[Bug target/116590] New: unrecognized opcode th.vmv8r.v th.vfrec7.v when compiling for risc-v xtheadvector

[shuizhuyuanluo at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116590

            Bug ID: 116590
           Summary: unrecognized opcode th.vmv8r.v th.vfrec7.v when
                    compiling for risc-v xtheadvector
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shuizhuyuanluo at gmail dot com
  Target Milestone: ---

riscv64-unknown-linux-gnu-g++ test2.c -o test2 -march=rv64gc_zfh_xtheadvector
/tmp/cc3hCdvO.s: Assembler messages:
/tmp/cc3hCdvO.s:97: Error: unrecognized opcode `th.vmv8r.v v8,v16'
/tmp/cc3hCdvO.s:226: Error: unrecognized opcode `th.vfrec7.v v8,v8'
$ ./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) 



#include <stdio.h>
#include <time.h>

#include <riscv_vector.h>

void vmv8r()
{
    float x[32];
    for (int i = 0; i < 32; i++)
    {
        x[i] = time(NULL);
    }

    size_t vl = __riscv_vsetvl_e32m8(32);
    vfloat32m8_t _p = __riscv_vle32_v_f32m8(x, vl);

    _p = __riscv_vfmacc_vf_f32m8(__riscv_vfmv_v_f_f32m8(0.5f, vl), 1.442, _p,
vl);

    __riscv_vse32_v_f32m8(x, _p, vl);

    fprintf(stderr, "%f\n", x[0]);
}

void vfrec7()
{
    float x[32];
    for (int i = 0; i < 32; i++)
    {
        x[i] = time(NULL);
    }

    size_t vl = __riscv_vsetvl_e32m8(32);
    vfloat32m8_t _p = __riscv_vle32_v_f32m8(x, vl);

    _p = __riscv_vfrec7_v_f32m8(_p, vl);

    __riscv_vse32_v_f32m8(x, _p, vl);

    fprintf(stderr, "%f\n", x[0]);
}

int main()
{
    vmv8r();
    vfrec7();
    return 0;
}