diff options
Diffstat (limited to 'include/llvm/CodeGen/MachineRegisterInfo.h')
| -rw-r--r-- | include/llvm/CodeGen/MachineRegisterInfo.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h index 5eeaa28747..db9352ff88 100644 --- a/include/llvm/CodeGen/MachineRegisterInfo.h +++ b/include/llvm/CodeGen/MachineRegisterInfo.h @@ -215,13 +215,15 @@ public: void setRegClass(unsigned Reg, const TargetRegisterClass *RC); /// constrainRegClass - Constrain the register class of the specified virtual - /// register to be a common subclass of RC and the current register class. - /// Return the new register class, or NULL if no such class exists. + /// register to be a common subclass of RC and the current register class, + /// but only if the new class has at least MinNumRegs registers. Return the + /// new register class, or NULL if no such class exists. /// This should only be used when the constraint is known to be trivial, like /// GR32 -> GR32_NOSP. Beware of increasing register pressure. /// const TargetRegisterClass *constrainRegClass(unsigned Reg, - const TargetRegisterClass *RC); + const TargetRegisterClass *RC, + unsigned MinNumRegs = 0); /// recomputeRegClass - Try to find a legal super-class of Reg's register /// class that still satisfies the constraints from the instructions using |