http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46590
--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> 2010-11-21
19:39:23 UTC ---
With -fno-ivopts, the alias statement walking is the clear culprit
(a somewhat shorter test case):
i...@linux-fd1f:~/Krempel/Dep-c> time
~/libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/f951 -ftime-report -O2 -fno-ivopts
gener-4.f90
MAIN__ main
Analyzing compilation unit
{GC 44026k -> 25146k}Performing interprocedural optimizations
<*free_lang_data> <visibility> <early_local_cleanups> {GC 37683k -> 36011k}
<whole-program> <ipa-profile> <cp> <inline> <pure-const> <static-var>Assembling
functions:
MAIN__ {GC 54739k -> 37948k} {GC 61997k -> 51931k} {GC 77889k -> 51575k} {GC
103199k -> 77477k} {GC 100723k -> 74180k} {GC 98147k -> 73521k} main
Execution times (seconds)
garbage collection : 0.79 ( 0%) usr 0.00 ( 0%) sys 0.81 ( 0%) wall
0 kB ( 0%) ggc
callgraph construction: 0.06 ( 0%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall
2465 kB ( 1%) ggc
callgraph optimization: 0.02 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
2 kB ( 0%) ggc
ipa cp : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
256 kB ( 0%) ggc
ipa profile : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
ipa pure const : 0.04 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall
0 kB ( 0%) ggc
cfg construction : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
cfg cleanup : 0.19 ( 0%) usr 0.00 ( 0%) sys 0.16 ( 0%) wall
344 kB ( 0%) ggc
CFG verifier : 1.40 ( 0%) usr 0.01 ( 0%) sys 1.35 ( 0%) wall
0 kB ( 0%) ggc
trivially dead code : 0.20 ( 0%) usr 0.00 ( 0%) sys 0.20 ( 0%) wall
0 kB ( 0%) ggc
df scan insns : 0.20 ( 0%) usr 0.01 ( 0%) sys 0.21 ( 0%) wall
0 kB ( 0%) ggc
df multiple defs : 0.07 ( 0%) usr 0.00 ( 0%) sys 0.07 ( 0%) wall
0 kB ( 0%) ggc
df reaching defs : 2.12 ( 1%) usr 0.01 ( 0%) sys 2.15 ( 1%) wall
0 kB ( 0%) ggc
df live regs : 0.93 ( 0%) usr 0.00 ( 0%) sys 1.00 ( 0%) wall
0 kB ( 0%) ggc
df live&initialized regs: 0.26 ( 0%) usr 0.00 ( 0%) sys 0.23 ( 0%) wall
0 kB ( 0%) ggc
df use-def / def-use chains: 0.11 ( 0%) usr 0.00 ( 0%) sys 0.11 ( 0%)
wall 0 kB ( 0%) ggc
df reg dead/unused notes: 0.44 ( 0%) usr 0.00 ( 0%) sys 0.45 ( 0%) wall
2460 kB ( 1%) ggc
register information : 0.11 ( 0%) usr 0.00 ( 0%) sys 0.10 ( 0%) wall
0 kB ( 0%) ggc
alias analysis : 0.30 ( 0%) usr 0.00 ( 0%) sys 0.31 ( 0%) wall
2816 kB ( 1%) ggc
alias stmt walking : 205.44 (72%) usr 1.33 (58%) sys 207.39 (72%) wall
7023 kB ( 3%) ggc
register scan : 0.06 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall
0 kB ( 0%) ggc
rebuild jump labels : 0.12 ( 0%) usr 0.00 ( 0%) sys 0.13 ( 0%) wall
0 kB ( 0%) ggc
parser : 0.44 ( 0%) usr 0.03 ( 1%) sys 0.47 ( 0%) wall
20481 kB ( 8%) ggc
inline heuristics : 0.09 ( 0%) usr 0.00 ( 0%) sys 0.09 ( 0%) wall
0 kB ( 0%) ggc
tree gimplify : 0.16 ( 0%) usr 0.01 ( 0%) sys 0.18 ( 0%) wall
17257 kB ( 6%) ggc
tree eh : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
tree CFG construction : 0.05 ( 0%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall
5915 kB ( 2%) ggc
tree CFG cleanup : 1.08 ( 0%) usr 0.02 ( 1%) sys 1.15 ( 0%) wall
602 kB ( 0%) ggc
tree VRP : 0.44 ( 0%) usr 0.00 ( 0%) sys 0.45 ( 0%) wall
4778 kB ( 2%) ggc
