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// SPDX-License-Identifier: Apache-2.0
use indexmap::IndexMap;
use crate::{Intf, ModDef};
impl Intf {
/// Divides each signal in this interface into `n` equal slices, returning a
/// vector of interfaces. For example, if this interface is `{"data":
/// "a_data[31:0]", "valid": "a_valid[3:0]"}` and `n` is 4, this will return
/// a vector of 4 interfaces, each with signals `{"data": "a_data[7:0]",
/// "valid": "a_valid[0:0]"}`, `{"data": "a_data[15:8]", "valid":
/// "a_valid[1:1]"}`, and so on. The names of the new interfaces are formed
/// by appending "_0", "_1", "_2", and so on to the name of this interface;
/// these names can be used to retrieve specific slices of the interface
/// with `get_intf`.
pub fn subdivide(&self, n: usize) -> Vec<Intf> {
let mut result = Vec::new();
let mut mappings: Vec<IndexMap<String, (String, usize, usize)>> = Vec::with_capacity(n);
for _ in 0..n {
mappings.push(IndexMap::new());
}
for (func_name, port_slice) in self.get_port_slices() {
let slices = port_slice.subdivide(n);
for (i, slice) in slices.into_iter().enumerate() {
let port_name = port_slice.port.get_port_name();
mappings[i].insert(func_name.clone(), (port_name.clone(), slice.msb, slice.lsb));
}
}
for i in 0..n {
let intf = match self {
Intf::ModDef { name, .. } => {
let name = format!("{name}_{i}");
ModDef {
core: self.get_mod_def_core(),
}
.def_intf(&name, mappings.remove(0))
}
_ => panic!(
"Error subdividing {}: subdividing ModInst interfaces is not supported.",
self.debug_string()
),
};
result.push(intf);
}
result
}
}