Command line:
gcc -O1 -fgraphite-identity
or
gcc -Os -fgraphite-identity
(doesn't happen at -O[023])
Tested revisions:
trunk r157460 - fail (after pr43349 fix)
trunk r153685 - fail
I am not sure if this is a regression - 4.4 compiles quickly, but time report
doesn't show any information about time spent in graphite code.
Compiler output:
$ /mnt/svn/gcc-trunk/binary-157460-lto/bin/gcc -ftime-report
-fgraphite-identity -O1 -c testcase.c
Execution times (seconds)
CFG verifier : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
tree gimplify : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
6 kB ( 0%) ggc
tree SSA rewrite : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
2 kB ( 0%) ggc
tree SSA incremental : 0.07 ( 1%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall
12 kB ( 0%) ggc
tree reassociation : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
5 kB ( 0%) ggc
Graphite loop transforms: 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
32 kB ( 1%) ggc
Graphite code generation: 10.52 (94%) usr 0.10 (91%) sys 11.02 (95%) wall
1222 kB (31%) ggc
tree SSA verifier : 0.14 ( 1%) usr 0.00 ( 0%) sys 0.11 ( 1%) wall
0 kB ( 0%) ggc
tree STMT verifier : 0.33 ( 3%) usr 0.00 ( 0%) sys 0.33 ( 3%) wall
0 kB ( 0%) ggc
dominance computation : 0.02 ( 0%) usr 0.01 ( 9%) sys 0.02 ( 0%) wall
0 kB ( 0%) ggc
expand : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
235 kB ( 6%) ggc
combiner : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
128 kB ( 3%) ggc
if-conversion : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
71 kB ( 2%) ggc
integrated RA : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
90 kB ( 2%) ggc
reload : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
44 kB ( 1%) ggc
final : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
plugin execution : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
TOTAL : 11.22 0.11 11.66
3925 kB
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.
(disabling checking doesn't significantly help)
--
Summary: Very long compile time with -O1 -fgraphite-identity
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: zsojka at seznam dot cz
GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43396
