OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

toplev.c (flag_if_conversion, [...]): New static variables. 

* toplev.c (flag_if_conversion, flag_if_conversion2): New static
	variables.
	(lang_independent_options): Add -fif-conversion, -fif-conversion2
	(rest_of_compilation): Do if conversion only when asked for.
	(parse_options_and_default_flags): Set new variables to 1 for -O1
	* invoke.texi (-fif-conversion, -fif-conversion2): Document.

From-SVN: r52891
This commit is contained in:
Jan Hubicka 2002-04-29 13:39:31 +02:00 committed by Jan Hubicka
parent 3de72741b9
commit 2c4b77f3ee
3 changed files with 43 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
Mon Apr 29 13:36:41 CEST 2002 Jan Hubicka <jh@suse.cz>
* toplev.c (flag_if_conversion, flag_if_conversion2): New static
variables.
(lang_independent_options): Add -fif-conversion, -fif-conversion2
(rest_of_compilation): Do if conversion only when asked for.
(parse_options_and_default_flags): Set new variables to 1 for -O1
* invoke.texi (-fif-conversion, -fif-conversion2): Document.
Mon Apr 29 13:02:50 CEST 2002 Jan Hubicka <jh@suse.cz>
* i386.c (dbx64_register_map): Fix typo.

13
gcc/doc/invoke.texi
View File

@ -267,6 +267,7 @@ in the following sections.
-fexpensive-optimizations -ffast-math -ffloat-store @gol
-fforce-addr -fforce-mem -ffunction-sections @gol
-fgcse -fgcse-lm -fgcse-sm -floop-optimize -fcrossjumping @gol
-fif-conversion -fif-conversion2 @gol
-finline-functions -finline-limit=@var{n} -fkeep-inline-functions @gol
-fkeep-static-consts -fmerge-constants -fmerge-all-constants @gol
-fmove-all-movables -fno-default-inline -fno-defer-pop @gol
@ -3522,6 +3523,18 @@ well.
Perform cross-jumping transformation. This transformation unifies equivalent code and save code size. The
resulting code may or may not perform better than without cross-jumping.
@item -fif-conversion
@opindex if-conversion
Attempt to transform conditional jumps into branch-less equivalents. This
include use of conditional moves, min, max, set flags and abs instructions, and
some tricks doable by standard arithmetics. The use of conditional execution
on chips where it is available is controlled by @code{if-conversion2}.
@item -fif-conversion2
@opindex if-conversion2
Use conditional execution (where available) to transform conditional jumps into
branch-less equivalents.
@item -fdelete-null-pointer-checks
@opindex fdelete-null-pointer-checks
Use global dataflow analysis to identify and eliminate useless checks

22
gcc/toplev.c
View File

@ -600,6 +600,14 @@ static int flag_loop_optimize;
static int flag_crossjumping;
/* Nonzero means perform if conversion. */
static int flag_if_conversion;
/* Nonzero means perform if conversion after reload. */
static int flag_if_conversion2;
/* Nonzero means to use global dataflow analysis to eliminate
useless null pointer tests. */
@ -1016,6 +1024,10 @@ static const lang_independent_options f_options[] =
N_("Perform the loop optimizations") },
{"crossjumping", &flag_crossjumping, 1,
N_("Perform cross-jumping optimization") },
{"if-conversion", &flag_if_conversion, 1,
N_("Perform conversion of conditional jumps to branchless equivalents") },
{"if-conversion2", &flag_if_conversion2, 1,
N_("Perform conversion of conditional jumps to conditional execution") },
{"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
N_("Run CSE pass after loop optimizations") },
{"rerun-loop-opt", &flag_rerun_loop_opt, 1,
@ -2635,7 +2647,7 @@ rest_of_compilation (decl)
timevar_push (TV_JUMP);
if (optimize > 0)
if (flag_delete_null_pointer_checks || flag_if_conversion)
{
open_dump_file (DFI_null, decl);
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
@ -2648,6 +2660,7 @@ rest_of_compilation (decl)
delete_null_pointer_checks (insns);
timevar_push (TV_IFCVT);
if (flag_if_conversion)
if_convert (0);
timevar_pop (TV_IFCVT);
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
@ -2897,6 +2910,7 @@ rest_of_compilation (decl)
timevar_push (TV_IFCVT);
cleanup_cfg (CLEANUP_EXPENSIVE);
if (flag_if_conversion)
if_convert (0);
timevar_pop(TV_IFCVT);
@ -2996,7 +3010,7 @@ rest_of_compilation (decl)
/* Rerun if-conversion, as combine may have simplified things enough to
now meet sequence length restrictions. */
if (optimize > 0)
if (flag_if_conversion)
{
timevar_push (TV_IFCVT);
open_dump_file (DFI_ce, decl);
@ -3237,7 +3251,7 @@ rest_of_compilation (decl)
timevar_pop (TV_RENAME_REGISTERS);
}
if (optimize > 0)
if (flag_if_conversion2)
{
timevar_push (TV_IFCVT2);
open_dump_file (DFI_ce2, decl);
@ -4593,6 +4607,8 @@ parse_options_and_default_flags (argc, argv)
flag_cprop_registers = 1;
flag_loop_optimize = 1;
flag_crossjumping = 1;
flag_if_conversion = 1;
flag_if_conversion2 = 1;
}
if (optimize >= 2)