https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110489
Bug ID: 110489
Summary: Slow building virtual.c.i from p11-kit
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: compile-time-hog
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 55430
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55430&action=edit
virtual.c.i.xz
I fear this is a degenerate case as it's a largeish generated file (made during
the build process), but it's noticeable enough for me to raise it anyway.
When building p11-kit, I noticed a handful of files took considerably longer to
build. This is with release checking.
The standout seems to be `virtual.c.i`:
```
$ time gcc -c virtual.c.i -O2 -fPIC
real 0m12.429s
user 0m12.137s
sys 0m0.238s
$ gcc --version
gcc (Gentoo 12.3.1_p20230526 p2) 12.3.1 20230526
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc -c virtual.c.i -O2 -pipe -fPIC -ftime-report
Time variable usr sys wall
GGC
phase setup : 0.00 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
1326k ( 0%)
phase parsing : 1.24 ( 5%) 1.01 ( 20%) 2.26 ( 7%)
53M ( 9%)
phase lang. deferred : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
96 ( 0%)
phase opt and generate : 24.16 ( 95%) 4.08 ( 80%) 28.74 ( 93%)
570M ( 91%)
phase finalize : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
garbage collection : 0.08 ( 0%) 0.00 ( 0%) 0.08 ( 0%)
0 ( 0%)
dump files : 1.07 ( 4%) 0.24 ( 5%) 1.58 ( 5%)
0 ( 0%)
callgraph construction : 0.14 ( 1%) 0.01 ( 0%) 0.22 ( 1%)
18M ( 3%)
callgraph optimization : 0.36 ( 1%) 0.12 ( 2%) 0.50 ( 2%)
13k ( 0%)
callgraph functions expansion : 20.14 ( 79%) 3.12 ( 61%) 23.71 ( 76%)
390M ( 62%)
callgraph ipa passes : 3.61 ( 14%) 0.84 ( 17%) 4.48 ( 14%)
132M ( 21%)
ipa function summary : 0.14 ( 1%) 0.04 ( 1%) 0.12 ( 0%)
13M ( 2%)
ipa dead code removal : 0.09 ( 0%) 0.00 ( 0%) 0.07 ( 0%)
0 ( 0%)
ipa devirtualization : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
ipa cp : 0.14 ( 1%) 0.04 ( 1%) 0.11 ( 0%)
6933k ( 1%)
ipa inlining heuristics : 0.14 ( 1%) 0.02 ( 0%) 0.10 ( 0%)
135k ( 0%)
ipa function splitting : 0.39 ( 2%) 0.06 ( 1%) 0.34 ( 1%)
40M ( 7%)
ipa comdats : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
ipa reference : 0.03 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
ipa profile : 0.02 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
ipa pure const : 0.07 ( 0%) 0.02 ( 0%) 0.16 ( 1%)
2416 ( 0%)
ipa icf : 0.14 ( 1%) 0.00 ( 0%) 0.14 ( 0%)
8112 ( 0%)
ipa SRA : 0.10 ( 0%) 0.00 ( 0%) 0.11 ( 0%)
1116k ( 0%)
ipa free lang data : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
ipa free inline summary : 0.02 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
0 ( 0%)
ipa modref : 0.08 ( 0%) 0.00 ( 0%) 0.08 ( 0%)
2874k ( 0%)
cfg construction : 0.02 ( 0%) 0.02 ( 0%) 0.06 ( 0%)
1323k ( 0%)
cfg cleanup : 0.23 ( 1%) 0.06 ( 1%) 0.34 ( 1%)
3108k ( 0%)
