ghc-6.12.1: The GHC APIContentsIndex
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.
Synopsis
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
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.
data Reg
A register, either virtual or real
Constructors
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
Constructors
VirtualRegI !Unique
VirtualRegHi !Unique
VirtualRegF !Unique
VirtualRegD !Unique
renameVirtualReg :: Unique -> VirtualReg -> VirtualReg
classOfVirtualReg :: VirtualReg -> RegClass
getHiVirtualRegFromLo :: 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.
Produced by Haddock version 2.6.0