diff options
Diffstat (limited to 'llvm/lib/CodeGen/MachineLICM.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineLICM.cpp | 15 |
1 files changed, 1 insertions, 14 deletions
diff --git a/llvm/lib/CodeGen/MachineLICM.cpp b/llvm/lib/CodeGen/MachineLICM.cpp index e7c28434490..77ea4f37f85 100644 --- a/llvm/lib/CodeGen/MachineLICM.cpp +++ b/llvm/lib/CodeGen/MachineLICM.cpp @@ -81,8 +81,6 @@ namespace { MachineLoop *CurLoop; // The current loop we are working on. MachineBasicBlock *CurPreheader; // The preheader for CurLoop. - BitVector AllocatableSet; - // Track 'estimated' register pressure. SmallSet<unsigned, 32> RegSeen; SmallVector<unsigned, 8> RegPressure; @@ -331,7 +329,6 @@ bool MachineLICM::runOnMachineFunction(MachineFunction &MF) { MFI = MF.getFrameInfo(); MRI = &MF.getRegInfo(); InstrItins = TM->getInstrItineraryData(); - AllocatableSet = TRI->getAllocatableSet(MF); if (PreRegAlloc) { // Estimate register pressure during pre-regalloc pass. @@ -905,18 +902,8 @@ bool MachineLICM::IsLoopInvariantInst(MachineInstr &I) { // If the physreg has no defs anywhere, it's just an ambient register // and we can freely move its uses. Alternatively, if it's allocatable, // it could get allocated to something with a def during allocation. - if (!MRI->def_empty(Reg)) - return false; - if (AllocatableSet.test(Reg)) + if (!MRI->isConstantPhysReg(Reg, *I.getParent()->getParent())) return false; - // Check for a def among the register's aliases too. - for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) { - unsigned AliasReg = *Alias; - if (!MRI->def_empty(AliasReg)) - return false; - if (AllocatableSet.test(AliasReg)) - return false; - } // Otherwise it's safe to move. continue; } else if (!MO.isDead()) { |
