WIP: modules/zstd: Add proc for generating FSE lookup

Internal-tag: [#57353]
Signed-off-by: Robert Winkler <rwinkler@antmicro.com>

xls/modules/zstd/BUILD

@@ -1185,3 +1185,20 @@ xls_dslx_test(
     dslx_test_args = {"compare": "none"},
     library = ":fse_table_iterator_dslx",
 )
+
+xls_dslx_library(
+    name = "fse_table_creator_dslx",
+    srcs = ["fse_table_creator.x"],
+    deps = [
+        ":common_dslx",
+        ":fse_common_dslx",
+        ":ram_wr_handler_dslx",
+        "//xls/examples:ram_dslx",
+    ],
+)
+
+xls_dslx_test(
+    name = "fse_table_creator_dslx_test",
+    dslx_test_args = {"compare": "none"},
+    library = ":fse_table_creator_dslx",
+)

xls/modules/zstd/fse_table_creator.x

@@ -0,0 +1,169 @@
+// Copyright 2024 The XLS Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import std;
+import xls.examples.ram;
+import xls.modules.zstd.common;
+import xls.modules.zstd.ram_wr_handler as ram_wr;
+import xls.modules.zstd.fse_common as fse;
+
+type DecoderCtrl = fse::FSEProbaFreqDecoderCtrl;
+
+enum FSETableIteratorStatus: u1 {
+    CONFIGURE = 0,
+    SEND = 1,
+}
+
+struct FSETableCreatorCtrl {
+    accuracy_log: u32,
+    negative_proba_count: u32,
+}
+
+proc FSETableIteratorState {
+    status: FSETableIteratorStatus,
+    ctrl: FSETableIteratorCtrl
+}
+
+proc FSETableIterator {
+    type Status = FSETableIteratorStatus;
+    type State = FSETableIteratorState;
+    struct Ctrl = FSETableCreatorCtrl;
+
+    type Reset = bool;
+    type Index = u32;
+
+    ctrl_r: chan<Ctrl> in;
+    resp_s: chan<Index> out;
+
+    config(
+        req_r: chan<Reset> in;
+        resp_s: chan<Index> out;
+    ) { (req_r, resp_s) }
+
+    next(tok0: token, state: State) {
+        let do_recv_ctrl = state.status == Status::CONFIGURE;
+        let (tok, ctrl) = recv_if(tok, ctrl_r, do_recv_ctrl, zero!<Ctrl>());
+
+        let new_state = match (state.status) {
+            Status::CONFIGURE => {
+                State { ctrl, status: Status::SEND }
+            },
+            Status::SEND => {
+                state
+            },
+            _ => {
+                fail!("incorrect_state", zero!<State>);
+            },
+        }
+
+        new_state
+    }
+}
+
+struct FSETableCreatorState {
+    rd_cnt: u32,
+    wr_cnt: u32,
+}
+
+
+proc FSETableCreator<
+    RAM_DATA_WIDTH: u32,
+    RAM_SIZE: u32,
+    RAM_WORD_PARTITION_SIZE: u32,
+    RAM_ADDR_WIDTH: u32 = {std::clog2(RAM_SIZE)},
+    RAM_NUM_PARTITIONS: u32 = {ram::num_partitions(RAM_WORD_PARTITION_SIZE, RAM_DATA_WIDTH)},
+> {
+    type State = FSETableCreatorState;
+
+    type RamWriteReq = ram::WriteReq<RAM_ADDR_WIDTH, RAM_DATA_WIDTH, RAM_NUM_PARTITIONS>;
+    type RamWriteResp = ram::WriteResp;
+    type RamReadReq = ram::ReadReq<RAM_ADDR_WIDTH, RAM_NUM_PARTITIONS>;
+    type RamReadResp = ram::ReadResp<RAM_DATA_WIDTH>;
+    type RamAddr = bits[RAM_ADDR_WIDTH];
+    type RamData = bits[RAM_DATA_WIDTH];
+
+    resp_in_s: chan<bool> out;
+    resp_out_r: chan<u32> in;
+
+    rd_req_s: chan<RamReadReq> out;
+    rd_resp_r: chan<RamReadResp> in;
+    wr_req_s: chan<RamWriteReq> out;
+    wr_resp_r: chan<RamWriteResp> in;
+
+    config(
+        rd_req_s: chan<RamReadReq> out,
+        rd_resp_r: chan<RamReadResp> in,
+        wr_req_s: chan<RamWriteReq> out,
+        wr_resp_r: chan<RamWriteResp> in) {
+
+        let (resp_in_s, resp_in_r) = chan<bool, u32:1>;
+        let (resp_out_s, resp_out_r) = chan<u32, u32:1>;
+
+        spawn ram_wr::RamWrRespHandler(resp_in_r, resp_out_s, wr_resp_r);
+        (
+            resp_in_s, resp_out_r,
+            rd_req_s, rd_resp_r, wr_req_s, wr_resp_r,
+        )
+    }
+
+    init { zero!<State>() }
+
+    next(tok0: token, state: State) {
+        state
+    }
+}
+
+const TEST_RAM_DATA_WIDTH = u32:8;
+const TEST_RAM_SIZE = u32:256;
+const TEST_RAM_ADDR_WIDTH = std::clog2(TEST_RAM_SIZE);
+const TEST_RAM_WORD_PARTITION_SIZE = TEST_RAM_DATA_WIDTH;
+const TEST_RAM_NUM_PARTITIONS = ram::num_partitions(TEST_RAM_WORD_PARTITION_SIZE, TEST_RAM_DATA_WIDTH);
+
+#[test_proc]
+proc FSETableCreatorTest {
+    type ReadReq = ram::ReadReq<TEST_RAM_ADDR_WIDTH, TEST_RAM_NUM_PARTITIONS>;
+    type ReadResp = ram::ReadResp<TEST_RAM_DATA_WIDTH>;
+    type WriteReq = ram::WriteReq<TEST_RAM_ADDR_WIDTH, TEST_RAM_DATA_WIDTH, TEST_RAM_NUM_PARTITIONS>;
+    type WriteResp = ram::WriteResp;
+
+    terminator: chan<bool> out;
+
+    rd_req_s: chan<ReadReq> out;
+    rd_resp_r: chan<ReadResp> in;
+    wr_req_s: chan<WriteReq> out;
+    wr_resp_r: chan<WriteResp> in;
+
+    config(terminator: chan<bool> out) {
+        let (rd_req_s, rd_req_r) = chan<ReadReq>;
+        let (rd_resp_s, rd_resp_r) = chan<ReadResp>;
+        let (wr_req_s, wr_req_r) = chan<WriteReq>;
+        let (wr_resp_s, wr_resp_r) = chan<WriteResp>;
+
+        spawn FSETableCreator<TEST_RAM_DATA_WIDTH, TEST_RAM_SIZE, TEST_RAM_WORD_PARTITION_SIZE>(
+            rd_req_s, rd_resp_r, wr_req_s, wr_resp_r);
+
+        spawn ram::RamModel<TEST_RAM_DATA_WIDTH, TEST_RAM_SIZE, TEST_RAM_WORD_PARTITION_SIZE>(
+            rd_req_r, rd_resp_s, wr_req_r, wr_resp_s);
+
+        (   terminator,
+            rd_req_s, rd_resp_r, wr_req_s, wr_resp_r
+        )
+    }
+
+    init {  }
+
+    next(tok: token, state: ()) {
+        let tok = send(tok, terminator, true);
+    }
+}