Revision c1adf235 src/dimension.ml
src/dimension.ml  

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inst_dim_vars := (dim.dim_id, var)::!inst_dim_vars; 
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var 
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let rec unify dim1 dim2 = 

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let dim1 = repr dim1 in 

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let dim2 = repr dim2 in 

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if dim1.dim_id = dim2.dim_id then () else 

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match dim1.dim_desc, dim2.dim_desc with 

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 Dunivar, _ 

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 _ , Dunivar > assert false 

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 Dvar , Dvar > 

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if dim1.dim_id < dim2.dim_id 

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then dim2.dim_desc < Dlink dim1 

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else dim1.dim_desc < Dlink dim2 

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 Dvar , _ when not (occurs dim1 dim2) > 

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dim1.dim_desc < Dlink dim2 

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 _ , Dvar when not (occurs dim2 dim1) > 

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dim2.dim_desc < Dlink dim1 

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 Dite(i1, t1, e1), Dite(i2, t2, e2) > 

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begin 

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unify i1 i2; 

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unify t1 t2; 

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unify e1 e2 

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end 

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 Dappl(f1, args1), Dappl(f2, args2) when f1 = f2 && List.length args1 = List.length args2 > 

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List.iter2 unify args1 args2 

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 Dbool b1, Dbool b2 when b1 = b2 > () 

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 Dint i1 , Dint i2 when i1 = i2 > () 

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 Dident id1, Dident id2 when id1 = id2 > () 

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 _ > raise (Unify (dim1, dim2)) 

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(* unification with the constraint that dim1 is an instance of dim2 *) 

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let rec semi_unify dim1 dim2 = 

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let dim1 = repr dim1 in 

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let dim2 = repr dim2 in 

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if dim1.dim_id = dim2.dim_id then () else 

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match dim1.dim_desc, dim2.dim_desc with 

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 Dunivar, _ 

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 _ , Dunivar > assert false 

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 Dvar , Dvar > 

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if dim1.dim_id < dim2.dim_id 

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then dim2.dim_desc < Dlink dim1 

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else dim1.dim_desc < Dlink dim2 

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 Dvar , _ > raise (Unify (dim1, dim2)) 

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 _ , Dvar when not (occurs dim2 dim1) > 

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dim2.dim_desc < Dlink dim1 

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 Dite(i1, t1, e1), Dite(i2, t2, e2) > 

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begin 

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semi_unify i1 i2; 

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semi_unify t1 t2; 

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semi_unify e1 e2 

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end 

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 Dappl(f1, args1), Dappl(f2, args2) when f1 = f2 && List.length args1 = List.length args2 > 

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List.iter2 semi_unify args1 args2 

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 Dbool b1, Dbool b2 when b1 = b2 > () 

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 Dint i1 , Dint i2 when i1 = i2 > () 

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 Dident id1, Dident id2 when id1 = id2 > () 

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 _ > raise (Unify (dim1, dim2)) 

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(** destructive unification of [dim1] and [dim2]. 

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Raises [Unify (t1,t2)] if the types are not unifiable. 

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if [semi] unification is required, 

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[dim1] should furthermore be an instance of [dim2] *) 

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let unify ?(semi=false) dim1 dim2 = 

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let rec unif dim1 dim2 = 

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let dim1 = repr dim1 in 

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let dim2 = repr dim2 in 

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if dim1.dim_id = dim2.dim_id then () else 

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match dim1.dim_desc, dim2.dim_desc with 

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 Dunivar, _ 

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 _ , Dunivar > assert false 

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 Dvar , Dvar > 

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if dim1.dim_id < dim2.dim_id 

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then dim2.dim_desc < Dlink dim1 

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else dim1.dim_desc < Dlink dim2 

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 Dvar , _ when (not semi) && not (occurs dim1 dim2) > 

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dim1.dim_desc < Dlink dim2 

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 _ , Dvar when not (occurs dim2 dim1) > 

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dim2.dim_desc < Dlink dim1 

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 Dite(i1, t1, e1), Dite(i2, t2, e2) > 

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begin 

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unif i1 i2; 

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unif t1 t2; 

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unif e1 e2 

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end 

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 Dappl(f1, args1), Dappl(f2, args2) when f1 = f2 && List.length args1 = List.length args2 > 

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List.iter2 unif args1 args2 

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 Dbool b1, Dbool b2 when b1 = b2 > () 

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 Dint i1 , Dint i2 when i1 = i2 > () 

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 Dident id1, Dident id2 when id1 = id2 > () 

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 _ > raise (Unify (dim1, dim2)) 

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in unif dim1 dim2 

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let rec expr_replace_var fvar e = 
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{ e with dim_desc = expr_replace_desc fvar e.dim_desc } 
Also available in: Unified diff