https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123969
Bug ID: 123969
Summary: [riscv64, xtheadvector] app built with gcc-15.2
crashes with SIGILL
Product: gcc
Version: 15.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: jpegqs at gmail dot com
Target Milestone: ---
Created attachment 63583
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63583&action=edit
jpegqs_test2.zip
You need libjpeg-dev to build this.
$ gcc-15 -O1 -march=rv64gc_xtheadvector -o jpegqs quantsmooth.c -ljpeg -lm
$ ./jpegqs -i8 -q6 test.jpg out.jpg
Illegal instruction ./jpegqs -i8 -q6 test.jpg out.jpg
$ gcc-15 -v
Using built-in specs.
COLLECT_GCC=gcc-15
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/riscv64-linux-gnu/15/lto-wrapper
Target: riscv64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 15.2.0-12'
--with-bugurl=file:///usr/share/doc/gcc-15/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust,cobol,algol68
--prefix=/usr --with-gcc-major-version-only --program-suffix=-15
--program-prefix=riscv64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --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
--with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch
--disable-werror --disable-multilib --with-abi=lp64d --with-arch=rv64gc
--enable-checking=release --build=riscv64-linux-gnu --host=riscv64-linux-gnu
--target=riscv64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.2.0 (Debian 15.2.0-12)
Some info from GDB:
Program received signal SIGILL, Illegal instruction.
Line 1498 of "quantsmooth.h"
0x2aaaaad118 <main+6386>: addi a3,sp,24
0x2aaaaad11a <main+6388>: th.vsetvli zero,s8,e32,m2,d1
=> 0x2aaaaad11e <main+6392>: th.vlse.v v7,(a3),zero
0x2aaaaad122 <main+6396>: th.vmv.v.i v10,0
0x2aaaaad126 <main+6400>: th.vsetvli zero,zero,e32,m2,d1
0x2aaaaad12a <main+6404>: th.vmv.v.v v12,v10
0x2aaaaad12e <main+6408>: slliw a3,a5,0x3
0x2aaaaad132 <main+6412>: slli a1,a3,0x1
0x2aaaaad136 <main+6416>: add a1,a1,s1
0x2aaaaad138 <main+6418>: th.vsetvli zero,s8,e16,m1,d1
