[m-dev.] diff: enable eager code generator

[Zoltan Somogyi]

Benchmarks I have done recently confirm the results I got earlier on unfinished
versions of the eager code generator: the eager code generator generates better
code at all optimization levels except those involving value numbering. I
believe the reason for that is that value numbering generates code that stores
values in temporary registers tempN, while the eager code generator only uses 
the usual Mercury abstract machine registers rN. This can be significant on
x86s, since we have only one real rN register on that platform. (I will look
into using tempN registers later.)

Accordingly, after the benchmark results here is a diff to enable the eager
code generator where appropriate.

Zoltan.

EXTRA_MCFLAGS = -O-1 --lazy-code
mercury_compile.01     65.30
EXTRA_MCFLAGS = -O-1 --no-lazy-code
mercury_compile.02     56.34
EXTRA_MCFLAGS = -O0 --lazy-code
mercury_compile.03     52.00
EXTRA_MCFLAGS = -O0 --no-lazy-code
mercury_compile.04     51.44
EXTRA_MCFLAGS = -O1 --lazy-code
mercury_compile.05     51.77
EXTRA_MCFLAGS = -O1 --no-lazy-code
mercury_compile.06     51.36
EXTRA_MCFLAGS = -O2 --lazy-code
mercury_compile.07     43.71
EXTRA_MCFLAGS = -O2 --no-lazy-code
mercury_compile.08     42.56
EXTRA_MCFLAGS = -O3 --lazy-code
mercury_compile.09     42.95
EXTRA_MCFLAGS = -O3 --no-lazy-code
mercury_compile.10     42.31
EXTRA_MCFLAGS = -O4 --lazy-code
mercury_compile.11     41.76
EXTRA_MCFLAGS = -O4 --no-lazy-code
mercury_compile.12     42.03
EXTRA_MCFLAGS = -O5 --lazy-code
mercury_compile.13     41.34
EXTRA_MCFLAGS = -O5 --no-lazy-code
mercury_compile.14     42.05
EXTRA_MCFLAGS = --trace deep --lazy-code
mercury_compile.15     81.19
EXTRA_MCFLAGS = --trace deep --no-lazy-code
mercury_compile.16     80.07

Enable the eager code generator where appropriate.

compiler/options.m:
	Make eager code generation the default; switch back to laxy code
	generation at optimization levels 4 and higher.

compiler/handle_options.m:
	Regardless of optimization level, use eager code generation
	if debugging is enabled.

cvs diff: Diffing .
cvs diff: Diffing bindist
cvs diff: Diffing boehm_gc
cvs diff: Diffing boehm_gc/Mac_files
cvs diff: Diffing boehm_gc/cord
cvs diff: Diffing boehm_gc/cord/private
cvs diff: Diffing boehm_gc/include
cvs diff: Diffing boehm_gc/include/private
cvs diff: Diffing browser
cvs diff: Diffing bytecode
cvs diff: Diffing compiler
Index: compiler/handle_options.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/handle_options.m,v
retrieving revision 1.91
diff -u -r1.91 handle_options.m
--- compiler/handle_options.m	2000/09/27 05:22:03	1.91
+++ compiler/handle_options.m	2000/09/30 22:22:22
@@ -388,6 +388,9 @@
 			% we don't have to discover this fact anew
 			% for each procedure.
 		globals__io_set_option(optimize_value_number, bool(no)),
+			% Without value numbering, the eager code generator
+			% generates better code than the lazy code generator.
+		globals__io_set_option(lazy_code, bool(no)),
 			% The following options cause the info required
 			% by tracing to be generated.
 		globals__io_set_option(trace_stack_layout, bool(yes)),
Index: compiler/options.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/options.m,v
retrieving revision 1.291
diff -u -r1.291 options.m
--- compiler/options.m	2000/09/27 05:22:29	1.291
+++ compiler/options.m	2000/09/30 22:19:30
@@ -590,7 +590,7 @@
 	low_level_debug		-	bool(no),
 	trad_passes		-	bool(yes),
 	polymorphism		-	bool(yes),
-	lazy_code		-	bool(yes),
+	lazy_code		-	bool(no),
 	reclaim_heap_on_failure	-	bool_special,
 	reclaim_heap_on_semidet_failure	-	bool(yes),
 	reclaim_heap_on_nondet_failure	-	bool(yes),
@@ -1425,6 +1425,7 @@
 % and increases the inlining thresholds
 
 opt_level(4, _, [
+	lazy_code		-	bool(yes),
 	optimize_value_number	-	bool(yes),
 	inline_simple_threshold	-	int(8),
 	inline_compound_threshold -	int(20)
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