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module RegAlloc.Linear.FreeRegs (
FreeRegs(),
noFreeRegs,
releaseReg,
initFreeRegs,
getFreeRegs,
allocateReg,
maxSpillSlots
)
#include "HsVersions.h"
where
-- -----------------------------------------------------------------------------
-- 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
#if defined(powerpc_TARGET_ARCH)
import RegAlloc.Linear.PPC.FreeRegs
import PPC.Instr (maxSpillSlots)
#elif defined(sparc_TARGET_ARCH)
import RegAlloc.Linear.SPARC.FreeRegs
import SPARC.Instr (maxSpillSlots)
#elif defined(i386_TARGET_ARCH) || defined(x86_64_TARGET_ARCH)
import RegAlloc.Linear.X86.FreeRegs
import X86.Instr (maxSpillSlots)
#else
#error "RegAlloc.Linear.FreeRegs not defined for this architecture."
#endif
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