trivially dead code : 0.07 ( 0%) 0.02 ( 0%) 0.14 ( 0%)
0 ( 0%)
df scan insns : 0.20 ( 1%) 0.03 ( 1%) 0.25 ( 1%)
282k ( 0%)
df reaching defs : 0.21 ( 1%) 0.03 ( 1%) 0.37 ( 1%)
0 ( 0%)
df live regs : 0.35 ( 1%) 0.08 ( 2%) 0.31 ( 1%)
0 ( 0%)
df live&initialized regs : 0.23 ( 1%) 0.01 ( 0%) 0.17 ( 1%)
0 ( 0%)
df must-initialized regs : 0.06 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
df use-def / def-use chains : 0.10 ( 0%) 0.02 ( 0%) 0.17 ( 1%)
0 ( 0%)
df reg dead/unused notes : 0.40 ( 2%) 0.02 ( 0%) 0.32 ( 1%)
6334k ( 1%)
register information : 0.14 ( 1%) 0.01 ( 0%) 0.06 ( 0%)
0 ( 0%)
alias analysis : 0.46 ( 2%) 0.03 ( 1%) 0.31 ( 1%)
11M ( 2%)
alias stmt walking : 0.13 ( 1%) 0.04 ( 1%) 0.13 ( 0%)
18k ( 0%)
register scan : 0.02 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
137k ( 0%)
rebuild jump labels : 0.06 ( 0%) 0.00 ( 0%) 0.06 ( 0%)
0 ( 0%)
preprocessing : 0.32 ( 1%) 0.23 ( 5%) 0.60 ( 2%)
4145k ( 1%)
lexical analysis : 0.48 ( 2%) 0.37 ( 7%) 0.70 ( 2%)
0 ( 0%)
parser (global) : 0.10 ( 0%) 0.07 ( 1%) 0.25 ( 1%)
14M ( 2%)
parser struct body : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
181k ( 0%)
parser function body : 0.34 ( 1%) 0.34 ( 7%) 0.71 ( 2%)
34M ( 6%)
early inlining heuristics : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
50k ( 0%)
inline parameters : 0.16 ( 1%) 0.02 ( 0%) 0.16 ( 1%)
9064k ( 1%)
integration : 0.42 ( 2%) 0.02 ( 0%) 0.44 ( 1%)
17M ( 3%)
tree gimplify : 0.19 ( 1%) 0.05 ( 1%) 0.20 ( 1%)
20M ( 3%)
tree eh : 0.00 ( 0%) 0.01 ( 0%) 0.00 ( 0%)
0 ( 0%)
tree CFG construction : 0.00 ( 0%) 0.01 ( 0%) 0.05 ( 0%)
11M ( 2%)
tree CFG cleanup : 0.34 ( 1%) 0.10 ( 2%) 0.46 ( 1%)
68k ( 0%)
tree tail merge : 0.04 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
7696 ( 0%)
tree VRP : 0.39 ( 2%) 0.10 ( 2%) 0.58 ( 2%)
14M ( 2%)
tree Early VRP : 0.12 ( 0%) 0.05 ( 1%) 0.22 ( 1%)
6698k ( 1%)
tree copy propagation : 0.06 ( 0%) 0.00 ( 0%) 0.13 ( 0%)
432 ( 0%)
tree PTA : 0.80 ( 3%) 0.18 ( 4%) 1.10 ( 4%)
6475k ( 1%)
tree SSA other : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
tree SSA rewrite : 0.12 ( 0%) 0.02 ( 0%) 0.12 ( 0%)
10M ( 2%)
tree SSA incremental : 0.23 ( 1%) 0.04 ( 1%) 0.19 ( 1%)
3738k ( 1%)
tree operand scan : 0.07 ( 0%) 0.05 ( 1%) 0.16 ( 1%)
14M ( 2%)
dominator optimization : 0.62 ( 2%) 0.15 ( 3%) 0.53 ( 2%)
4427k ( 1%)
backwards jump threading : 0.27 ( 1%) 0.01 ( 0%) 0.31 ( 1%)
38k ( 0%)
tree SRA : 0.01 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
isolate eroneous paths : 0.01 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
tree CCP : 0.50 ( 2%) 0.08 ( 2%) 0.50 ( 2%)
696k ( 0%)
tree reassociation : 0.04 ( 0%) 0.02 ( 0%) 0.04 ( 0%)
48 ( 0%)
tree PRE : 0.34 ( 1%) 0.05 ( 1%) 0.35 ( 1%)
8448k ( 1%)
tree FRE : 0.46 ( 2%) 0.06 ( 1%) 0.55 ( 2%)
5354k ( 1%)
tree code sinking : 0.07 ( 0%) 0.02 ( 0%) 0.02 ( 0%)
270k ( 0%)
