https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113900
--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
This actually takes ages even when it doesn't ICE:
```
$ gcc -c ./slarith.i -O2 -ftime-report
Time variable usr sys wall
GGC
phase setup : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
1841k ( 0%)
phase parsing : 0.47 ( 1%) 0.41 ( 37%) 0.88 ( 2%)
24M ( 4%)
phase opt and generate : 33.91 ( 99%) 0.70 ( 63%) 34.61 ( 97%)
633M ( 96%)
garbage collection : 0.53 ( 2%) 0.01 ( 1%) 0.54 ( 2%)
0 ( 0%)
dump files : 0.06 ( 0%) 0.00 ( 0%) 0.06 ( 0%)
0 ( 0%)
callgraph construction : 0.02 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
8742k ( 1%)
callgraph optimization : 0.05 ( 0%) 0.00 ( 0%) 0.06 ( 0%)
2200 ( 0%)
callgraph functions expansion : 28.02 ( 82%) 0.45 ( 41%) 28.47 ( 80%)
500M ( 76%)
callgraph ipa passes : 5.47 ( 16%) 0.21 ( 19%) 5.68 ( 16%)
70M ( 11%)
ipa function summary : 0.34 ( 1%) 0.00 ( 0%) 0.37 ( 1%)
14M ( 2%)
ipa devirtualization : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
ipa cp : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
151k ( 0%)
ipa inlining heuristics : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
48k ( 0%)
ipa function splitting : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
9192 ( 0%)
ipa reference : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
ipa profile : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
ipa pure const : 0.03 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
3792 ( 0%)
ipa icf : 0.03 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
48k ( 0%)
ipa SRA : 0.02 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
37k ( 0%)
ipa free inline summary : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
ipa modref : 0.04 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
459k ( 0%)
cfg construction : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
2113k ( 0%)
cfg cleanup : 0.19 ( 1%) 0.00 ( 0%) 0.21 ( 1%)
4518k ( 1%)
CFG verifier : 0.90 ( 3%) 0.04 ( 4%) 0.82 ( 2%)
0 ( 0%)
trivially dead code : 0.02 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
df scan insns : 0.05 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
12k ( 0%)
df reaching defs : 0.19 ( 1%) 0.00 ( 0%) 0.20 ( 1%)
0 ( 0%)
df live regs : 0.40 ( 1%) 0.01 ( 1%) 0.39 ( 1%)
0 ( 0%)
df live&initialized regs : 0.17 ( 0%) 0.00 ( 0%) 0.19 ( 1%)
0 ( 0%)
df must-initialized regs : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
df use-def / def-use chains : 0.08 ( 0%) 0.00 ( 0%) 0.10 ( 0%)
0 ( 0%)
df reg dead/unused notes : 0.17 ( 0%) 0.01 ( 1%) 0.15 ( 0%)
3314k ( 0%)
register information : 0.04 ( 0%) 0.01 ( 1%) 0.01 ( 0%)
0 ( 0%)
alias analysis : 0.08 ( 0%) 0.00 ( 0%) 0.12 ( 0%)
14M ( 2%)
alias stmt walking : 0.15 ( 0%) 0.02 ( 2%) 0.24 ( 1%)
227k ( 0%)
register scan : 0.03 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
154k ( 0%)
rebuild jump labels : 0.02 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
768 ( 0%)
preprocessing : 0.10 ( 0%) 0.11 ( 10%) 0.19 ( 1%)
500k ( 0%)
lexical analysis : 0.12 ( 0%) 0.14 ( 13%) 0.36 ( 1%)
0 ( 0%)
