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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 3587 fun getEinApp x = (case V.getDef x
35 :     of IR.EINAPP(e, arg) => SOME(e, arg)
36 : jhr 3513 | _ => NONE
37 :     (* end case *))
38 :    
39 : jhr 3520 (* doNormalize : EIN -> EIN
40 : jhr 3513 * Orders EIN, normalizes it, then cleans the summation
41 :     *)
42 : jhr 3517 fun doNormalize e = let
43 : jhr 3515 val ordered = Reorder.transform e
44 : jhr 3513 in
45 : jhr 3520 case NormalizeEin.transform ordered
46 :     of NONE => ordered
47 :     | SOME e => EinSums.clean e
48 :     (* end case *)
49 : jhr 3513 end
50 :    
51 :     fun nameCnt e = String.concat[V.toString e, "(", Int.toString(useCount e), ")"]
52 :     fun nameCnts e = String.concatWithMap "" nameCnt e
53 :    
54 :     (* rewriteEin : EIN.Params*int*int*EIN*HighIR Vars* rhs list* EIN *HighIR Var
55 :     * -> int*EIN*int*rhs list
56 :     * Orders EIN, normalizes it, then cleans the summation orig-original EIN
57 :     *)
58 : jhr 3535 fun rewriteEin (params, place, changed, newE, newArgs, done, newEinApp, orig, lhs) = (
59 :     case List.nth(params, place)
60 : jhr 3548 of Ein.TEN(false, _) => (changed, orig, place+1, done@[newEinApp])
61 : jhr 3513 | _ => let
62 :     val rtnArgs = done @ newArgs
63 : jhr 3521 val (c, subst) = Apply.apply(orig, place, newE)
64 : jhr 3513 in
65 : jhr 3521 if c
66 : jhr 3517 then (true, subst, place + length newArgs, rtnArgs)
67 : jhr 3513 else (
68 : jhr 3517 incUse lhs; List.app incUse newArgs; decUse newEinApp;
69 : jhr 3513 (true, subst, place + length newArgs, rtnArgs))
70 :     end
71 :     (* end case *))
72 :    
73 :     (* doRHS: HighIR.var * rhs -> (var * rhs) list option
74 :     * Looks at each argument to the original EINAPP.
75 : jhr 3535 * If it is another EIN APP calls rewriteEin to do application
76 : jhr 3513 * "place"-The Param-id for the EIN operator.
77 :     * Keeps track of the place of the argument in substitution.
78 :     *)
79 :     fun doRHS (lhs, IR.EINAPP(ein, args)) = let
80 :     fun rewrite (false, _, _, [], _) = NONE
81 :     | rewrite (true, orig, _, [], args') =
82 : jhr 3517 SOME[(lhs, IR.EINAPP(doNormalize orig, args'))]
83 : jhr 3587 | rewrite (changed, orig, place, e::es, args') = (case getEinApp e
84 : jhr 3513 of NONE => rewrite(changed, orig, place+1, es, args'@[e])
85 : jhr 3587 | SOME(newE, newA) => let
86 : jhr 3513 val Ein.EIN{params, index, body} = orig
87 :     val (changed, e', place', done') =
88 :     rewriteEin (params, place, changed, newE, newA, args', e, orig, lhs)
89 :     in
90 :     rewrite(changed, e', place', es, done')
91 :     end
92 :     (* end case *))
93 :     in
94 :     rewrite (false, ein, 0, args, [])
95 :     end
96 :     | doRHS _ = NONE
97 :    
98 :     structure Rewrite = RewriteFn (
99 :     struct
100 :     structure IR = IR
101 :     val doAssign = doRHS
102 :    
103 :     fun doMAssign _ = NONE
104 :     val elimUnusedVars = UnusedElim.reduce
105 :     end)
106 :    
107 : jhr 3615 structure Promote = PromoteFn (IR)
108 : jhr 3513
109 : jhr 3615 val transform = Promote.transform o Rewrite.transform
110 :    
111 : jhr 3513 end

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