mirror of https://github.com/YosysHQ/yosys.git
Add first draft of simple C back-end
This commit is contained in:
parent
241dc7dfb4
commit
bd4ed19887
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test00_tb
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test00_uut.c
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OBJS += backends/simplec/simplec.o
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/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include "kernel/yosys.h"
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#include "kernel/sigtools.h"
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USING_YOSYS_NAMESPACE
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PRIVATE_NAMESPACE_BEGIN
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struct HierDirtyFlags;
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struct HierDirtyFlags
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{
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int dirty;
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Module *module;
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IdString hiername;
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HierDirtyFlags *parent;
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pool<SigBit> dirty_bits;
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pool<Cell*> dirty_cells;
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dict<IdString, HierDirtyFlags*> children;
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HierDirtyFlags(Module *module, IdString hiername, HierDirtyFlags *parent) : dirty(0), module(module), hiername(hiername), parent(parent)
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{
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for (Cell *cell : module->cells()) {
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Module *mod = module->design->module(cell->type);
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if (mod) children[cell->name] = new HierDirtyFlags(mod, cell->name, this);
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}
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}
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~HierDirtyFlags()
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{
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for (auto &child : children)
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delete child.second;
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}
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void set_dirty(SigBit bit)
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{
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if (dirty_bits.count(bit))
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return;
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dirty_bits.insert(bit);
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HierDirtyFlags *p = this;
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while (p != nullptr) {
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p->dirty++;
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p = p->parent;
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}
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}
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void unset_dirty(SigBit bit)
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{
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if (dirty_bits.count(bit) == 0)
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return;
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dirty_bits.erase(bit);
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HierDirtyFlags *p = this;
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while (p != nullptr) {
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p->dirty--;
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log_assert(p->dirty >= 0);
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p = p->parent;
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}
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}
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void set_dirty(Cell *cell)
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{
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if (dirty_cells.count(cell))
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return;
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dirty_cells.insert(cell);
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HierDirtyFlags *p = this;
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while (p != nullptr) {
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p->dirty++;
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p = p->parent;
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}
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}
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void unset_dirty(Cell *cell)
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{
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if (dirty_cells.count(cell) == 0)
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return;
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dirty_cells.erase(cell);
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HierDirtyFlags *p = this;
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while (p != nullptr) {
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p->dirty--;
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log_assert(p->dirty >= 0);
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p = p->parent;
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}
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}
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};
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struct SimplecWorker
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{
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bool verbose = false;
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int max_uintsize = 32;
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Design *design;
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dict<Module*, SigMap> sigmaps;
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HierDirtyFlags *dirty_flags = nullptr;
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vector<string> signal_declarations;
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pool<int> generated_sigtypes;
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vector<string> util_declarations;
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pool<string> generated_utils;
