On 4/11/19 12:08 AM, David Hildenbrand wrote:
> +void HELPER(gvec_vtm)(void *v1, const void *v2, CPUS390XState *env,
> + uint32_t desc)
> +{
> + S390Vector tmp;
> +
> + s390_vec_and(&tmp, v1, v2);
> + if (s390_vec_is_zero(&tmp)) {
> + /* Selected bits all zeros; or all mask bits zero */
> + env->cc_op = 0;
> + } else if (s390_vec_equal(&tmp, v2)) {
> + /* Selected bits all ones */
> + env->cc_op = 3;
> + } else {
> + /* Selected bits a mix of zeros and ones */
> + env->cc_op = 1;
> + }
> +}
Reviewed-by: Richard Henderson <[email protected]>
However, if you return this value, then you can do
DEF_HELPER_FLAGS_4(gvec_vtm, TCG_CALL_NO_RWG_SE, i32, cptr, cptr)
static DisasJumpType op_vtm(DisasContext *s, DisasOps *o)
{
TCGv_ptr p1 = tcg_temp_new_ptr();
TCGv_ptr p2 = tcg_temp_new_ptr();
tcg_gen_addi_ptr(p1, cpu_env,
vec_full_reg_offset(get_field(s->fields, v1)));
tcg_gen_addi_ptr(p2, cpu_env,
vec_full_reg_offset(get_field(s->fields, v2)));
gen_helper_gvec_vtm(cc_op, p1, p2);
tcg_temp_free_ptr(p1);
tcg_temp_free_ptr(p2);
set_cc_static(s);
return DISAS_NEXT;
}
Perhaps it doesn't matter though, since use of vtm probably implies a jump,
which implies end of TB, which means that registers are going to get saved to
backing store anyway.
r~
