https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111559
Bug ID: 111559
Summary: [14 regression] ICE when building Python with PGO
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
CC: arsen at gcc dot gnu.org
Target Milestone: ---
Unfortunately, Python PGO strikes again.
Originally reported downstream at
https://bugs.gentoo.org/show_bug.cgi?id=914578.
```
gcc-14 -c -fno-strict-overflow -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1
-DNDEBUG -O2 -pipe -march=native -fdiagnostics-color=always
-frecord-gcc-switches -Wreturn-type -ggdb3 -fwrapv -fno-semantic-interposition
-std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
-Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden
-fprofile-use -fprofile-correction -I./Include/internal -I. -I./Include
-I/usr/include/ncursesw -fPIC -DPy_BUILD_CORE -o Parser/parser.o
Parser/parser.c
Parser/parser.c: In function 'simple_stmt_rule':
Parser/parser.c:1706:1: error: probability of edge 613->614 not initialized
1706 | simple_stmt_rule(Parser *p)
| ^~~~~~~~~~~~~~~~
Parser/parser.c:1706:1: error: probability of edge 615->621 not initialized
during IPA pass: inline
Parser/parser.c:1706:1: internal compiler error: verify_flow_info failed
0x55c9cced2153 verify_flow_info()
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cfghooks.cc:287
0x55c9cd4da214 checking_verify_flow_info()
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cfghooks.h:214
0x55c9cd4da214 cleanup_tree_cfg_noloop
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/tree-cfgcleanup.cc:1154
0x55c9cd4da214 cleanup_tree_cfg(unsigned int)
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/tree-cfgcleanup.cc:1205
0x55c9cd330924 execute_function_todo
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/passes.cc:2057
0x55c9cd330e10 execute_todo
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/passes.cc:2142
0x55c9cd333bef execute_one_ipa_transform_pass
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/passes.cc:2336
0x55c9cd333bef execute_all_ipa_transforms(bool)
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/passes.cc:2396
0x55c9ccf13238 cgraph_node::expand()
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cgraphunit.cc:1834
0x55c9ccf13238 cgraph_node::expand()
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cgraphunit.cc:1794
0x55c9ccf141dc expand_all_functions
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cgraphunit.cc:2000
0x55c9ccf141dc symbol_table::compile()
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cgraphunit.cc:2398
0x55c9ccf17a0b symbol_table::compile()
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cgraphunit.cc:2311
0x55c9ccf17a0b symbol_table::finalize_compilation_unit()
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cgraphunit.cc:2583
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
make[1]: *** [Makefile:2717: Parser/parser.o] Error 1
```
I can reproduce it manually, but still with a large reproducer:
* wget https://www.python.org/ftp/python/3.11.5/Python-3.11.5.tar.xz
* tar xvf Python-3.11.5.tar.xz
* ./configure CC=gcc-14 --enable-optimizations
* make -j$(nproc)
