https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84040
Bug ID: 84040
Summary: [8 regression] compilation time of
gcc.c-torture/compile/limits-blockid.c is 50x slower
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: nsz at gcc dot gnu.org
Target Milestone: ---
noticed on aarch64 recently that
gcc -c -O3 -g gcc/gcc/testsuite/gcc.c-torture/compile/limits-blockid.c
is much slower with gcc-8 (about 2min here) than with gcc-7 (about 2s).
times with -ftime-report -ftime-report-details : usr/sys/wall/mem
gcc-8 -g
phase opt and generate: 0.59 (28%) usr 0.04 ( 6%) sys 0.62 (22%) wall
78453 kB (61%) ggc
TOTAL : 2.11 0.71 2.83
129464 kB
gcc-8 -O3
phase opt and generate: 0.14 (12%) usr 0.01 ( 1%) sys 0.15 ( 8%) wall
2121 kB ( 4%) ggc
TOTAL : 1.18 0.67 1.86
50773 kB
gcc-8 -O3 -g
phase opt and generate : 105.10 (99%) usr 0.22 (23%) sys 105.33 (98%) wall
110874 kB (67%) ggc
...
scheduling : 34.45 (32%) usr 0.03 ( 3%) sys 34.49 (32%) wall
3906 kB ( 2%) ggc
scheduling fusion : 34.72 (33%) usr 0.02 ( 2%) sys 34.75 (32%) wall
3908 kB ( 2%) ggc
scheduling 2 : 34.39 (32%) usr 0.01 ( 1%) sys 34.39 (32%) wall
3906 kB ( 2%) ggc
...
TOTAL : 106.59 0.97 107.57
166572 kB
gcc-7 -O3 -g
phase opt and generate: 0.61 (31%) usr 0.02 ( 3%) sys 0.63 (23%) wall
42520 kB (46%) ggc
TOTAL : 2.00 0.76 2.78
93398 kB