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vector<string> struct_declarations;
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pool<IdString> generated_structs;
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vector<string> funct_declarations;
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pool<string> reserved_cids;
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dict<IdString, string> id2cid;
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dict<Module*, dict<SigBit, pool<tuple<Cell*, IdString, int>>>> bit2cell;
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dict<Module*, dict<SigBit, pool<SigBit>>> bit2output;
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SimplecWorker(Design *design) : design(design)
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{
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}
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string sigtype(int n)
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{
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string struct_name = stringf("signal%d_t", n);
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if (generated_sigtypes.count(n) == 0)
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{
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signal_declarations.push_back("");
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signal_declarations.push_back(stringf("#ifndef YOSYS_SIMPLEC_SIGNAL%d_T", n));
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signal_declarations.push_back(stringf("#define YOSYS_SIMPLEC_SIGNAL%d_T", n));
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signal_declarations.push_back(stringf("typedef struct {"));
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for (int k = 8; k <= max_uintsize; k = 2*k)
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if (n <= k && k <= max_uintsize) {
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signal_declarations.push_back(stringf(" uint%d_t value_%d_0 : %d;", k, n-1, n));
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goto end_struct;
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}
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for (int k = 0; k < n; k += max_uintsize) {
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int bits = std::min(max_uintsize, n-k);
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signal_declarations.push_back(stringf(" uint%d_t value_%d_%d : %d;", max_uintsize, k+bits-1, k, bits));
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}
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end_struct:
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signal_declarations.push_back(stringf("} signal%d_t;", n));
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signal_declarations.push_back(stringf("#endif"));
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generated_sigtypes.insert(n);
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}
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return struct_name;
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}
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void util_ifdef_guard(string s)
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{
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for (int i = 0; i < GetSize(s); i++)
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if ('a' <= s[i] && s[i] <= 'z')
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s[i] -= 'a' - 'A';
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util_declarations.push_back(stringf("#ifndef %s", s.c_str()));
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util_declarations.push_back(stringf("#define %s", s.c_str()));
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}
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string util_get_bit(int n, int idx)
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{
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string util_name = stringf("yosys_simplec_get_bit_%d_of_%d", idx, n);
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if (generated_utils.count(util_name) == 0)
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{
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util_ifdef_guard(util_name);
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util_declarations.push_back(stringf("bool %s(const %s *sig)", util_name.c_str(), sigtype(n).c_str()));
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util_declarations.push_back(stringf("{"));
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int word_idx = idx / max_uintsize, word_offset = idx % max_uintsize;
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string value_name = stringf("value_%d_%d", std::min(n-1, (word_idx+1)*max_uintsize-1), word_idx*max_uintsize);
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util_declarations.push_back(stringf(" return (sig->%s >> %d) & 1;", value_name.c_str(), word_offset));
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util_declarations.push_back(stringf("}"));
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util_declarations.push_back(stringf("#endif"));
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generated_utils.insert(util_name);
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}
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return util_name;
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}
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string util_set_bit(int n, int idx)
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{
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string util_name = stringf("yosys_simplec_set_bit_%d_of_%d", idx, n);
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if (generated_utils.count(util_name) == 0)
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{
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util_ifdef_guard(util_name);
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util_declarations.push_back(stringf("void %s(%s *sig, bool value)", util_name.c_str(), sigtype(n).c_str()));
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util_declarations.push_back(stringf("{"));
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int word_idx = idx / max_uintsize, word_offset = idx % max_uintsize;
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string value_name = stringf("value_%d_%d", std::min(n-1, (word_idx+1)*max_uintsize-1), word_idx*max_uintsize);
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util_declarations.push_back(stringf(" if (value)"));
