Any Idea, why is vmv.x.s always generated with rd=zero ?

[algrobman]

grep vmv.x.s riscvdv/out_2025-04-08/asm_test/*
riscvdv/out_2025-04-08/asm_test/riscv_vector_arithmetic_test_0.S: vmv.x.s zero,v17
riscvdv/out_2025-04-08/asm_test/riscv_vector_arithmetic_test_0.S: vmv.x.s zero,v4
riscvdv/out_2025-04-08/asm_test/riscv_vector_arithmetic_test_0.S: vmv.x.s zero,v28
riscvdv/out_2025-04-08/asm_test/riscv_vector_arithmetic_test_0.S: vmv.x.s zero,v19
riscvdv/out_2025-04-08/asm_test/riscv_vector_arithmetic_test_0.S: vmv.x.s zero,v28
riscvdv/out_2025-04-08/asm_test/riscv_vector_arithmetic_test_0.S: vmv.x.s zero,v16
....
( seems all vector instructions using 'rd' have 'rd' not randomized ...)

[algrobman]

the same issue is for vfmv.f.s - always selects ft0 FPR ...

[algrobman]

I fixed this in
riscvdv/src/isa/riscv_vector_instr.sv:

virtual function void set_rand_mode();
string name = instr_name.name();
has_rs1 = 1;
has_rs2 = 0;
has_rd = 1;
has_fs1 = 0;
has_fs2 = 0;
has_fs3 = 0;
has_fd = 1;
has_imm = 0;