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[diderot] Diff of /trunk/src/compiler/fields/shape.sml
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Diff of /trunk/src/compiler/fields/shape.sml

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revision 348, Wed Sep 22 15:52:48 2010 UTC revision 349, Fri Sep 24 00:24:20 2010 UTC
# Line 3  Line 3 
3   * COPYRIGHT (c) 2010 The Diderot Project (http://diderot.cs.uchicago.edu)   * COPYRIGHT (c) 2010 The Diderot Project (http://diderot.cs.uchicago.edu)
4   * All rights reserved.   * All rights reserved.
5   *   *
6   * A tree representation of the shape of a tensor.  The height of the tree   * A tree representation of the shape of a tensor (or loop nest).  The height
7   * corresponds to the order of the tensor plus one.  I.e., a 0-order tensor   * of the tree corresponds to the order of the tensor (or nesting depth) plus
8   * is represented by a leaf, a 1-order tensor will be ND(_, [LF _, ..., LF _]),   * one.  I.e., a 0-order tensor is represented by a leaf, a 1-order tensor
9   * etc.   * will be ND(_, [LF _, ..., LF _]), etc.
10   *)   *)
11    
12  structure Shape =  structure Shape : sig
13    struct  
14        datatype ('nd, 'lf) shape
15          = LF of 'lf
16          | ND of ('nd * ('nd, 'lf) shape list)
17    
18      (* create (depth, wid, labelNd, f, labelLf, root)
19       *)
20        val create : int * int * ('a -> 'nd) * (int * 'a -> 'a) * ('a -> 'lf) * 'a -> ('nd, 'lf) shape
21    
22        val map : ('a -> 'b) * ('c -> 'd) -> ('a,'c) shape -> ('b,'d) shape
23    
24        val foldr : ('a * 'b -> 'b) -> 'b -> ('c,'a) shape -> 'b
25    
26      end = struct
27    
28      datatype ('nd, 'lf) shape      datatype ('nd, 'lf) shape
29        = LF of 'lf        = LF of 'lf
# Line 36  Line 49 
49            fun fold (LF x, acc) = f(x, acc)            fun fold (LF x, acc) = f(x, acc)
50              | fold (ND(_, kids), acc) = List.foldr fold acc kids              | fold (ND(_, kids), acc) = List.foldr fold acc kids
51            in            in
52              fold t              fold (t, init)
53            end            end
54    
55    end    end

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