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|
(* sparcSpillInstr.sml
*
* COPYRIGHT (c) 2002 Bell Labs, Lucent Technologies
*
* Sparc instructions to emit when spilling an instruction.
*)
functor SparcSpillInstr(Instr : SPARCINSTR) : ARCH_SPILL_INSTR = struct
structure I = Instr
structure C = I.C
structure Rewrite = SparcRewrite(I)
structure CB = CellsBasis
fun error msg = MLRiscErrorMsg.error ("SparcSpillInstr", msg)
fun storeAtEA CB.GP (reg, I.Displace{base, disp, mem}) =
I.store{s=I.ST, r=base, i=I.LAB disp, d=reg, mem=mem}
| storeAtEA CB.FP (reg, I.Displace{base, disp, mem}) =
I.fstore{s=I.STDF, r=base, i=I.LAB disp, d=reg, mem=mem}
| storeAtEA _ _ = error "storeAtEA"
fun loadFromEA CB.GP (reg, I.Displace{base, disp, mem}) =
I.load{l=I.LD, d=reg, r=base, i=I.LAB disp, mem=mem}
| loadFromEA CB.FP (reg, I.Displace{base, disp, mem}) =
I.fload{l=I.LDDF, d=reg, r=base, i=I.LAB disp, mem=mem}
| loadFromEA _ _ = error "loadFromEA"
fun spillToEA ck reg_ea =
{code=[storeAtEA ck reg_ea], proh=[], newReg=NONE}
fun reloadFromEA ck reg_ea =
{code=[loadFromEA ck reg_ea], proh=[], newReg=NONE}
(* spill a register to spillLoc *)
fun spillR (instr, reg, spillLoc) = let
val newR = C.newReg()
val instr' = Rewrite.rewriteDef(instr, reg, newR)
in
{code=[instr', storeAtEA CB.GP (newR, spillLoc)],
proh=[newR],
newReg=SOME newR}
end
fun spillF (instr, reg, spillLoc) = let
val newR = C.newFreg()
val instr' = Rewrite.frewriteDef(instr, reg, newR)
in
{code=[instr', storeAtEA CB.FP (newR, spillLoc)],
proh=[newR],
newReg=SOME newR}
end
(* reload a register from spillLoc *)
fun reloadR(instr, reg, spillLoc) = let
val newR = C.newReg()
val instr' = Rewrite.rewriteUse(instr, reg, newR)
in
{code=[loadFromEA CB.GP (newR, spillLoc), instr'],
proh=[newR],
newReg=SOME newR}
end
fun reloadF(instr, reg, spillLoc) = let
val newR = C.newFreg()
val instr' = Rewrite.frewriteUse(instr, reg, newR)
in
{code=[loadFromEA CB.FP (newR, spillLoc), instr'],
proh=[newR],
newReg=SOME newR}
end
fun spill CellsBasis.GP = spillR
| spill CellsBasis.FP = spillF
| spill _ = error "spill"
fun reload CellsBasis.GP = reloadR
| reload CellsBasis.FP = reloadF
| reload _ = error "reload"
end
|