tree copy propagation : 0.23 ( 0%) usr 0.01 ( 0%) sys 0.25 ( 0%) wall
75 kB ( 0%) ggc
tree find ref. vars : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
865 kB ( 0%) ggc
tree PTA : 2.31 ( 1%) usr 0.06 ( 3%) sys 2.38 ( 1%) wall
2253 kB ( 1%) ggc
tree PHI insertion : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
2203 kB ( 1%) ggc
tree SSA rewrite : 3.08 ( 1%) usr 0.01 ( 0%) sys 5.10 ( 2%) wall
6503 kB ( 2%) ggc
tree SSA other : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall
32 kB ( 0%) ggc
tree SSA incremental : 6.20 ( 2%) usr 0.03 ( 1%) sys 7.43 ( 3%) wall
1372 kB ( 1%) ggc
tree operand scan : 0.13 ( 0%) usr 0.10 ( 4%) sys 0.19 ( 0%) wall
13430 kB ( 5%) ggc
dominator optimization: 0.40 ( 0%) usr 0.01 ( 0%) sys 0.41 ( 0%) wall
22013 kB ( 8%) ggc
tree SRA : 0.12 ( 0%) usr 0.02 ( 1%) sys 0.14 ( 0%) wall
11123 kB ( 4%) ggc
tree CCP : 0.47 ( 0%) usr 0.02 ( 1%) sys 0.52 ( 0%) wall
838 kB ( 0%) ggc
tree PHI const/copy prop: 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
0 kB ( 0%) ggc
tree reassociation : 0.05 ( 0%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall
559 kB ( 0%) ggc
tree PRE : 0.65 ( 0%) usr 0.05 ( 2%) sys 0.70 ( 0%) wall
7992 kB ( 3%) ggc
tree FRE : 0.43 ( 0%) usr 0.05 ( 2%) sys 0.38 ( 0%) wall
530 kB ( 0%) ggc
tree code sinking : 0.04 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall
360 kB ( 0%) ggc
tree linearize phis : 0.04 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
0 kB ( 0%) ggc
tree forward propagate: 0.04 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall
337 kB ( 0%) ggc
tree phiprop : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
0 kB ( 0%) ggc
tree conservative DCE : 0.10 ( 0%) usr 0.04 ( 2%) sys 0.11 ( 0%) wall
64 kB ( 0%) ggc
tree aggressive DCE : 0.25 ( 0%) usr 0.01 ( 0%) sys 0.29 ( 0%) wall
4194 kB ( 2%) ggc
tree DSE : 0.90 ( 0%) usr 0.01 ( 0%) sys 0.91 ( 0%) wall
0 kB ( 0%) ggc
tree loop bounds : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
821 kB ( 0%) ggc
tree loop invariant motion: 0.05 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%)
wall 0 kB ( 0%) ggc
tree canonical iv : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
1012 kB ( 0%) ggc
complete unrolling : 1.38 ( 0%) usr 0.05 ( 2%) sys 1.84 ( 1%) wall
16838 kB ( 6%) ggc
tree loop init : 0.04 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall
394 kB ( 0%) ggc
tree loop fini : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
tree copy headers : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
613 kB ( 0%) ggc
tree SSA uncprop : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
tree rename SSA copies: 0.06 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall
0 kB ( 0%) ggc
tree SSA verifier : 2.85 ( 1%) usr 0.01 ( 0%) sys 2.99 ( 1%) wall
0 kB ( 0%) ggc
tree STMT verifier : 5.48 ( 2%) usr 0.00 ( 0%) sys 5.55 ( 2%) wall
0 kB ( 0%) ggc
tree switch initialization conversion: 0.00 ( 0%) usr 0.00 ( 0%) sys
0.01 ( 0%) wall 0 kB ( 0%) ggc
callgraph verifier : 0.18 ( 0%) usr 0.00 ( 0%) sys 0.16 ( 0%) wall
0 kB ( 0%) ggc
dominance frontiers : 6.84 ( 2%) usr 0.01 ( 0%) sys 4.58 ( 2%) wall
0 kB ( 0%) ggc
dominance computation : 4.91 ( 2%) usr 0.00 ( 0%) sys 3.66 ( 1%) wall
0 kB ( 0%) ggc
control dependences : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
