- riscv: test for assembler support
  b3825bbe452c8e4f129fa90bba1fed0ee7b87d71

Index: libavcodec/riscv/pixblockdsp_init.c
--- libavcodec/riscv/pixblockdsp_init.c.orig
+++ libavcodec/riscv/pixblockdsp_init.c
@@ -43,6 +43,7 @@ av_cold void ff_pixblockdsp_init_riscv(PixblockDSPCont
                                        AVCodecContext *avctx,
                                        unsigned high_bit_depth)
 {
+#if HAVE_RV
     int cpu_flags = av_get_cpu_flags();
 
     if (cpu_flags & AV_CPU_FLAG_RVI) {
@@ -61,5 +62,6 @@ av_cold void ff_pixblockdsp_init_riscv(PixblockDSPCont
 
         c->diff_pixels_unaligned = c->diff_pixels = ff_diff_pixels_rvv;
     }
+#endif
 #endif
 }
