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The main changes are

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Estimated hours taken: 12

The main changes are

1	associating a name with the arguments of constructors

2	removing the follow_vars field from calls, higher-order calls
	and complicated unifications, since they are not used

3	merging the follow_vars and store_alloc passes, since they logically
	belong together

4	add a new module, lco, for detecting opportunities for last
	call optimization modulo constructor application; it won't
	actually apply the optimization until the mode system becomes
	expressive enough to handle it (this module detects 529 opportunities
	in the compiler and library)

5	make "-O3 --optimize-value-number" do the right thing; previously,
	it used not to apply value numbering because the vnrepeat option
	defaulted to zero

6	don't refer to .err2 files anymore; use .err instead.

prog_data:
	The list associated with each value of type "constructor" now
	contains not only the types of the arguments but their names as well.

equiv_type, hlds_data, hlds_out, make_hlds, mercury_to_{goedel,mercury},
mode_util, module_qual, shapes, type_util, unify_proc:
	Modify the traversal of type definitions to account for the names
	in the lists inside values of type "constructor".

prog_io:
	Parse argument names. An unrelated change is that we now
	check whether :- pred declarations give modes to some of their
	arguments but not to all, in which case we return an error.

hlds_goal:
	Remove the follow_vars field from calls, higher-order calls
	and complicated unifications.

*.m:
	Handle the new arities of calls, higher order calls and complicated
	unifications.

mercury_compile:
	Don't call follow_vars directly anymore, but do call lco if its option
	is set. Also flush the main output before a call to maybe_report_stats
	to prevent ugly output.

store_alloc:
	Call follow_vars directly.

follow_vars:
	Expose the initialization and traversal predicates for store_alloc.

lco:
	Find opportunities for last call optimization modulo constructor
	application.

passes_aux:
	Add a HLDS traversal type for lco.

optimize:
	Consider the vnrepeat count to be zero unless value numbering is on.

options:
	Set the default value of vnrepeat to 1.

modules:
	Don't refer to .err2 files.
This commit is contained in:
Zoltan Somogyi
1996-11-04 06:26:51 +00:00
parent abda46ff9f
commit 5d64b759db
53 changed files with 663 additions and 403 deletions
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4
compiler/code_util.m
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@@ -475,8 +475,8 @@ code_util__goal_may_allocate_heap(Goal - _GoalInfo) :-
:- pred code_util__goal_may_allocate_heap_2(hlds__goal_expr).
:- mode code_util__goal_may_allocate_heap_2(in) is semidet.
code_util__goal_may_allocate_heap_2(higher_order_call(_, _, _, _, _, _)).
code_util__goal_may_allocate_heap_2(call(_, _, _, Builtin, _, _, _)) :-
code_util__goal_may_allocate_heap_2(higher_order_call(_, _, _, _, _)).
code_util__goal_may_allocate_heap_2(call(_, _, _, Builtin, _, _)) :-
\+ hlds__is_builtin_is_inline(Builtin).
code_util__goal_may_allocate_heap_2(unify(_, _, _, construct(_,_,Args,_), _)) :-
Args = [_|_].