compiler/*:
Add copyright messages.
Change all occurences of *.nl in comments to *.m.
compiler/mercury_compile.pp:
Change the output to the .dep files to use *.m rather than *.nl.
(NOTE: this means that `mmake' will not work any more if you
call your files *.nl!!!)
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.
now in dense_switch, string_switch and tag_switch, with the original
if-then-else implementation and the code that decides on optimizations
still in switch_gen.
Added options to replace the magic numbers governing the choice of switch
method.
Added comments to frameopt, jumpopt, labelopt and peephole.
- optimize.nl is the main loop of the optimizer. It calls functions in
jumpopt, peephole, labelopt, frameopt and value_number.
- jumpopt.nl does short-circuiting of jumps to jumps and finds tailcalls.
- peephole.nl now just does the local pattern-match optimizations.
- labelopt.nl eliminates dead labels and dead code.
Renamed the options related to optimization.
*** IMPORTANT: the --optimize flag now enables optimize.nl, not C optimization.
C optimization is signalled via the -c-optimize flag. Both flags are on by
default.
