https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396
--- Comment #5 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
> please do before you report compile time regressions.
Ok. Here are the new numbers from current trunk built with
--enable-checking=release
(nothing's changed that I can see; still very slow):
for j in 500 1000 2000 3000; do perl ./gen_bz18872.pl $j > t.c ; (time
gcc-svn-r227326-rel/bin/gcc -c -O2 t.c) |& grep user; done
user 0m1.488s
user 0m12.010s
user 1m40.353s
user 5m47.668s
Here is the -ftime-report:
perl ./gen_bz18872.pl 2000 > t.c && gcc-svn-r227326-rel/bin/gcc -c -O2 t.c
-ftime-report
Execution times (seconds)
phase setup : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
1066 kB (19%) ggc
phase parsing : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
1486 kB (27%) ggc
phase opt and generate : 100.30 (100%) usr 0.00 ( 0%) sys 100.43 (100%)
wall 2997 kB (54%) ggc
trivially dead code : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
df scan insns : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
0 kB ( 0%) ggc
preprocessing : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
948 kB (17%) ggc
lexical analysis : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
dead store elim1 : 100.17 (100%) usr 0.00 ( 0%) sys 100.29 (100%)
wall 171 kB ( 3%) ggc
dead store elim2 : 0.10 ( 0%) usr 0.00 ( 0%) sys 0.10 ( 0%) wall
171 kB ( 3%) ggc
scheduling 2 : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
1558 kB (28%) ggc
TOTAL : 100.32 0.00 100.45
5558 kB
perf report:
Samples: 406K of event 'cycles', Event count (approx.): 372444339282
32.97% cc1 cc1 [.] find_base_term(rtx_def*)
25.58% cc1 cc1 [.] get_addr(rtx_def*) [clone .part.33]
17.70% cc1 cc1 [.] rtx_equal_for_memref_p(rtx_def const*,
rtx_def const*)
11.33% cc1 cc1 [.] memrefs_conflict_p(int, rtx_def*, int,
rtx_def*, long) [clone .constprop.107]
5.79% cc1 cc1 [.] addr_side_effect_eval(rtx_def*, int, int)
[clone .constprop.108]
2.43% cc1 cc1 [.] cselib_sp_based_value_p(cselib_val*)
2.34% cc1 cc1 [.] ix86_find_base_term(rtx_def*)
1.41% cc1 cc1 [.] cselib_have_permanent_equivalences()
0.14% cc1 cc1 [.] record_store(rtx_def*, dse_bb_info_type*)
