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|
{-# OPTIONS -fno-warn-tabs #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and
-- detab the module (please do the detabbing in a separate patch). See
-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
-- for details
module RegAlloc.Linear.FreeRegs (
FR(..),
maxSpillSlots
)
#include "HsVersions.h"
where
import Reg
import RegClass
import Panic
import Platform
-- -----------------------------------------------------------------------------
-- The free register set
-- This needs to be *efficient*
-- Here's an inefficient 'executable specification' of the FreeRegs data type:
--
-- type FreeRegs = [RegNo]
-- noFreeRegs = 0
-- releaseReg n f = if n `elem` f then f else (n : f)
-- initFreeRegs = allocatableRegs
-- getFreeRegs cls f = filter ( (==cls) . regClass . RealReg ) f
-- allocateReg f r = filter (/= r) f
import qualified RegAlloc.Linear.PPC.FreeRegs as PPC
import qualified RegAlloc.Linear.SPARC.FreeRegs as SPARC
import qualified RegAlloc.Linear.X86.FreeRegs as X86
import qualified PPC.Instr
import qualified SPARC.Instr
import qualified X86.Instr
class Show freeRegs => FR freeRegs where
frAllocateReg :: RealReg -> freeRegs -> freeRegs
frGetFreeRegs :: RegClass -> freeRegs -> [RealReg]
frInitFreeRegs :: freeRegs
frReleaseReg :: RealReg -> freeRegs -> freeRegs
instance FR X86.FreeRegs where
frAllocateReg = X86.allocateReg
frGetFreeRegs = X86.getFreeRegs
frInitFreeRegs = X86.initFreeRegs
frReleaseReg = X86.releaseReg
instance FR PPC.FreeRegs where
frAllocateReg = PPC.allocateReg
frGetFreeRegs = PPC.getFreeRegs
frInitFreeRegs = PPC.initFreeRegs
frReleaseReg = PPC.releaseReg
instance FR SPARC.FreeRegs where
frAllocateReg = SPARC.allocateReg
frGetFreeRegs = SPARC.getFreeRegs
frInitFreeRegs = SPARC.initFreeRegs
frReleaseReg = SPARC.releaseReg
maxSpillSlots :: Platform -> Int
maxSpillSlots platform
= case platformArch platform of
ArchX86 -> X86.Instr.maxSpillSlots True -- 32bit
ArchX86_64 -> X86.Instr.maxSpillSlots False -- not 32bit
ArchPPC -> PPC.Instr.maxSpillSlots
ArchSPARC -> SPARC.Instr.maxSpillSlots
ArchARM _ _ _ -> panic "maxSpillSlots ArchARM"
ArchPPC_64 -> panic "maxSpillSlots ArchPPC_64"
ArchUnknown -> panic "maxSpillSlots ArchUnknown"
|
