diff options
Diffstat (limited to 'include/llvm/CodeGen/MachineRegisterInfo.h')
| -rw-r--r-- | include/llvm/CodeGen/MachineRegisterInfo.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h index 670640a715..46731978fd 100644 --- a/include/llvm/CodeGen/MachineRegisterInfo.h +++ b/include/llvm/CodeGen/MachineRegisterInfo.h @@ -357,14 +357,13 @@ public: //===--------------------------------------------------------------------===// /// isPhysRegUsed - Return true if the specified register is used in this - /// function. This only works after register allocation. + /// function. Also check for clobbered aliases and registers clobbered by + /// function calls with register mask operands. + /// + /// This only works after register allocation. It is primarily used by + /// PrologEpilogInserter to determine which callee-saved registers need + /// spilling. bool isPhysRegUsed(unsigned Reg) const { - return UsedPhysRegs.test(Reg) || UsedPhysRegMask.test(Reg); - } - - /// isPhysRegOrOverlapUsed - Return true if Reg or any overlapping register - /// is used in this function. - bool isPhysRegOrOverlapUsed(unsigned Reg) const { if (UsedPhysRegMask.test(Reg)) return true; for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) |