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util_declarations.push_back(stringf(" sig->%s |= 1UL << %d;", value_name.c_str(), word_offset));
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util_declarations.push_back(stringf(" else"));
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util_declarations.push_back(stringf(" sig->%s &= ~(1UL << %d);", value_name.c_str(), word_offset));
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util_declarations.push_back(stringf("}"));
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util_declarations.push_back(stringf("#endif"));
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generated_utils.insert(util_name);
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}
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return util_name;
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}
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string cid(IdString id)
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{
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if (id2cid.count(id) == 0)
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{
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string s = id.str();
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if (GetSize(s) < 2) log_abort();
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if (s[0] == '\\')
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s = s.substr(1);
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if ('0' <= s[0] && s[0] <= '9') {
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s = "_" + s;
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}
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for (int i = 0; i < GetSize(s); i++) {
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if ('0' <= s[i] && s[i] <= '9') continue;
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if ('A' <= s[i] && s[i] <= 'Z') continue;
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if ('a' <= s[i] && s[i] <= 'z') continue;
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s[i] = '_';
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}
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while (reserved_cids.count(s))
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s += "_";
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reserved_cids.insert(s);
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id2cid[id] = s;
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}
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return id2cid.at(id);
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}
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void create_module_struct(Module *mod)
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{
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if (generated_structs.count(mod->name))
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return;
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generated_structs.insert(mod->name);
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sigmaps[mod].set(mod);
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for (Wire *w : mod->wires())
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{
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if (w->port_output)
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for (auto bit : SigSpec(w))
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bit2output[mod][sigmaps.at(mod)(bit)].insert(bit);
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}
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for (Cell *c : mod->cells())
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{
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for (auto &conn : c->connections())
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{
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if (!c->input(conn.first))
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continue;
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int idx = 0;
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for (auto bit : sigmaps.at(mod)(conn.second))
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bit2cell[mod][bit].insert(tuple<Cell*, IdString, int>(c, conn.first, idx++));
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}
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if (design->module(c->type))
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create_module_struct(design->module(c->type));
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}
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struct_declarations.push_back("");
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struct_declarations.push_back(stringf("struct %s_state_t {", cid(mod->name).c_str()));
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for (Wire *w : mod->wires())
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struct_declarations.push_back(stringf(" %s %s; // %s", sigtype(w->width).c_str(), cid(w->name).c_str(), log_id(w)));
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for (Cell *c : mod->cells())
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if (design->module(c->type))
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struct_declarations.push_back(stringf(" struct %s_state_t %s; // %s", cid(c->type).c_str(), cid(c->name).c_str(), log_id(c)));
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struct_declarations.push_back(stringf("};"));
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}
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void eval_cell(HierDirtyFlags *work, string &prefix, string &/* log_prefix */, Cell *cell)
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{
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if (cell->type.in("$_AND_", "$_NAND_", "$_OR_", "$_NOR_", "$_XOR_", "$_XNOR"))
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{
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SigBit a = sigmaps.at(work->module)(cell->getPort("\\A"));
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SigBit b = sigmaps.at(work->module)(cell->getPort("\\B"));
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SigBit y = sigmaps.at(work->module)(cell->getPort("\\Y"));
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string a_expr = a.wire ? stringf("%s(&%s)", util_get_bit(a.wire->width, a.offset).c_str(), (prefix + cid(a.wire->name)).c_str()) : a.data ? "1" : "0";