parser (global) : 0.02 ( 0%) 0.01 ( 1%) 0.03 ( 0%)
3270k ( 0%)
parser function body : 0.19 ( 1%) 0.14 ( 13%) 0.28 ( 1%)
20M ( 3%)
early inlining heuristics : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
23k ( 0%)
inline parameters : 0.11 ( 0%) 0.00 ( 0%) 0.12 ( 0%)
801k ( 0%)
tree gimplify : 0.12 ( 0%) 0.01 ( 1%) 0.12 ( 0%)
30M ( 5%)
tree CFG construction : 0.06 ( 0%) 0.01 ( 1%) 0.06 ( 0%)
22M ( 3%)
tree CFG cleanup : 0.36 ( 1%) 0.00 ( 0%) 0.24 ( 1%)
320k ( 0%)
tree tail merge : 0.02 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
3392k ( 1%)
tree VRP : 1.51 ( 4%) 0.01 ( 1%) 1.60 ( 5%)
20M ( 3%)
tree Early VRP : 0.78 ( 2%) 0.02 ( 2%) 0.84 ( 2%)
11M ( 2%)
tree copy propagation : 0.10 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
353k ( 0%)
tree PTA : 0.22 ( 1%) 0.00 ( 0%) 0.18 ( 1%)
2501k ( 0%)
tree SSA other : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
tree SSA rewrite : 0.03 ( 0%) 0.01 ( 1%) 0.09 ( 0%)
5749k ( 1%)
tree SSA incremental : 0.10 ( 0%) 0.01 ( 1%) 0.09 ( 0%)
4424k ( 1%)
tree operand scan : 0.08 ( 0%) 0.05 ( 5%) 0.09 ( 0%)
9419k ( 1%)
dominator optimization : 0.99 ( 3%) 0.00 ( 0%) 1.05 ( 3%)
7120k ( 1%)
backwards jump threading : 0.59 ( 2%) 0.00 ( 0%) 0.51 ( 1%)
1062k ( 0%)
tree SRA : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
tree CCP : 1.81 ( 5%) 0.00 ( 0%) 1.88 ( 5%)
2790k ( 0%)
tree split crit edges : 0.04 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
3148k ( 0%)
tree reassociation : 0.05 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
11k ( 0%)
tree PRE : 0.58 ( 2%) 0.01 ( 1%) 0.54 ( 2%)
9776k ( 1%)
tree FRE : 0.71 ( 2%) 0.08 ( 7%) 0.74 ( 2%)
2240k ( 0%)
tree RPO VN : 0.03 ( 0%) 0.01 ( 1%) 0.00 ( 0%)
973k ( 0%)
tree code sinking : 0.03 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
5259k ( 1%)
tree linearize phis : 0.07 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
1195k ( 0%)
tree backward propagate : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
tree forward propagate : 0.15 ( 0%) 0.02 ( 2%) 0.13 ( 0%)
1359k ( 0%)
tree phiprop : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
tree conservative DCE : 0.04 ( 0%) 0.03 ( 3%) 0.03 ( 0%)
104k ( 0%)
tree aggressive DCE : 0.18 ( 1%) 0.00 ( 0%) 0.26 ( 1%)
14M ( 2%)
tree DSE : 0.10 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
900k ( 0%)
PHI merge : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
1360k ( 0%)
tree loop optimization : 0.00 ( 0%) 0.01 ( 1%) 0.00 ( 0%)
0 ( 0%)
tree loop invariant motion : 0.06 ( 0%) 0.00 ( 0%) 0.08 ( 0%)
0 ( 0%)
tree canonical iv : 0.16 ( 0%) 0.00 ( 0%) 0.09 ( 0%)
5872k ( 1%)
scev constant prop : 0.07 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
2690k ( 0%)
complete unrolling : 0.56 ( 2%) 0.00 ( 0%) 0.52 ( 1%)
27M ( 4%)
tree vectorization : 0.96 ( 3%) 0.00 ( 0%) 0.92 ( 3%)
99M ( 15%)
tree slp vectorization : 0.35 ( 1%) 0.00 ( 0%) 0.32 ( 1%)
53M ( 8%)
tree loop distribution : 0.10 ( 0%) 0.00 ( 0%) 0.19 ( 1%)
5678k ( 1%)
tree iv optimization : 0.68 ( 2%) 0.02 ( 2%) 0.73 ( 2%)
25M ( 4%)
predictive commoning : 0.17 ( 0%) 0.00 ( 0%) 0.23 ( 1%)
9610k ( 1%)
