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Don't use getNextOperandForReg() in RAFast.

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That particular optimization was probably premature anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161541 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-08-08 23:44:01 +00:00
parent 12864689d1
commit 4e6966266a
1 changed files with 4 additions and 8 deletions
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12
lib/CodeGen/RegAllocFast.cpp
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@ -201,20 +201,16 @@ int RAFast::getStackSpaceFor(unsigned VirtReg, const TargetRegisterClass *RC) {
/// its virtual register, and it is guaranteed to be a block-local register.
///
bool RAFast::isLastUseOfLocalReg(MachineOperand &MO) {
// Check for non-debug uses or defs following MO.
// This is the most likely way to fail - fast path it.
MachineOperand *Next = &MO;
while ((Next = Next->getNextOperandForReg()))
if (!Next->isDebug())
return false;
// If the register has ever been spilled or reloaded, we conservatively assume
// it is a global register used in multiple blocks.
if (StackSlotForVirtReg[MO.getReg()] != -1)
return false;
// Check that the use/def chain has exactly one operand - MO.
return &MRI->reg_nodbg_begin(MO.getReg()).getOperand() == &MO;
MachineRegisterInfo::reg_nodbg_iterator I = MRI->reg_nodbg_begin(MO.getReg());
if (&I.getOperand() != &MO)
return false;
return ++I == MRI->reg_nodbg_end();
}
/// addKillFlag - Set kill flags on last use of a virtual register.