diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCSE.cpp | 4 | ||||
| -rw-r--r-- | llvm/lib/CodeGen/MachineRegisterInfo.cpp | 7 |
2 files changed, 9 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp index 32e57a9f938..aaac6ad9336 100644 --- a/llvm/lib/CodeGen/MachineCSE.cpp +++ b/llvm/lib/CodeGen/MachineCSE.cpp @@ -250,8 +250,8 @@ bool MachineCSE::hasLivePhysRegDefUses(const MachineInstr *MI, continue; if (TargetRegisterInfo::isVirtualRegister(Reg)) continue; - // Reading constant physregs is ok. - if (!MRI->isConstantPhysReg(Reg)) + // Reading either caller preserved or constant physregs is ok. + if (!MRI->isCallerPreservedOrConstPhysReg(Reg)) for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) PhysRefs.insert(*AI); } diff --git a/llvm/lib/CodeGen/MachineRegisterInfo.cpp b/llvm/lib/CodeGen/MachineRegisterInfo.cpp index 84d130fae3c..dfa0a4af334 100644 --- a/llvm/lib/CodeGen/MachineRegisterInfo.cpp +++ b/llvm/lib/CodeGen/MachineRegisterInfo.cpp @@ -487,6 +487,13 @@ bool MachineRegisterInfo::isConstantPhysReg(unsigned PhysReg) const { return true; } +bool +MachineRegisterInfo::isCallerPreservedOrConstPhysReg(unsigned PhysReg) const { + const TargetRegisterInfo *TRI = getTargetRegisterInfo(); + return isConstantPhysReg(PhysReg) || + TRI->isCallerPreservedPhysReg(PhysReg, *MF); +} + /// markUsesInDebugValueAsUndef - Mark every DBG_VALUE referencing the /// specified register as undefined which causes the DBG_VALUE to be /// deleted during LiveDebugVariables analysis. |