tree copy headers : 0.36 ( 1%) 0.00 ( 0%) 0.37 ( 1%)
14M ( 2%)
tree SSA uncprop : 0.00 ( 0%) 0.01 ( 1%) 0.00 ( 0%)
0 ( 0%)
tree NRV optimization : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
4032 ( 0%)
tree SSA verifier : 2.42 ( 7%) 0.07 ( 6%) 2.31 ( 7%)
0 ( 0%)
tree STMT verifier : 2.45 ( 7%) 0.06 ( 5%) 2.61 ( 7%)
0 ( 0%)
gimple widening/fma detection : 0.01 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
256 ( 0%)
tree strlen optimization : 0.06 ( 0%) 0.00 ( 0%) 0.11 ( 0%)
3430k ( 1%)
tree modref : 0.06 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
497k ( 0%)
callgraph verifier : 0.09 ( 0%) 0.02 ( 2%) 0.08 ( 0%)
0 ( 0%)
dominance frontiers : 0.00 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
0 ( 0%)
dominance computation : 0.28 ( 1%) 0.03 ( 3%) 0.42 ( 1%)
0 ( 0%)
control dependences : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
out of ssa : 0.03 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
283k ( 0%)
expand vars : 0.02 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
6005k ( 1%)
expand : 0.11 ( 0%) 0.00 ( 0%) 0.12 ( 0%)
21M ( 3%)
post expand cleanups : 0.02 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
3074k ( 0%)
lower subreg : 0.02 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
0 ( 0%)
forward prop : 0.19 ( 1%) 0.00 ( 0%) 0.15 ( 0%)
740k ( 0%)
CSE : 0.32 ( 1%) 0.00 ( 0%) 0.25 ( 1%)
955k ( 0%)
dead code elimination : 0.11 ( 0%) 0.00 ( 0%) 0.12 ( 0%)
12k ( 0%)
dead store elim1 : 0.09 ( 0%) 0.00 ( 0%) 0.12 ( 0%)
3782k ( 1%)
dead store elim2 : 0.04 ( 0%) 0.00 ( 0%) 0.10 ( 0%)
3907k ( 1%)
loop analysis : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
loop init : 0.56 ( 2%) 0.00 ( 0%) 0.43 ( 1%)
41M ( 6%)
loop invariant motion : 2.79 ( 8%) 0.01 ( 1%) 2.83 ( 8%)
203k ( 0%)
loop unrolling : 2.96 ( 9%) 0.03 ( 3%) 3.01 ( 8%)
6601k ( 1%)
loop fini : 0.03 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
4096 ( 0%)
CPROP : 0.36 ( 1%) 0.00 ( 0%) 0.48 ( 1%)
6688k ( 1%)
PRE : 0.30 ( 1%) 0.00 ( 0%) 0.24 ( 1%)
33k ( 0%)
CSE 2 : 0.21 ( 1%) 0.01 ( 1%) 0.17 ( 0%)
460k ( 0%)
branch prediction : 0.23 ( 1%) 0.00 ( 0%) 0.22 ( 1%)
12M ( 2%)
combiner : 0.51 ( 1%) 0.00 ( 0%) 0.47 ( 1%)
17M ( 3%)
if-conversion : 0.16 ( 0%) 0.00 ( 0%) 0.17 ( 0%)
230k ( 0%)
mode switching : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
integrated RA : 0.53 ( 2%) 0.01 ( 1%) 0.48 ( 1%)
25M ( 4%)
LRA non-specific : 0.17 ( 0%) 0.00 ( 0%) 0.15 ( 0%)
711k ( 0%)
LRA virtuals elimination : 0.02 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
107k ( 0%)
LRA reload inheritance : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
36k ( 0%)
LRA create live ranges : 0.06 ( 0%) 0.00 ( 0%) 0.08 ( 0%)
18k ( 0%)
LRA hard reg assignment : 0.01 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
LRA rematerialization : 0.02 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
reload : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
6240 ( 0%)
reload CSE regs : 0.19 ( 1%) 0.00 ( 0%) 0.25 ( 1%)
5298k ( 1%)
ree : 0.09 ( 0%) 0.00 ( 0%) 0.06 ( 0%)
67k ( 0%)
thread pro- & epilogue : 0.09 ( 0%) 0.01 ( 1%) 0.05 ( 0%)
469k ( 0%)
