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|
(* alphaJumps.sml --- information to resolve jumps.
*
* COPYRIGHT (c) 1996 Bell Laboratories.
*
*)
functor AlphaJumps
(structure Instr : ALPHAINSTR
structure Shuffle : ALPHASHUFFLE
where I = Instr
structure MLTreeEval : MLTREE_EVAL
where T = Instr.T
) : SDI_JUMPS =
struct
structure I = Instr
structure C = I.C
structure Const = I.Constant
structure Eval = MLTreeEval
structure CB = CellsBasis
fun error msg = MLRiscErrorMsg.error("AlphaJumps",msg)
val branchDelayedArch = false
fun isSdi(I.ANNOTATION{i,...}) = isSdi i
| isSdi(I.LIVE _) = true
| isSdi(I.KILL _) = true
| isSdi(I.COPY _) = true
| isSdi(I.INSTR i) =
(case i
of (I.LDA{d=I.LABop _, ...}) => true
| (I.LOAD{d=I.LABop _, ...}) => true
| (I.STORE{d=I.LABop _, ...}) => true
| (I.FSTORE{d=I.LABop _, ...}) => true
| (I.FLOAD{d=I.LABop _, ...}) => true
| (I.OPERATE{rb=I.LABop _, ...}) => true
| (I.OPERATEV{rb=I.LABop _, ...})=> true
| (I.CMOVE{rb=I.LABop _, ...}) => true
| _ => false
(*esac*))
fun minSize(I.LIVE _) = 0
| minSize(I.KILL _) = 0
| minSize(I.COPY _) = 0
| minSize(I.ANNOTATION{i,...}) = minSize i
| minSize _ = 4
(* max Size is not used for the alpha span dependency analysis. *)
fun maxSize _ = error "maxSize"
fun immed16 n = ~32768 <= n andalso n < 32768
fun im16load n = if immed16 n then 4 else 8
fun im16Oper le = if immed16 (Eval.valueOf le) then 4 else 12
fun immed8 n = n >= 0 andalso n < 256
fun im8Oper le = if immed8 (Eval.valueOf le) then 4 else 12
fun sdiSize(I.ANNOTATION{i,...},x,y) = sdiSize(i,x,y)
| sdiSize(I.LIVE _, _, _) = 0
| sdiSize(I.KILL _, _, _) = 0
| sdiSize(I.COPY{k=CB.GP, src, dst, tmp, ...}, _, _) =
4 * length(Shuffle.shuffle{tmp=tmp, dst=dst, src=src})
| sdiSize(I.COPY{k=CB.FP, src, dst, tmp, ...}, _, _) =
4 * length(Shuffle.shufflefp{src=src, dst=dst, tmp=tmp})
| sdiSize(I.INSTR instr, _, _) =
(case instr
of (I.LDA{d=I.LABop le, ...}) => im16load(Eval.valueOf le)
| (I.LOAD{d=I.LABop le, ...}) => im16Oper le
| (I.STORE{d=I.LABop le, ...}) => im16Oper le
| (I.FLOAD{d=I.LABop le, ...}) => im16Oper le
| (I.FSTORE{d=I.LABop le, ...}) => im16Oper le
| (I.OPERATE{rb=I.LABop le, ...}) => im8Oper le
| (I.OPERATEV{rb=I.LABop le, ...}) => im8Oper le
| (I.CMOVE{rb=I.LABop le, ...}) => im8Oper le
| _ => error "sdiSize"
(*easc*))
| sdiSize _ = error "sdiSize"
(* NOTE: All sdis must use a dedicated physical register as a
* temporaries, since sdi expansion is performed after register
* allocation.
*)
val zeroR = Option.valOf(C.zeroReg CellsBasis.GP)
fun caseSize 4 { four, twelf } = four ()
| caseSize 12 { four, twelf } = twelf ()
| caseSize sz _ = error ("caseSize " ^ Int.toString sz)
fun expand(I.ANNOTATION{i,...}, size, pos) = expand(i,size,pos)
| expand(I.LIVE _, _, _) = []
| expand(I.KILL _, _, _) = []
| expand(I.COPY{k=CB.GP, src, tmp, dst, ...}, _, _) =
Shuffle.shuffle{src=src, dst=dst, tmp=tmp}
| expand(I.COPY{k=CB.FP, src, tmp, dst, ...}, _, _) =
Shuffle.shufflefp{src=src, dst=dst, tmp=tmp}
| expand(I.INSTR instr, size, pos) = let
fun load(ldClass, ldOp, r, b, d as I.LABop le, mem) =
caseSize size
{ four = fn () =>
[ldClass{ldOp=ldOp, r=r, b=b,
d=I.IMMop(Eval.valueOf le), mem=mem}],
twelf = fn () => let
val instrs = expand(I.lda{r=r, b=b, d=d}, 8, pos)
in instrs @ [ldClass{ldOp=ldOp, r=r, b=r,
d=I.IMMop 0, mem=mem}]
end }
| load _ = error "store"
fun store(stClass, stOp, r, b, d as I.LABop le, mem) =
caseSize size
{ four = fn () =>
[stClass{stOp=stOp, r=r, b=b,
d=I.IMMop(Eval.valueOf le), mem=mem}],
twelf = fn () => let
val instrs = expand(I.lda{r=C.asmTmpR, b=b, d=d}, 8, pos)
in instrs @ [stClass{stOp=stOp, r=r, b=C.asmTmpR,
d=I.IMMop 0, mem=mem}]
end }
| store _ = error "store"
fun operate(opClass, oper, ra, rb as I.LABop le, rc) =
caseSize size
{ four = fn () =>
[opClass{oper=oper, ra=ra,
rb=I.IMMop(Eval.valueOf le), rc=rc}],
twelf = fn () => let
val instrs = expand(I.lda{r=C.asmTmpR, b=zeroR, d=rb}, 8, pos)
in instrs @ [opClass{oper=oper, ra=ra,
rb=I.REGop C.asmTmpR, rc=rc}]
end }
| operate _ = error "operate"
in
case instr
of I.LDA{r=rd, b=rs, d=I.LABop le} =>
(case size of
4 => [I.lda{r=rd, b=rs, d=I.LOLABop le}]
| 8 => [I.lda{r=rd, b=rs, d=I.LOLABop le},
I.ldah{r=rd, b=rd, d=I.HILABop le}]
| _ => error "expand:LDA"
)
| I.LOAD{ldOp, r, b, d, mem} => load(I.load, ldOp, r, b, d, mem)
| I.FLOAD{ldOp, r, b, d, mem} => load(I.fload, ldOp, r, b, d, mem)
| I.STORE{stOp, r, b, d, mem} => store(I.store, stOp, r, b, d, mem)
| I.FSTORE{stOp, r, b, d, mem} => store(I.fstore, stOp, r, b, d, mem)
| I.OPERATE{oper, ra, rb, rc} => operate(I.operate, oper, ra, rb, rc)
| I.OPERATEV{oper, ra, rb, rc} => operate(I.operatev, oper, ra, rb, rc)
| I.CMOVE{oper, ra, rb, rc} =>
caseSize size
{ four = fn () => [I.INSTR instr],
twelf = fn () => let
val instrs = expand(I.lda{r=C.asmTmpR, b=zeroR, d=rb},
8, pos)
in instrs @ [I.cmove{oper=oper, ra=ra,
rb=I.REGop C.asmTmpR, rc=rc}]
end }
| _ => error "expand"
end
| expand _ = error "expand"
end
|
