diff options
Diffstat (limited to 'lib/CodeGen/RegAllocLocal.cpp')
-rw-r--r-- | lib/CodeGen/RegAllocLocal.cpp | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp index 94456d1438..a3d2f9d2c2 100644 --- a/lib/CodeGen/RegAllocLocal.cpp +++ b/lib/CodeGen/RegAllocLocal.cpp @@ -843,8 +843,18 @@ void RALocal::AllocateBasicBlock(MachineBasicBlock &MBB) { SmallVector<unsigned, 8> Kills; for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { MachineOperand &MO = MI->getOperand(i); - if (!MO.isReg() || !MO.isKill()) continue; - + if (!MO.isReg()) continue; + unsigned Reg = MO.getReg(); + if (!Reg) continue; + + // Avoid allocating assigned early clobbers below. + if (MO.isEarlyClobber() && TargetRegisterInfo::isPhysicalRegister(Reg)) { + spillPhysReg(MBB, MI, Reg, true); // Spill any existing value in reg + PhysRegsUsed[Reg] = 0; // It is free and reserved now + AddToPhysRegsUseOrder(Reg); + } + + if (!MO.isKill()) continue; if (!MO.isImplicit()) Kills.push_back(MO.getReg()); else if (!isReadModWriteImplicitKill(MI, MO.getReg())) |