out of ssa : 0.12 ( 0%) usr 0.00 ( 0%) sys 0.11 ( 0%) wall
0 kB ( 0%) ggc
expand vars : 0.10 ( 0%) usr 0.00 ( 0%) sys 0.11 ( 0%) wall
1109 kB ( 0%) ggc
expand : 0.54 ( 0%) usr 0.02 ( 1%) sys 0.56 ( 0%) wall
38882 kB (14%) ggc
post expand cleanups : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
1 kB ( 0%) ggc
forward prop : 0.22 ( 0%) usr 0.01 ( 0%) sys 0.21 ( 0%) wall
1581 kB ( 1%) ggc
CSE : 1.07 ( 0%) usr 0.00 ( 0%) sys 1.06 ( 0%) wall
1762 kB ( 1%) ggc
dead code elimination : 0.14 ( 0%) usr 0.00 ( 0%) sys 0.14 ( 0%) wall
0 kB ( 0%) ggc
dead store elim1 : 0.23 ( 0%) usr 0.00 ( 0%) sys 0.25 ( 0%) wall
4983 kB ( 2%) ggc
dead store elim2 : 0.52 ( 0%) usr 0.00 ( 0%) sys 0.52 ( 0%) wall
6295 kB ( 2%) ggc
loop analysis : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.03 ( 0%) wall
836 kB ( 0%) ggc
loop invariant motion : 5.52 ( 2%) usr 0.00 ( 0%) sys 5.50 ( 2%) wall
0 kB ( 0%) ggc
CPROP : 0.89 ( 0%) usr 0.04 ( 2%) sys 0.94 ( 0%) wall
8097 kB ( 3%) ggc
PRE : 10.12 ( 4%) usr 0.11 ( 5%) sys 10.28 ( 4%) wall
2091 kB ( 1%) ggc
CSE 2 : 0.55 ( 0%) usr 0.00 ( 0%) sys 0.55 ( 0%) wall
547 kB ( 0%) ggc
branch prediction : 0.13 ( 0%) usr 0.00 ( 0%) sys 0.13 ( 0%) wall
1542 kB ( 1%) ggc
combiner : 0.36 ( 0%) usr 0.00 ( 0%) sys 0.36 ( 0%) wall
4406 kB ( 2%) ggc
if-conversion : 0.03 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
559 kB ( 0%) ggc
regmove : 0.05 ( 0%) usr 0.00 ( 0%) sys 0.07 ( 0%) wall
0 kB ( 0%) ggc
integrated RA : 2.07 ( 1%) usr 0.18 ( 8%) sys 2.26 ( 1%) wall
5525 kB ( 2%) ggc
reload : 0.93 ( 0%) usr 0.00 ( 0%) sys 0.93 ( 0%) wall
14653 kB ( 5%) ggc
reload CSE regs : 1.30 ( 0%) usr 0.00 ( 0%) sys 1.32 ( 0%) wall
13495 kB ( 5%) ggc
zee : 0.05 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall
0 kB ( 0%) ggc
thread pro- & epilogue: 0.06 ( 0%) usr 0.00 ( 0%) sys 0.07 ( 0%) wall
3 kB ( 0%) ggc
if-conversion 2 : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
279 kB ( 0%) ggc
combine stack adjustments: 0.02 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
peephole 2 : 0.08 ( 0%) usr 0.00 ( 0%) sys 0.07 ( 0%) wall
354 kB ( 0%) ggc
hard reg cprop : 0.35 ( 0%) usr 0.00 ( 0%) sys 0.34 ( 0%) wall
0 kB ( 0%) ggc
scheduling 2 : 1.83 ( 1%) usr 0.02 ( 1%) sys 1.94 ( 1%) wall
71 kB ( 0%) ggc
machine dep reorg : 0.16 ( 0%) usr 0.00 ( 0%) sys 0.17 ( 0%) wall
0 kB ( 0%) ggc
reorder blocks : 0.10 ( 0%) usr 0.00 ( 0%) sys 0.09 ( 0%) wall
891 kB ( 0%) ggc
final : 0.32 ( 0%) usr 0.01 ( 0%) sys 0.33 ( 0%) wall
0 kB ( 0%) ggc
tree if-combine : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
rest of compilation : 0.43 ( 0%) usr 0.00 ( 0%) sys 0.39 ( 0%) wall
3151 kB ( 1%) ggc
remove unused locals : 0.40 ( 0%) usr 0.00 ( 0%) sys 0.45 ( 0%) wall
0 kB ( 0%) ggc
address taken : 0.10 ( 0%) usr 0.00 ( 0%) sys 0.10 ( 0%) wall
32 kB ( 0%) ggc
unaccounted todo : 0.13 ( 0%) usr 0.01 ( 0%) sys 0.07 ( 0%) wall
0 kB ( 0%) ggc
verify loop closed : 0.25 ( 0%) usr 0.00 ( 0%) sys 0.22 ( 0%) wall
0 kB ( 0%) ggc
verify RTL sharing : 1.59 ( 1%) usr 0.00 ( 0%) sys 1.61 ( 1%) wall
0 kB ( 0%) ggc
repair loop structures: 0.05 ( 0%) usr 0.00 ( 0%) sys 0.05 ( 0%) wall
145 kB ( 0%) ggc
TOTAL : 283.50 2.31 286.74
270936 kB
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.
real 4m46.813s
user 4m43.509s
sys 0m2.336s
