# Changes between Initial Version and Version 1 of Commentary/Compiler/StrictnessAnalysis/Examples

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11/15/06 05:44:59 (7 years ago)
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start examples page

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• ## Commentary/Compiler/StrictnessAnalysis/Examples

v1 v1
1= Strictness analysis: examples =
2
3Consider:
4
5{{{
6f g True = 3
7f g False = g 1 2
8
9...f (\ x -> let foo = somethingExpensive in \ y -> ...)...
10}}}
11
12We want to make sure to figure out that f's argument is demanded with type L1X(L1X(LMX)) -- that is, it may or may not be demanded, but if it is, it's always applied to two arguments. This shows why {{{deferType}}} shouldn't just throw away the argument info: in this case, the {{{(\ x -> ...)}}} expression has a nonstrict demand placed on it, yet we still care about the arguments.
13
14On the other hand, in:
15{{{
16foo x y =
17  case x of
18     A -> \ z -> x*z
19     B -> \ z -> x+z
20}}}
21we want to say that if the result of {{{foo}}} has demand {{{S}}} placed on it (i.e., not a call demand), the body of {{{foo}}} has demand {{{S}}} placed on it, not {{{S(LMX)}}}. So this case needs to be treated differently from the one above.