REG_Y
ps->pr_lwp.pr_reg[R_Y] = cp->user.u_reg[REG_Y];
ps->pr_lwp.pr_reg[R_Y] = cp->user.u_reg[REG_Y];
cp->user.u_reg[REG_Y] = ps->pr_lwp.pr_reg[R_Y];
dst[R_Y] = gregs[REG_Y];
dst[R_Y] = gregs[REG_Y];
dst[R_Y] = (uint64_t)(uint32_t)gregs[REG_Y];
prp[R_Y] = gr[REG_Y];
gr[REG_Y] = prp[R_Y];
prp[R_Y] = gr[REG_Y];
rp->r_y = grp[REG_Y];
grp[REG_Y] = (uint32_t)rp->r_y;
grp[REG_Y] = rp->r_y;