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[diderot] Annotation of /branches/vis15/src/compiler/high-opt/normalize.sml
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Annotation of /branches/vis15/src/compiler/high-opt/normalize.sml

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1 : jhr 3513 (* normalize.sml
2 :     *
3 :     * This code is part of the Diderot Project (http://diderot-language.cs.uchicago.edu)
4 :     *
5 :     * COPYRIGHT (c) 2015 The University of Chicago
6 :     * All rights reserved.
7 :     *)
8 :    
9 :     structure Normalize : sig
10 :    
11 :     val transform : HighIR.program -> HighIR.program
12 :    
13 :     end = struct
14 :    
15 :     structure IR = HighIR
16 :     structure Op = HighOps
17 :     structure V = IR.Var
18 : jhr 3517 structure ST = Stats
19 : jhr 3513
20 : jhr 3517 (********** Counters for statistics **********)
21 :     val cntUnused = ST.newCounter "high-opt:unused"
22 :    
23 : jhr 3513 structure UnusedElim = UnusedElimFn (
24 :     structure IR = IR
25 :     val cntUnused = cntUnused)
26 :    
27 :     fun useCount (IR.V{useCnt, ...}) = !useCnt
28 :    
29 :     (* adjust a variable's use count *)
30 :     fun incUse (IR.V{useCnt, ...}) = (useCnt := !useCnt + 1)
31 :     fun decUse (IR.V{useCnt, ...}) = (useCnt := !useCnt - 1)
32 :     fun use x = (incUse x; x)
33 :    
34 : jhr 4132 (*** OLD VERSION
35 : jhr 3587 fun getEinApp x = (case V.getDef x
36 :     of IR.EINAPP(e, arg) => SOME(e, arg)
37 : jhr 3513 | _ => NONE
38 :     (* end case *))
39 : jhr 4132 ****)
40 :     (* get the EIN application that "x" is bound to (if any). Note that we are conservative
41 :     * on following globals so as to avoid duplicating computation.
42 :     *)
43 :     fun getEinApp x = let
44 :     fun getEinRHS (IR.EINAPP app) = SOME app
45 :     | getEinRHS _ = NONE
46 :     in
47 :     case V.ty x
48 :     of HighTypes.KernelTy => getEinRHS(V.getDef x)
49 :     | HighTypes.FieldTy => getEinRHS(V.getDef x)
50 :     | _ => getEinRHS(V.getLocalDef x)
51 :     (* end case *)
52 :     end
53 : jhr 3513
54 : jhr 3520 (* doNormalize : EIN -> EIN
55 : jhr 3513 * Orders EIN, normalizes it, then cleans the summation
56 :     *)
57 : cchiw 3978 fun doNormalize e' = let
58 : cchiw 4138 val _ =print(String.concat["\n\n\n do normalize:", EinPP.toString(e')])
59 : cchiw 3978 val ordered = Reorder.transform e'
60 : jhr 3513 in
61 : jhr 3520 case NormalizeEin.transform ordered
62 :     of NONE => ordered
63 : cchiw 4138 | SOME e => (print(String.concat["\n transform :=>", EinPP.toString(e)]) ; EinSums.clean e)
64 : jhr 3520 (* end case *)
65 : jhr 3513 end
66 :    
67 :     fun nameCnt e = String.concat[V.toString e, "(", Int.toString(useCount e), ")"]
68 :     fun nameCnts e = String.concatWithMap "" nameCnt e
69 :    
70 :     (* rewriteEin : EIN.Params*int*int*EIN*HighIR Vars* rhs list* EIN *HighIR Var
71 :     * -> int*EIN*int*rhs list
72 : jhr 4080 * Orders EIN, normalizes it, then cleans the summation orig-original EIN
73 : jhr 3513 *)
74 : jhr 3535 fun rewriteEin (params, place, changed, newE, newArgs, done, newEinApp, orig, lhs) = (
75 :     case List.nth(params, place)
76 : jhr 4088 of Ein.TEN(false, _) => (
77 :     incUse lhs; incUse newEinApp;
78 : cchiw 4087 (changed, orig, place+1, done@[newEinApp]))
79 : jhr 3513 | _ => let
80 :     val rtnArgs = done @ newArgs
81 : jhr 3521 val (c, subst) = Apply.apply(orig, place, newE)
82 : cchiw 4138 val _ =print(String.concat["\n\n\n after substition:", EinPP.toString(subst)])
83 : jhr 3513 in
84 : jhr 3521 if c
85 : jhr 3517 then (true, subst, place + length newArgs, rtnArgs)
86 : jhr 3513 else (
87 : jhr 3517 incUse lhs; List.app incUse newArgs; decUse newEinApp;
88 : jhr 3513 (true, subst, place + length newArgs, rtnArgs))
89 :     end
90 :     (* end case *))
91 :    
92 : jhr 4132 (* FIXME: it would be much more efficient to do all of the substitutions in one go,
93 :     * instead of repeatedly rewriting the term for each argument.
94 :     *)
95 : jhr 3513 (* doRHS: HighIR.var * rhs -> (var * rhs) list option
96 :     * Looks at each argument to the original EINAPP.
97 : jhr 3535 * If it is another EIN APP calls rewriteEin to do application
98 : jhr 3513 * "place"-The Param-id for the EIN operator.
99 :     * Keeps track of the place of the argument in substitution.
100 :     *)
101 :     fun doRHS (lhs, IR.EINAPP(ein, args)) = let
102 : cchiw 4138 val _ =print(String.concat["\n\n\n doRHS:", EinPP.toString(ein)])
103 : jhr 3513 fun rewrite (false, _, _, [], _) = NONE
104 :     | rewrite (true, orig, _, [], args') =
105 : jhr 3517 SOME[(lhs, IR.EINAPP(doNormalize orig, args'))]
106 : jhr 3587 | rewrite (changed, orig, place, e::es, args') = (case getEinApp e
107 : jhr 3513 of NONE => rewrite(changed, orig, place+1, es, args'@[e])
108 : jhr 3587 | SOME(newE, newA) => let
109 : jhr 3513 val Ein.EIN{params, index, body} = orig
110 :     val (changed, e', place', done') =
111 :     rewriteEin (params, place, changed, newE, newA, args', e, orig, lhs)
112 :     in
113 :     rewrite(changed, e', place', es, done')
114 :     end
115 :     (* end case *))
116 :     in
117 :     rewrite (false, ein, 0, args, [])
118 :     end
119 :     | doRHS _ = NONE
120 :    
121 :     structure Rewrite = RewriteFn (
122 :     struct
123 :     structure IR = IR
124 :     val doAssign = doRHS
125 :    
126 :     fun doMAssign _ = NONE
127 :     val elimUnusedVars = UnusedElim.reduce
128 :     end)
129 :    
130 : jhr 3615 structure Promote = PromoteFn (IR)
131 : jhr 3513
132 : jhr 3615 val transform = Promote.transform o Rewrite.transform
133 :    
134 : jhr 4084 (*DEBUG*
135 : jhr 4032 fun transform prog = let
136 :     val prog = Rewrite.transform prog
137 :     val _ = HighPP.output(Log.logFile(), "AFTER REWRITE", prog)
138 :     val prog = Promote.transform prog
139 :     val _ = HighPP.output(Log.logFile(), "AFTER PROMOTE", prog)
140 :     in
141 :     prog
142 :     end
143 : jhr 4084 *DEBUG*)
144 : jhr 4032
145 : jhr 3513 end

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