Instruction

Machine registers that are pre-allocated to stgRegs are filtered out, because they are uninteresting from a register allocation standpoint. (We wouldn't want them to end up on the free list!)

As far as we are concerned, the fixed registers simply don't exist (for allocation purposes, anyway).

Constructors

RU [Reg] [Reg]

noUsage :: RegUsage

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No regs read or written to.

type NatCmm instr = GenCmm CmmStatic [CmmStatic] (ListGraph instr)

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type NatCmmTop instr = GenCmmTop CmmStatic [CmmStatic] (ListGraph instr)

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type NatBasicBlock instr = GenBasicBlock instr

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class Instruction instr where

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Common things that we can do with instructions, on all architectures. These are used by the shared parts of the native code generator, specifically the register allocators.

Methods

regUsageOfInstr :: instr -> RegUsage

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Get the registers that are being used by this instruction. regUsage doesn't need to do any trickery for jumps and such. Just state precisely the regs read and written by that insn. The consequences of control flow transfers, as far as register allocation goes, are taken care of by the register allocator.

patchRegsOfInstr :: instr -> (Reg -> Reg) -> instr

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Apply a given mapping to all the register references in this instruction.

isJumpishInstr :: instr -> Bool

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Checks whether this instruction is a jump/branch instruction. One that can change the flow of control in a way that the register allocator needs to worry about.

jumpDestsOfInstr :: instr -> [BlockId]

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Give the possible destinations of this jump instruction. Must be defined for all jumpish instructions.

patchJumpInstr :: instr -> (BlockId -> BlockId) -> instr

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Change the destination of this jump instruction. Used in the linear allocator when adding fixup blocks for join points.

mkSpillInstr

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:: Reg	the reg to spill
-> Int	the current stack delta
-> Int	spill slot to use
-> instr
An instruction to spill a register into a spill slot.

mkLoadInstr

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:: Reg	the reg to reload.
-> Int	the current stack delta
-> Int	the spill slot to use
-> instr
An instruction to reload a register from a spill slot.

takeDeltaInstr :: instr -> Maybe Int

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See if this instruction is telling us the current C stack delta

isMetaInstr :: instr -> Bool

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Check whether this instruction is some meta thing inserted into the instruction stream for other purposes.

Not something that has to be treated as a real machine instruction and have its registers allocated.

eg, comments, delta, ldata, etc.

mkRegRegMoveInstr

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:: Reg	source register
-> Reg	destination register
-> instr
Copy the value in a register to another one. Must work for all register classes.

takeRegRegMoveInstr :: instr -> Maybe (Reg, Reg)

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Take the source and destination from this reg -> reg move instruction or Nothing if it's not one

mkJumpInstr :: BlockId -> [instr]

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Make an unconditional jump instruction. For architectures with branch delay slots, its ok to put a NOP after the jump. Don't fill the delay slot with an instruction that references regs or you'll confuse the linear allocator.

Instances

Instruction Instr

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