tree linearize phis : 0.02 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
6316k ( 1%)
tree backward propagate : 0.02 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
0 ( 0%)
tree forward propagate : 0.12 ( 0%) 0.05 ( 1%) 0.19 ( 1%)
41k ( 0%)
tree phiprop : 0.02 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
tree conservative DCE : 0.10 ( 0%) 0.02 ( 0%) 0.17 ( 1%)
7296 ( 0%)
tree aggressive DCE : 0.14 ( 1%) 0.04 ( 1%) 0.13 ( 0%)
12M ( 2%)
tree buildin call DCE : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
tree DSE : 0.03 ( 0%) 0.00 ( 0%) 0.09 ( 0%)
15k ( 0%)
PHI merge : 0.01 ( 0%) 0.01 ( 0%) 0.01 ( 0%)
48k ( 0%)
tree loop optimization : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
tree loop invariant motion : 0.02 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
complete unrolling : 0.01 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
12k ( 0%)
tree slp vectorization : 0.18 ( 1%) 0.04 ( 1%) 0.23 ( 1%)
12M ( 2%)
tree copy headers : 0.02 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
7904 ( 0%)
tree SSA uncprop : 0.05 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
0 ( 0%)
tree NRV optimization : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
139k ( 0%)
tree switch conversion : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
tree switch lowering : 0.00 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
0 ( 0%)
gimple CSE sin/cos : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
gimple widening/fma detection : 0.01 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
tree strlen optimization : 0.07 ( 0%) 0.01 ( 0%) 0.12 ( 0%)
6325k ( 1%)
tree modref : 0.14 ( 1%) 0.04 ( 1%) 0.16 ( 1%)
10M ( 2%)
dominance frontiers : 0.03 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
dominance computation : 0.50 ( 2%) 0.13 ( 3%) 0.82 ( 3%)
0 ( 0%)
control dependences : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
out of ssa : 0.06 ( 0%) 0.02 ( 0%) 0.11 ( 0%)
1061k ( 0%)
expand vars : 0.05 ( 0%) 0.01 ( 0%) 0.03 ( 0%)
2414k ( 0%)
expand : 0.54 ( 2%) 0.09 ( 2%) 0.55 ( 2%)
38M ( 6%)
post expand cleanups : 0.03 ( 0%) 0.02 ( 0%) 0.08 ( 0%)
3084k ( 0%)
lower subreg : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
jump : 0.04 ( 0%) 0.02 ( 0%) 0.03 ( 0%)
0 ( 0%)
forward prop : 0.42 ( 2%) 0.04 ( 1%) 0.50 ( 2%)
226k ( 0%)
CSE : 0.31 ( 1%) 0.03 ( 1%) 0.38 ( 1%)
237k ( 0%)
dead code elimination : 0.13 ( 1%) 0.02 ( 0%) 0.07 ( 0%)
0 ( 0%)
dead store elim1 : 0.12 ( 0%) 0.03 ( 1%) 0.22 ( 1%)
2042k ( 0%)
dead store elim2 : 0.16 ( 1%) 0.01 ( 0%) 0.18 ( 1%)
2333k ( 0%)
loop analysis : 0.04 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
0 ( 0%)
loop init : 0.36 ( 1%) 0.10 ( 2%) 0.44 ( 1%)
33M ( 5%)
loop fini : 0.09 ( 0%) 0.04 ( 1%) 0.13 ( 0%)
0 ( 0%)
CPROP : 0.43 ( 2%) 0.08 ( 2%) 0.50 ( 2%)
1842k ( 0%)
PRE : 0.13 ( 1%) 0.04 ( 1%) 0.17 ( 1%)
3816 ( 0%)
CSE 2 : 0.25 ( 1%) 0.04 ( 1%) 0.34 ( 1%)
