diff options
| -rw-r--r-- | include/llvm/Target/MRegisterInfo.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/llvm/Target/MRegisterInfo.h b/include/llvm/Target/MRegisterInfo.h index 6d53d51456..da111e6ce6 100644 --- a/include/llvm/Target/MRegisterInfo.h +++ b/include/llvm/Target/MRegisterInfo.h @@ -284,6 +284,17 @@ public: return false; } + /// regsOverlap - Returns true if the two registers are equal or alias + /// each other. The registers may be virtual register. + bool regsOverlap(unsigned regA, unsigned regB) const { + if (regA == regB) + return true; + + if (isVirtualRegister(regA) || isVirtualRegister(regB)) + return false; + return areAliases(regA, regB); + } + /// getCalleeSavedRegs - Return a null-terminated list of all of the /// callee saved registers on this target. The register should be in the /// order of desired callee-save stack frame offset. The first register is @@ -295,6 +306,12 @@ public: /// length of this list match the getCalleeSaveRegs() list. virtual const TargetRegisterClass* const *getCalleeSavedRegClasses() const =0; + /// getReservedRegs - Returns a bitset indexed by physical register number + /// indicating if a register is a special register that has particular uses and + /// should be considered unavailable at all times, e.g. SP, RA. This is used by + /// register scavenger to determine what registers are free. + virtual BitVector getReservedRegs(const MachineFunction &MF) const = 0; + //===--------------------------------------------------------------------===// // Register Class Information // |