https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117493
Bug ID: 117493
Summary: ICE when building llvm-18.1.8 with -O3
-fno-tree-forwprop
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 59563
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59563&action=edit
Operator.cpp.ii.xz
```
$ g++
../llvm_build-abi_x86_64.amd64/lib/IR/CMakeFiles/LLVMCore.dir/Operator.cpp.ii
-c -O3 -fno-tree-forwprop
g++: internal compiler error: Segmentation fault signal terminated program
cc1plus
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://bugs.gentoo.org/> for instructions.
```
```
$ g++
../llvm_build-abi_x86_64.amd64/lib/IR/CMakeFiles/LLVMCore.dir/Operator.cpp.ii
-c -O3 -fno-tree-forwprop -wrapper valgrind
==13960== Conditional jump or move depends on uninitialised value(s)
==13960== at 0x2967E0D: UnknownInlinedFun (sparseset.h:146)
==13960== by 0x2967E0D: mark_pseudo_regno_live(int) [clone .lto_priv.0]
(ira-lives.cc:327)
==13960== by 0x2956067: UnknownInlinedFun (ira-lives.cc:411)
==13960== by 0x2956067: UnknownInlinedFun (ira-lives.cc:425)
==13960== by 0x2956067: process_bb_node_lives(ira_loop_tree_node*)
(ira-lives.cc:1512)
==13960== by 0x29318DD: ira_traverse_loop_tree(bool, ira_loop_tree_node*,
void (*)(ira_loop_tree_node*), void (*)(ira_loop_tree_node*))
(ira-build.cc:1809)
==13960== by 0x2953218: ira_create_allocno_live_ranges() (ira-lives.cc:1812)
==13960== by 0x2927F7C: ira_build() (ira-build.cc:3491)
==13960== by 0x28D9924: UnknownInlinedFun (ira.cc:5797)
==13960== by 0x28D9924: (anonymous namespace)::pass_ira::execute(function*)
[clone .lto_priv.0] (ira.cc:6121)
==13960== by 0x787D7C: execute_one_pass(opt_pass*) [clone .cold]
(passes.cc:2660)
==13960== by 0x24629BB: execute_pass_list_1(opt_pass*) [clone .lto_priv.0]
(passes.cc:2769)
==13960== by 0x24629D8: execute_pass_list_1(opt_pass*) [clone .lto_priv.0]
(passes.cc:2770)
==13960== by 0x245C398: execute_pass_list(function*, opt_pass*)
(passes.cc:2780)
==13960== by 0x23C15B0: cgraph_node::expand() (cgraphunit.cc:1846)
==13960== by 0x2344A25: UnknownInlinedFun (cgraphunit.cc:2029)
==13960== by 0x2344A25: symbol_table::compile() (cgraphunit.cc:2405)
==13960==
==13960== Conditional jump or move depends on uninitialised value(s)
==13960== at 0x2967F0F: UnknownInlinedFun (sparseset.h:146)
==13960== by 0x2967F0F: UnknownInlinedFun (sparseset.h:165)
==13960== by 0x2967F0F: UnknownInlinedFun (ira-lives.cc:127)
==13960== by 0x2967F0F: mark_pseudo_regno_live(int) [clone .lto_priv.0]
(ira-lives.cc:331)
==13960== by 0x2956067: UnknownInlinedFun (ira-lives.cc:411)
==13960== by 0x2956067: UnknownInlinedFun (ira-lives.cc:425)
==13960== by 0x2956067: process_bb_node_lives(ira_loop_tree_node*)
(ira-lives.cc:1512)
==13960== by 0x29318DD: ira_traverse_loop_tree(bool, ira_loop_tree_node*,
void (*)(ira_loop_tree_node*), void (*)(ira_loop_tree_node*))
(ira-build.cc:1809)
==13960== by 0x2953218: ira_create_allocno_live_ranges() (ira-lives.cc:1812)
==13960== by 0x2927F7C: ira_build() (ira-build.cc:3491)
==13960== by 0x28D9924: UnknownInlinedFun (ira.cc:5797)
==13960== by 0x28D9924: (anonymous namespace)::pass_ira::execute(function*)
[clone .lto_priv.0] (ira.cc:6121)
==13960== by 0x787D7C: execute_one_pass(opt_pass*) [clone .cold]
(passes.cc:2660)
==13960== by 0x24629BB: execute_pass_list_1(opt_pass*) [clone .lto_priv.0]
(passes.cc:2769)
==13960== by 0x24629D8: execute_pass_list_1(opt_pass*) [clone .lto_priv.0]
(passes.cc:2770)
==13960== by 0x245C398: execute_pass_list(function*, opt_pass*)
(passes.cc:2780)
==13960== by 0x23C15B0: cgraph_node::expand() (cgraphunit.cc:1846)
==13960== by 0x2344A25: UnknownInlinedFun (cgraphunit.cc:2029)
==13960== by 0x2344A25: symbol_table::compile() (cgraphunit.cc:2405)
[...]
```
```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/15/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/15
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/15/python
--enable-objc-gc --enable-languages=c,c++,d,go,objc,obj-c++,fortran,ada,rust
--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 15.0.9999 p, commit
5f55e0a35a6595391420057c748c94110a41cacd' --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 --enable-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 --disable-fixincludes --with-build-config='bootstrap-O3
bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20241107 (experimental)
2a2e6784074e1f7b679bc09b1a66982bf60645a5 (Gentoo 15.0.9999 p, commit
5f55e0a35a6595391420057c748c94110a41cacd)
```
