https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116592
--- Comment #5 from Jin Ma <jinma at linux dot alibaba.com> ---
(In reply to nihui from comment #0)
> $ ./riscv64-unknown-linux-gnu-g++ -c test3.c -o test3.o
> -march=rv64gc_zfh_xtheadvector -O2
> /tmp/ccQPGUNc.s: Assembler messages:
> /tmp/ccQPGUNc.s:86: Error: illegal operands `th.vsetvli zero,0,e32,m8'
>
>
> -O1 compiles fine
> -O2 and -O3 gives the above error
>
>
>
>
> $ ./riscv64-unknown-linux-gnu-g++ -v
> Using built-in specs.
> COLLECT_GCC=./riscv64-unknown-linux-gnu-g++
> COLLECT_LTO_WRAPPER=/data/action/osd/riscv/libexec/gcc/riscv64-unknown-linux-
> gnu/15.0.0/lto-wrapper
> Target: riscv64-unknown-linux-gnu
> Configured with: /data/action/osd/riscv-gnu-toolchain/gcc/configure
> --target=riscv64-unknown-linux-gnu --prefix=/data/action/osd/riscv
> --with-sysroot=/data/action/osd/riscv/sysroot --with-pkgversion=g155da081706
> --with-system-zlib --enable-shared --enable-tls
> --enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
> --disable-libquadmath --disable-libsanitizer --disable-nls
> --disable-bootstrap --src=.././gcc --disable-default-pie --disable-multilib
> --with-abi=lp64d --with-arch=rv64imafdc --with-tune=rocket
> --with-isa-spec=20191213 'CFLAGS_FOR_TARGET=-O2 -mcmodel=medlow'
> 'CXXFLAGS_FOR_TARGET=-O2 -mcmodel=medlow'
> Thread model: posix
> Supported LTO compression algorithms: zlib
> gcc version 15.0.0 20240829 (experimental) (g155da081706)
>
>
>
> binutils master branch
>
> commit 5cca20f614694ba6af3c10ca5bb93c32cdb9522b (HEAD -> master,
> origin/master, origin/HEAD)
> Author: GDB Administrator <gdbad...@sourceware.org>
> Date: Thu Aug 29 00:00:14 2024 +0000
>
> Automatic date update in version.in
>
>
>
> ------------- soucecode -------------
>
>
> #include <math.h>
> #include <riscv_vector.h>
>
> static vfloat32m8_t atan2_ps(vfloat32m8_t a, vfloat32m8_t b, size_t vl)
> {
> float tmpx[vl];
> float tmpy[vl];
> __riscv_vse32_v_f32m8(tmpx, a, vl);
> __riscv_vse32_v_f32m8(tmpy, b, vl);
> for (size_t i = 0; i < vl; i++)
> {
> tmpx[i] = atan2(tmpx[i], tmpy[i]);
> }
> return __riscv_vle32_v_f32m8(tmpx, vl);
> }
>
> void my_atan2(const float* x, const float* y, float* out, int size)
> {
> int n = size;
> while (n > 0)
> {
> size_t vl = __riscv_vsetvl_e32m8(n);
> vfloat32m8_t _x = __riscv_vle32_v_f32m8(x, vl);
> vfloat32m8_t _y = __riscv_vle32_v_f32m8(y, vl);
> vfloat32m8_t _out = atan2_ps(_x, _y, vl);
> __riscv_vse32_v_f32m8(out, _out, vl);
> n -= vl;
> x += vl;
> y += vl;
> out += vl;
> }
> }
I tried to fix this issue, see the patch below link:
https://gcc.gnu.org/pipermail/gcc-patches/2024-September/662463.html
BR
Jin
