diff options
Diffstat (limited to 'docs/users_guide/using-optimisation.rst')
| -rw-r--r-- | docs/users_guide/using-optimisation.rst | 44 |
1 files changed, 21 insertions, 23 deletions
diff --git a/docs/users_guide/using-optimisation.rst b/docs/users_guide/using-optimisation.rst index a962a7f55e..403faa342e 100644 --- a/docs/users_guide/using-optimisation.rst +++ b/docs/users_guide/using-optimisation.rst @@ -1197,16 +1197,16 @@ by saying ``-fno-wombat``. This is the full syntax for cardinalities, demands and sub-demands in BNF: - .. code-block:: + .. code-block:: none - card ::= B | A | 1 | U | S | M semantics as in the table above + card ::= B | A | 1 | U | S | M semantics as in the table above - d ::= card sd card = how often, sd = how deep - | card abbreviation: Same as "card card" + d ::= card sd card = how often, sd = how deep + | card abbreviation: Same as "card card" - sd ::= card polymorphic sub-demand, card at every level - | P(d,d,..) product sub-demand - | Ccard(sd) call sub-demand + sd ::= card polymorphic sub-demand, card at every level + | P(d,d,..) product sub-demand + | Ccard(sd) call sub-demand For example, ``fst`` is strict in its argument, and also in the first component of the argument. It will not evaluate the argument's second @@ -1234,17 +1234,17 @@ by saying ``-fno-wombat``. We summarise a function's demand properties in its *demand signature*. This is the general syntax: - .. code-block:: + .. code-block:: none - {x->dx,y->dy,z->dz...}<d1><d2><d3>...<dn>div - ^ ^ ^ ^ ^ ^ - | | | | | | - | \---+---+------/ | - | | | - demand on free demand on divergence - variables arguments information - (omitted if empty) (omitted if - no information) + {x->dx,y->dy,z->dz...}<d1><d2><d3>...<dn>div + ^ ^ ^ ^ ^ ^ + | | | | | | + | \---+---+------/ | + | | | + demand on free demand on divergence + variables arguments information + (omitted if empty) (omitted if + no information) We summarise ``fst``'s demand properties in its *demand signature* ``<SP(SU,A)>``, which just says "If ``fst`` is applied to one argument, @@ -1260,13 +1260,11 @@ by saying ``-fno-wombat``. **Call sub-demands** - Consider ``maybe``: + Consider ``maybe``: :: - .. code-block:: - - maybe :: b -> (a -> b) -> Maybe a -> b - maybe n _ Nothing = n - maybe _ s (Just a) = s a + maybe :: b -> (a -> b) -> Maybe a -> b + maybe n _ Nothing = n + maybe _ s (Just a) = s a We give it demand signature ``<U><1C1(U)><SU>``. The ``C1(U)`` is a *call sub-demand* that says "Called at most once, where the result is used |