Documentation

data FreeRegs Source

Constructors

FreeRegs !Word32 !Word32 !Word32

Instances

Show FreeRegs

noFreeRegs :: FreeRegs Source

A reg map where no regs are free to be allocated.

initFreeRegs :: FreeRegs Source

The initial set of free regs.

getFreeRegs :: RegClass -> FreeRegs -> [RealReg]Source

Get all the free registers of this class.

allocateReg :: RealReg -> FreeRegs -> FreeRegs Source

Grab a register.

releaseReg :: RealReg -> FreeRegs -> FreeRegs Source

Release a register from allocation. The register liveness information says that most regs die after a C call, but we still don't want to allocate to some of them.

bitMask :: Int -> Word32 Source

showFreeRegs :: FreeRegs -> String Source