unify_gen:
Whenever we do a test of a variable against a non-constant functor,
we now try to turn it into a negated test on a constant functor.
This is possible if these two functors are the only ones.
code_aux:
Added an extra predicate to look up type definitions to make the
previous change easier.
llds, code_gen, opt_util, opt_debug, frameopt, jumpopt, peephole:
Added a boolean argument to do_succeed to say whether the nondet
frame should be discarded on success or not. The default is no,
but peephole has an optimization that tries to turn on this flag.
optimize, value_number, vn*:
Restructured the top level of value numbering as part of an effort
to identify blocks that could be optimized further given our knowledge
that the contents of e.g. stackvars is also in registers when we
jump to those blocks. Redone the interface between value_number and
frameopt to allow value_number to be iterated, which is necessary
to take advantage of the previously mentioned capability. Threated
the I/O state through the relevant predicates; value numbering doesn't
use non-logical I/O any more.
Makefile.common:
Add new targets `mercury_compile.sicstus' (the Mercury compiler
compiled with Sicstus) and `mercury_compile.sicstus.debug'
(debugging version of the above).
*.nl:
Use Sicstus-compatible char and string escapes.
Avoid the use of explicit existential quantification.
Various other hacks to get things to parse correctly under Sicstus.
prog_io.nl:
Don't allow (A -> B) in DCGs, since NU-Prolog and Mercury give
it different semantics to Sicstus.
sp_builtin.nl, sp_lib.nl:
Split sp_builtin.nl into sp_builtin.nl and sp_lib.nl.
sp_conv.sed:
Add sed script which converts some character escapes so that
they work with Sicstus.
term_io.nl:
Remove term_io__prefix_op etc. since they aren't used anymore.
value_number, vn_util, opt_util, opt_debug:
Fixed a bug with allowed incr_hp to overwrite its target without saving
it. Reorganized the handling of incr_sp and decr_sp to make sure they
never get reordered with respect to control flow instructions.
llds:
Fixed the output of temp declarations for blocks.
frameopt:
Generalized the set up patterns accepted as starting a det procedure.
labelopt:
Added a source-level option to remove eliminated instructions instead
of turning them into comments, and made it the default.
optimize:
After value numbering, perform jump optimization as well as peepholing
and label optimization.
mercury_compile:
Added back an old garbage collection point.
optimize:
Added some new garbage collection points, and made the file into .pp.
value_number, vn_util, opt_debug:
Changed the way access vns are counted. Pushed noop vnlvals towards
the front of the flush order; this can improve the speed of the
generated code.
middle_rec:
Clarified a bit of code.
