checkasm: add RISC-V vector width to arch info

tests/checkasm/checkasm.c

@@ -96,6 +96,8 @@
 
 #if ARCH_AARCH64
 #include "libavutil/aarch64/cpu.h"
+#elif ARCH_RISCV
+#include "libavutil/riscv/cpu.h"
 #endif
 
 #if ARCH_ARM && HAVE_ARMV5TE_EXTERNAL
@@ -993,6 +995,10 @@ int main(int argc, char *argv[])
     if (have_sve(av_get_cpu_flags()))
         snprintf(arch_info_buf, sizeof(arch_info_buf),
                  "SVE %d bits, ", 8 * ff_aarch64_sve_length());
+#elif ARCH_RISCV && HAVE_RVV
+    if (av_get_cpu_flags() & AV_CPU_FLAG_RVV_I32)
+        snprintf(arch_info_buf, sizeof (arch_info_buf),
+                 "%zu-bit vectors, ", 8 * ff_get_rv_vlenb());
 #endif
     fprintf(stderr, "checkasm: %susing random seed %u\n", arch_info_buf, seed);
     av_lfg_init(&checkasm_lfg, seed);