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RegisterPressure: Use range based for, cleanup 

llvm-svn: 250579
This commit is contained in:
Matthias Braun 2015-10-16 23:25:09 +00:00
parent 80c94a7856
commit fdee8ec2bd
1 changed files with 7 additions and 14 deletions
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21
llvm/lib/CodeGen/RegisterPressure.cpp
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@ -882,19 +882,13 @@ getUpwardPressureDelta(const MachineInstr *MI, /*const*/ PressureDiff &PDiff,
}
/// Helper to find a vreg use between two indices [PriorUseIdx, NextUseIdx).
static bool findUseBetween(unsigned Reg,
SlotIndex PriorUseIdx, SlotIndex NextUseIdx,
const MachineRegisterInfo *MRI,
static bool findUseBetween(unsigned Reg, SlotIndex PriorUseIdx,
SlotIndex NextUseIdx, const MachineRegisterInfo &MRI,
const LiveIntervals *LIS) {
for (MachineRegisterInfo::use_instr_nodbg_iterator
UI = MRI->use_instr_nodbg_begin(Reg),
UE = MRI->use_instr_nodbg_end(); UI != UE; ++UI) {
const MachineInstr* MI = &*UI;
if (MI->isDebugValue())
continue;
SlotIndex InstSlot = LIS->getInstructionIndex(MI).getRegSlot();
if (InstSlot >= PriorUseIdx && InstSlot < NextUseIdx)
return true;
for (const MachineInstr &MI : MRI.use_nodbg_instructions(Reg)) {
SlotIndex InstSlot = LIS->getInstructionIndex(&MI).getRegSlot();
if (InstSlot >= PriorUseIdx && InstSlot < NextUseIdx)
return true;
}
return false;
}
@ -927,9 +921,8 @@ void RegPressureTracker::bumpDownwardPressure(const MachineInstr *MI) {
const LiveRange *LR = getLiveRange(Reg);
if (LR) {
LiveQueryResult LRQ = LR->Query(SlotIdx);
if (LRQ.isKill() && !findUseBetween(Reg, CurrIdx, SlotIdx, MRI, LIS)) {
if (LRQ.isKill() && !findUseBetween(Reg, CurrIdx, SlotIdx, *MRI, LIS))
decreaseRegPressure(Reg);
}
}
}
else if (!TargetRegisterInfo::isVirtualRegister(Reg)) {