https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119519
Bug ID: 119519
Summary: RISC-V, autovectorization, internal compiler error
when "V" RISC-V extension used.
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: k.frolov at samsung dot com
Target Milestone: ---
Created attachment 60909
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60909&action=edit
Example program to reproduce the bug.
Compiler crashes with the message:
internal compiler error: in gen_lowpart_general, at rtlhooks.cc:57
Necessary conditions for the bug reproduction:
* -ftree-vectoriz enabled (or -O2 option is given);
* "V" extension of RISC-V architecture enabled.
Bug can be reproduced only with GCC-14. Bug is not reproduced with GCC-13.
Command line example and diagnostics output is below. Please see example
program in the attachment.
sysop@jupiter:~$ riscv64-linux-gnu-gcc-14 -march=rv64gcv -O1 -ftree-vectorize
-c test11.c -v
Using built-in specs.
COLLECT_GCC=riscv64-linux-gnu-gcc-14
Target: riscv64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
14.2.0-4ubuntu2~24.04' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-14 --enable-shared
--enable-linker-build-id --libexecdir=/usr/libexec --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-libstdcxx-backtrace
--enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support
--enable-plugin --enable-default-pie --with-system-zlib
--enable-libphobos-checking=release --without-target-system-zlib
--enable-multiarch --disable-werror --disable-multilib --with-arch=rv64gc
--with-abi=lp64d --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=riscv64-linux-gnu
--program-prefix=riscv64-linux-gnu- --includedir=/usr/riscv64-linux-gnu/include
--with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.0 (Ubuntu 14.2.0-4ubuntu2~24.04)
COLLECT_GCC_OPTIONS='-march=rv64gcv' '-O1' '-ftree-vectorize' '-c' '-v'
'-mabi=lp64d' '-misa-spec=20191213' '-mtls-dialect=trad'
'-march=rv64imafdcv_zicsr_zifencei_zve32f_zve32x_zve64d_zve64f_zve64x_zvl128b_zvl32b_zvl64b'
/usr/libexec/gcc-cross/riscv64-linux-gnu/14/cc1 -quiet -v -imultilib .
-imultiarch riscv64-linux-gnu test11.c -D_FORTIFY_SOURCE=3 -quiet -dumpbase
test11.c -dumpbase-ext .c -march=rv64gcv -mabi=lp64d -misa-spec=20191213
-mtls-dialect=trad
-march=rv64imafdcv_zicsr_zifencei_zve32f_zve32x_zve64d_zve64f_zve64x_zvl128b_zvl32b_zvl64b
-O1 -version -ftree-vectorize -fstack-protector-strong -Wformat
-Wformat-security -o /tmp/ccky3Y1d.s
GNU C17 (Ubuntu 14.2.0-4ubuntu2~24.04) version 14.2.0 (riscv64-linux-gnu)
compiled by GNU C version 14.2.0, GMP version 6.3.0, MPFR version
4.2.1, MPC version 1.3.1, isl version isl-0.26-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/riscv64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc-cross/riscv64-linux-gnu/14/include-fixed/riscv64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc-cross/riscv64-linux-gnu/14/include-fixed"
ignoring nonexistent directory "/usr/include/riscv64-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc-cross/riscv64-linux-gnu/14/include
/usr/lib/gcc-cross/riscv64-linux-gnu/14/../../../../riscv64-linux-gnu/include
/usr/include
End of search list.
Compiler executable checksum: 676eac2184cb16abfc3a825976555443
during RTL pass: dse1
test11.c: In function ‘v3d71_cmd_buffer_emit_depth_bounds’:
test11.c:105:1: internal compiler error: in gen_lowpart_general, at
rtlhooks.cc:57
105 | }
| ^
0x716cc6a2a1c9 __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
0x716cc6a2a28a __libc_start_main_impl
../csu/libc-start.c:360
