http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54827
Bug #: 54827
Summary: [4.8 Regression] 70% compile time regression building
builtin-sched.c from Linux's perf
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: mar...@trippelsdorf.de
With gcc-4.7.2 I get:
% time gcc -c -O3 -g builtin-sched.i
gcc -c -O3 -g builtin-sched.i 12.63s user 0.02s system 99% cpu 12.690 total
With current trunk:
% time gcc -c -O3 -g builtin-sched.i
gcc -c -O3 -g builtin-sched.i 40.54s user 0.03s system 99% cpu 40.703 total
perf report shows:
54.58% cc1 cc1 [.] find_base_term(rtx_def*)
8.02% cc1 cc1 [.]
ix86_find_base_term(rtx_def*)
3.55% cc1 cc1 [.]
rtx_equal_for_memref_p(rtx_def const*, rtx_def const*)
2.91% cc1 cc1 [.] true_dependence_1(rtx_def
const*, machine_mode, rtx_def*, rtx_def const*, rtx_def*, bool)
2.79% cc1 cc1 [.] memrefs_conflict_p(int,
rtx_def*, int, rtx_def*, long)
2.77% cc1 cc1 [.] exp_equiv_p(rtx_def
const*, rtx_def const*, int, bool)
2.01% cc1 cc1 [.] for_each_rtx_1(rtx_def*,
int, int (*)(rtx_def**, void*), void*)
1.76% cc1 cc1 [.] rtx_equal_p(rtx_def
const*, rtx_def const*)
-ftime-report:
Execution times (seconds)
phase setup : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
1101 kB ( 3%) ggc
phase parsing : 0.07 ( 0%) usr 0.07 (70%) sys 0.14 ( 0%) wall
13463 kB (32%) ggc
phase opt and generate : 39.64 (100%) usr 0.03 (30%) sys 39.79 (100%)
wall 26000 kB (62%) ggc
...
variable tracking : 1.58 ( 4%) usr 0.00 ( 0%) sys 1.57 ( 4%) wall
1210 kB ( 3%) ggc
var-tracking dataflow : 13.68 (34%) usr 0.00 ( 0%) sys 13.71 (34%) wall
107 kB ( 0%) ggc
var-tracking emit : 14.20 (36%) usr 0.00 ( 0%) sys 14.26 (36%) wall
435 kB ( 1%) ggc
...
TOTAL : 39.74 0.10 39.96
41799 kB