311k ( 0%)
branch prediction : 0.11 ( 0%) 0.03 ( 1%) 0.07 ( 0%)
623k ( 0%)
combiner : 0.39 ( 2%) 0.04 ( 1%) 0.57 ( 2%)
4948k ( 1%)
if-conversion : 0.09 ( 0%) 0.01 ( 0%) 0.12 ( 0%)
86k ( 0%)
mode switching : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
integrated RA : 1.75 ( 7%) 0.11 ( 2%) 2.10 ( 7%)
147M ( 24%)
LRA non-specific : 0.39 ( 2%) 0.05 ( 1%) 0.50 ( 2%)
391k ( 0%)
LRA virtuals elimination : 0.02 ( 0%) 0.01 ( 0%) 0.06 ( 0%)
112k ( 0%)
LRA reload inheritance : 0.03 ( 0%) 0.00 ( 0%) 0.07 ( 0%)
0 ( 0%)
LRA create live ranges : 0.09 ( 0%) 0.02 ( 0%) 0.07 ( 0%)
8232 ( 0%)
LRA hard reg assignment : 0.01 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
reload : 0.02 ( 0%) 0.01 ( 0%) 0.05 ( 0%)
141k ( 0%)
reload CSE regs : 0.34 ( 1%) 0.11 ( 2%) 0.49 ( 2%)
3089k ( 0%)
ree : 0.05 ( 0%) 0.00 ( 0%) 0.09 ( 0%)
19k ( 0%)
thread pro- & epilogue : 0.32 ( 1%) 0.01 ( 0%) 0.32 ( 1%)
12M ( 2%)
if-conversion 2 : 0.07 ( 0%) 0.02 ( 0%) 0.04 ( 0%)
0 ( 0%)
combine stack adjustments : 0.01 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
0 ( 0%)
peephole 2 : 0.21 ( 1%) 0.02 ( 0%) 0.17 ( 1%)
1225k ( 0%)
hard reg cprop : 0.10 ( 0%) 0.01 ( 0%) 0.15 ( 0%)
552 ( 0%)
scheduling 2 : 1.55 ( 6%) 0.14 ( 3%) 1.35 ( 4%)
2653k ( 0%)
machine dep reorg : 0.11 ( 0%) 0.04 ( 1%) 0.12 ( 0%)
0 ( 0%)
reorder blocks : 0.10 ( 0%) 0.02 ( 0%) 0.21 ( 1%)
724k ( 0%)
shorten branches : 0.12 ( 0%) 0.02 ( 0%) 0.14 ( 0%)
0 ( 0%)
reg stack : 0.00 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
final : 0.33 ( 1%) 0.07 ( 1%) 0.59 ( 2%)
11M ( 2%)
variable output : 0.02 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
183k ( 0%)
tree if-combine : 0.03 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
80 ( 0%)
if to switch conversion : 0.02 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
straight-line strength reduction : 0.05 ( 0%) 0.00 ( 0%) 0.08 ( 0%)
864 ( 0%)
store merging : 0.01 ( 0%) 0.00 ( 0%) 0.06 ( 0%)
728 ( 0%)
initialize rtl : 0.02 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
12k ( 0%)
address lowering : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
360 ( 0%)
access analysis : 0.12 ( 0%) 0.03 ( 1%) 0.20 ( 1%)
16k ( 0%)
early local passes : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
unaccounted optimizations : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
rest of compilation : 1.76 ( 7%) 0.34 ( 7%) 1.82 ( 6%)
14M ( 2%)
unaccounted post reload : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
unaccounted late compilation : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
remove unused locals : 0.08 ( 0%) 0.04 ( 1%) 0.11 ( 0%)
0 ( 0%)
address taken : 0.07 ( 0%) 0.01 ( 0%) 0.15 ( 0%)
0 ( 0%)
rebuild frequencies : 0.04 ( 0%) 0.02 ( 0%) 0.10 ( 0%)
568 ( 0%)
repair loop structures : 0.03 ( 0%) 0.01 ( 0%) 0.02 ( 0%)
112 ( 0%)
TOTAL : 25.40 5.09 31.03
625M
```
