Reg
Description
An architecture independent description of a register. This needs to stay architecture independent because it is used by NCGMonad and the register allocators, which are shared by all architectures.
- type RegNo = Int
- data Reg
- = RegVirtual !VirtualReg
- | RegReal !RealReg
- regPair :: RegNo -> RegNo -> Reg
- regSingle :: RegNo -> Reg
- isRealReg :: Reg -> Bool
- takeRealReg :: Reg -> Maybe RealReg
- isVirtualReg :: Reg -> Bool
- takeVirtualReg :: Reg -> Maybe VirtualReg
- data VirtualReg
- = VirtualRegI !Unique
- | VirtualRegHi !Unique
- | VirtualRegF !Unique
- | VirtualRegD !Unique
- | VirtualRegSSE !Unique
- renameVirtualReg :: Unique -> VirtualReg -> VirtualReg
- classOfVirtualReg :: VirtualReg -> RegClass
- getHiVirtualRegFromLo :: VirtualReg -> VirtualReg
- getHiVRegFromLo :: Reg -> Reg
- data RealReg
- = RealRegSingle !RegNo
- | RealRegPair !RegNo !RegNo
- regNosOfRealReg :: RealReg -> [RegNo]
- realRegsAlias :: RealReg -> RealReg -> Bool
- liftPatchFnToRegReg :: (VirtualReg -> RealReg) -> Reg -> Reg
Documentation
type RegNo = Int
An identifier for a primitive real machine register.
takeRealReg :: Reg -> Maybe RealReg
isVirtualReg :: Reg -> Bool
takeVirtualReg :: Reg -> Maybe VirtualReg
data VirtualReg
Constructors
| VirtualRegI !Unique | |
| VirtualRegHi !Unique | |
| VirtualRegF !Unique | |
| VirtualRegD !Unique | |
| VirtualRegSSE !Unique |
renameVirtualReg :: Unique -> VirtualReg -> VirtualReg
getHiVRegFromLo :: Reg -> Reg
data RealReg
RealRegs are machine regs which are available for allocation, in the usual way. We know what class they are, because that's part of the processor's architecture.
RealRegPairs are pairs of real registers that are allocated together to hold a larger value, such as with Double regs on SPARC.
Constructors
| RealRegSingle !RegNo | |
| RealRegPair !RegNo !RegNo |
regNosOfRealReg :: RealReg -> [RegNo]
realRegsAlias :: RealReg -> RealReg -> Bool
liftPatchFnToRegReg :: (VirtualReg -> RealReg) -> Reg -> Reg
The patch function supplied by the allocator maps VirtualReg to RealReg regs, but sometimes we want to apply it to plain old Reg.