in net/bpf_jit.h [966:974]
static inline void emit_sd(u8 rs1, s32 off, u8 rs2, struct rv_jit_context *ctx)
{
if (rvc_enabled() && rs1 == RV_REG_SP && is_9b_uint(off) && !(off & 0x7))
emitc(rvc_sdsp(off, rs2), ctx);
else if (rvc_enabled() && is_creg(rs1) && is_creg(rs2) && is_8b_uint(off) && !(off & 0x7))
emitc(rvc_sd(rs1, off, rs2), ctx);
else
emit(rv_sd(rs1, off, rs2), ctx);
}