if-conversion 2 : 0.05 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
19k ( 0%)
combine stack adjustments : 0.02 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
6240 ( 0%)
peephole 2 : 0.09 ( 0%) 0.00 ( 0%) 0.09 ( 0%)
667k ( 0%)
hard reg cprop : 0.10 ( 0%) 0.00 ( 0%) 0.07 ( 0%)
33k ( 0%)
scheduling 2 : 0.33 ( 1%) 0.00 ( 0%) 0.39 ( 1%)
996k ( 0%)
machine dep reorg : 0.09 ( 0%) 0.01 ( 1%) 0.12 ( 0%)
12k ( 0%)
reorder blocks : 0.08 ( 0%) 0.00 ( 0%) 0.07 ( 0%)
2289k ( 0%)
shorten branches : 0.03 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
reg stack : 0.02 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
75k ( 0%)
final : 0.05 ( 0%) 0.01 ( 1%) 0.11 ( 0%)
5355k ( 1%)
tree if-combine : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
252k ( 0%)
if to switch conversion : 0.00 ( 0%) 0.00 ( 0%) 0.02 ( 0%)
1144 ( 0%)
straight-line strength reduction : 0.04 ( 0%) 0.01 ( 1%) 0.04 ( 0%)
233k ( 0%)
store merging : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
480 ( 0%)
tree loop if-conversion : 0.11 ( 0%) 0.00 ( 0%) 0.12 ( 0%)
5909k ( 1%)
access analysis : 0.18 ( 1%) 0.00 ( 0%) 0.16 ( 0%)
4496 ( 0%)
early local passes : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
unaccounted optimizations : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
rest of compilation : 0.30 ( 1%) 0.01 ( 1%) 0.40 ( 1%)
2089k ( 0%)
unaccounted post reload : 0.01 ( 0%) 0.00 ( 0%) 0.00 ( 0%)
0 ( 0%)
remove unused locals : 0.02 ( 0%) 0.00 ( 0%) 0.03 ( 0%)
0 ( 0%)
address taken : 0.03 ( 0%) 0.00 ( 0%) 0.04 ( 0%)
0 ( 0%)
verify loop closed : 0.05 ( 0%) 0.01 ( 1%) 0.06 ( 0%)
0 ( 0%)
verify RTL sharing : 0.68 ( 2%) 0.00 ( 0%) 0.75 ( 2%)
0 ( 0%)
rebuild frequencies : 0.00 ( 0%) 0.00 ( 0%) 0.01 ( 0%)
0 ( 0%)
repair loop structures : 0.03 ( 0%) 0.00 ( 0%) 0.05 ( 0%)
824 ( 0%)
TOTAL : 34.38 1.11 35.50
660M
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.
```
Anyway, 'gcc -c ./slarith.i -O3 -march=znver2 -m32 -fno-strict-aliasing -fPIC
makes it ICE at least, I'm not able to test many combinations though. Sorry!
```
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/14/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-14.0.9999/work/gcc-14.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/14
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/14/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl,df
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 14.0.9999 p,
commit e6628b8411533cc14470a9404cca9047df81cb0f' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-multilib --with-multilib-list=m32,m64 --disable-fixed-point
--enable-targets=all --enable-libgomp --disable-libssp --disable-libada
--disable-cet --disable-systemtap --disable-valgrind-annotations
--disable-vtable-verify --disable-libvtv --with-zstd --without-isl
--enable-default-pie --enable-host-pie --disable-host-bind-now
--enable-default-ssp --with-build-config='bootstrap-O3 bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240212 (experimental)
f3306a9455f4d2556ba941e5783c94d4bede3b58 (Gentoo 14.0.9999 p, commit
e6628b8411533cc14470a9404cca9047df81cb0f)
```
