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82eab0e65e
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Add an optional pass that tries to avoid generating too many parallel goals.
The first transformation implemented by this pass is to transform parallel
conjunctions into goals of the form
( queues already contain lot of work ->
sequential version of parallel conjunction
;
parallel conjunction as before
)
if they contain recursive calls.
The effect of this transformation is to reduce the overhead of the new par_fib
test case from:
fib(35): sequential 189 vs parallel 5770
to
fib(35): sequential 189 vs parallel 1090
i.e. a speedup of more than a factor of five.
compiler/granularity.m:
New module that implements this transformation. I intend to add other,
more sophisticated transformations in the future.
compiler/transform_hlds.m:
Add granularity.m as one of the submodules of transform_hlds.m.
compiler/mercury_compile.m:
Invoke the new pass.
Invoke dep_par_conj only if needed.
Fix some stage numbers.
compiler/notes/compiler_design.html:
Document the new module.
Document some modules that should have been documented earlier.
Fix a hurried deletion of a reference to the Aditi backend.
compiler/goal_util.m:
Add some utility functions for use by the new module.
compiler/simplify.m:
Record the information mercury_compile.m needs in order to check
whether we have any parallelism for granularity.m and dep_par_conj.m
to process.
compiler/hlds_module.m:
Add a slot to the module_info to record the information from
simplify.m. Clean up some interfaces.
compiler/add_type.m:
Conform to the change to hlds_module.m.
compiler/dependency_graph.m:
Delete unnecessary module qualifications, and rename some predicates
to avoid potential ambiguities.
compiler/options.m:
Add the options required for controlling the new transformation.
Rename an option's internal name to avoid conflict with a language
keyword (the user-visible name remains unchanged).
Move some options around to put them in logical groups.
doc/user_guide.texi:
Document the new options.
Fix some omissions in some earlier options.
compiler/handle_options.m:
compiler/termination.m:
Conform to the option rename.
compiler/quantification.m:
Rename some predicates to avoid ambiguities.
library/par_builtin.m:
Add a predicate for use by the new transformation.
tests/par_conj/par_fib.{m,exp}:
A new test case: a version of fib for use in testing parallelism.
tests/par_conj/Mmakefile:
Enable the new test case.
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