https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90001
Bug ID: 90001
Summary: Compile-time hog in swing modulo scheduler
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: compile-time-hog
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-*-linux-gnu
At least gcc-9.0.0-alpha20190407 (r270192), 8.2, 7.3, 6.3 take inordinate time
when compiling the following testcase reduced from
libgomp/testsuite/libgomp.oacc-c-c++-common/parallel-loop-1.c w/ -O1
-fmodulo-sched -funroll-all-loops:
% time powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20190407 -O1 -fmodulo-sched
-funroll-all-loops -c parallel-loop-1.c -ftime-report
Time variable usr sys wall
GGC
phase setup : 0.00 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
1582 kB ( 33%)
phase opt and generate : 17.22 (100%) 0.00 ( 0%) 17.23 (100%)
3076 kB ( 64%)
trivially dead code : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 kB ( 0%)
tree SSA incremental : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
60 kB ( 1%)
dominator optimization : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
25 kB ( 1%)
complete unrolling : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
175 kB ( 4%)
tree STMT verifier : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 kB ( 0%)
CSE : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
17 kB ( 0%)
dead store elim1 : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
79 kB ( 2%)
web : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 kB ( 0%)
sms modulo scheduling : 17.17 (100%) 0.00 ( 0%) 17.17 (100%)
50 kB ( 1%)
integrated RA : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
815 kB ( 17%)
rename registers : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
6 kB ( 0%)
verify RTL sharing : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 kB ( 0%)
TOTAL : 17.22 0.00 17.23
4844 kB
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.
powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20190407 -O1 -fmodulo-sched -c
17.23s user 0.01s system 99% cpu 17.237 total
99.95% cc1 [.] longest_simple_path
0.03% cc1 [.] create_ddg_all_sccs
0.03% cc1 [.] memcpy@plt
