use a small local function for a single remaining late isMoveInstr call in

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Thumb2ITBlockPass.

llvm-svn: 108564
This commit is contained in:
Jakob Stoklund Olesen 2010-07-16 22:35:32 +00:00
parent e2833a21c2
commit d073973e61
1 changed files with 40 additions and 22 deletions
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62
lib/Target/ARM/Thumb2ITBlockPass.cpp
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@ -91,35 +91,53 @@ static void TrackDefUses(MachineInstr *MI,
}
}
static bool isCopy(MachineInstr *MI) {
switch (MI->getOpcode()) {
default:
return false;
case ARM::MOVr:
case ARM::MOVr_TC:
case ARM::tMOVr:
case ARM::tMOVgpr2tgpr:
case ARM::tMOVtgpr2gpr:
case ARM::tMOVgpr2gpr:
case ARM::t2MOVr:
return true;
}
}
bool
Thumb2ITBlockPass::MoveCopyOutOfITBlock(MachineInstr *MI,
ARMCC::CondCodes CC, ARMCC::CondCodes OCC,
SmallSet<unsigned, 4> &Defs,
SmallSet<unsigned, 4> &Uses) {
unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
if (TII->isMoveInstr(*MI, SrcReg, DstReg, SrcSubIdx, DstSubIdx)) {
assert(SrcSubIdx == 0 && DstSubIdx == 0 &&
"Sub-register indices still around?");
// llvm models select's as two-address instructions. That means a copy
// is inserted before a t2MOVccr, etc. If the copy is scheduled in
// between selects we would end up creating multiple IT blocks.
if (!isCopy(MI))
return false;
// llvm models select's as two-address instructions. That means a copy
// is inserted before a t2MOVccr, etc. If the copy is scheduled in
// between selects we would end up creating multiple IT blocks.
assert(MI->getOperand(0).getSubReg() == 0 &&
MI->getOperand(1).getSubReg() == 0 &&
"Sub-register indices still around?");
// First check if it's safe to move it.
if (Uses.count(DstReg) || Defs.count(SrcReg))
return false;
unsigned DstReg = MI->getOperand(0).getReg();
unsigned SrcReg = MI->getOperand(1).getReg();
// Then peek at the next instruction to see if it's predicated on CC or OCC.
// If not, then there is nothing to be gained by moving the copy.
MachineBasicBlock::iterator I = MI; ++I;
MachineBasicBlock::iterator E = MI->getParent()->end();
while (I != E && I->isDebugValue())
++I;
if (I != E) {
unsigned NPredReg = 0;
ARMCC::CondCodes NCC = llvm::getITInstrPredicate(I, NPredReg);
if (NCC == CC || NCC == OCC)
return true;
}
// First check if it's safe to move it.
if (Uses.count(DstReg) || Defs.count(SrcReg))
return false;
// Then peek at the next instruction to see if it's predicated on CC or OCC.
// If not, then there is nothing to be gained by moving the copy.
MachineBasicBlock::iterator I = MI; ++I;
MachineBasicBlock::iterator E = MI->getParent()->end();
while (I != E && I->isDebugValue())
++I;
if (I != E) {
unsigned NPredReg = 0;
ARMCC::CondCodes NCC = llvm::getITInstrPredicate(I, NPredReg);
if (NCC == CC || NCC == OCC)
return true;
}
return false;
}