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string b_expr = b.wire ? stringf("%s(&%s)", util_get_bit(b.wire->width, b.offset).c_str(), (prefix + cid(b.wire->name)).c_str()) : b.data ? "1" : "0";
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string expr;
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if (cell->type == "$_AND_") expr = stringf("%s & %s", a_expr.c_str(), b_expr.c_str());
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if (cell->type == "$_NAND_") expr = stringf("!(%s & %s)", a_expr.c_str(), b_expr.c_str());
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if (cell->type == "$_OR_") expr = stringf("%s | %s", a_expr.c_str(), b_expr.c_str());
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if (cell->type == "$_NOR_") expr = stringf("!(%s | %s)", a_expr.c_str(), b_expr.c_str());
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if (cell->type == "$_XOR_") expr = stringf("%s ^ %s", a_expr.c_str(), b_expr.c_str());
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if (cell->type == "$_XNOR_") expr = stringf("!(%s ^ %s)", a_expr.c_str(), b_expr.c_str());
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log_assert(y.wire);
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funct_declarations.push_back(stringf(" %s(&%s, %s); // %s (%s)", util_set_bit(y.wire->width, y.offset).c_str(),
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(prefix + cid(y.wire->name)).c_str(), expr.c_str(), log_id(cell), log_id(cell->type)));
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work->set_dirty(y);
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return;
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}
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log_error("No C model for %s available at the moment (FIXME).\n", log_id(cell->type));
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}
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void eval_dirty(HierDirtyFlags *work, string prefix, string log_prefix, string parent_prefix)
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{
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while (work->dirty)
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{
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while (!work->dirty_bits.empty() || !work->dirty_cells.empty())
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{
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if (!work->dirty_bits.empty())
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{
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SigSpec dirtysig(work->dirty_bits);
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dirtysig.sort_and_unify();
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for (SigChunk chunk : dirtysig.chunks())
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funct_declarations.push_back(stringf(" // New dirty bits in %s: %s", log_prefix.c_str(), log_signal(chunk)));
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for (SigBit bit : dirtysig)
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{
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if (bit2output[work->module].count(bit) && work->parent)
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for (auto outbit : bit2output[work->module][bit])
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{
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Module *parent_mod = work->parent->module;
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Cell *parent_cell = parent_mod->cell(work->hiername);
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IdString port_name = outbit.wire->name;
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int port_offset = outbit.offset;
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||||||
|
SigBit parent_bit = sigmaps.at(parent_mod)(parent_cell->getPort(port_name)[port_offset]);
|
||||||
|
|
||||||
|
log_assert(bit.wire && parent_bit.wire);
|
||||||
|
funct_declarations.push_back(stringf(" %s(&%s, %s(&%s));",
|
||||||
|
util_set_bit(parent_bit.wire->width, parent_bit.offset).c_str(),
|
||||||
|
(parent_prefix + cid(parent_bit.wire->name)).c_str(),
|
||||||
|
util_get_bit(bit.wire->width, bit.offset).c_str(),
|
||||||
|
(prefix + cid(bit.wire->name)).c_str()));
|
||||||
|
work->parent->set_dirty(parent_bit);
|
||||||
|
}
|
||||||
|
|
||||||
|
for (auto &port : bit2cell[work->module][bit])
|
||||||
|
{
|
||||||
|
if (work->children.count(std::get<0>(port)->name)) {
|
||||||
|
HierDirtyFlags *child = work->children.at(std::get<0>(port)->name);
|
||||||
|
SigBit child_bit = sigmaps.at(child->module)(SigBit(child->module->wire(std::get<1>(port)), std::get<2>(port)));
|
||||||
|
log_assert(bit.wire && child_bit.wire);
|
||||||
|
funct_declarations.push_back(stringf(" %s(&%s, %s(&%s));",
|
||||||
|
util_set_bit(child_bit.wire->width, child_bit.offset).c_str(),
|
||||||
|
(prefix + cid(child->hiername) + "." + cid(child_bit.wire->name)).c_str(),
|
||||||
|
util_get_bit(bit.wire->width, bit.offset).c_str(),
|
||||||
|
(prefix + cid(bit.wire->name)).c_str()));
|
||||||
|
child->set_dirty(child_bit);
|
||||||
|
} else {
|
||||||
|
work->set_dirty(std::get<0>(port));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
work->unset_dirty(bit);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!work->dirty_cells.empty())
|
||||||
|
{
|
||||||
|
Cell *cell = *work->dirty_cells.begin();
|
||||||
|
eval_cell(work, prefix, log_prefix, cell);
|
||||||
|
work->unset_dirty(cell);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
for (auto &child : work->children)
|
||||||
|
eval_dirty(child.second, prefix + cid(child.first) + ".", log_prefix + "." + cid(child.first), prefix);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void run(Module *mod)
|
||||||
|
{
|
||||||
|
create_module_struct(mod);
|
||||||
|
|
||||||
|
dirty_flags = new HierDirtyFlags(mod, IdString(), nullptr);
|
||||||
|
|
||||||
|
funct_declarations.push_back("");
|
||||||
|
funct_declarations.push_back(stringf("void %s_init(struct %s_state_t *state)", cid(mod->name).c_str(), cid(mod->name).c_str()));
|
||||||
|
funct_declarations.push_back("{");
|
||||||
|
funct_declarations.push_back("}");
|
||||||
|
|
||||||
|
funct_declarations.push_back("");
|
||||||
|
funct_declarations.push_back(stringf("void %s_eval(struct %s_state_t *state)", cid(mod->name).c_str(), cid(mod->name).c_str()));
|
||||||
|
funct_declarations.push_back("{");
|
||||||
|
|
||||||
|
for (Wire *w : mod->wires()) {
|
||||||
|
if (w->port_input)
|
||||||
|
for (SigBit bit : sigmaps.at(mod)(w))
|
||||||
|
dirty_flags->set_dirty(bit);
|
||||||
|
}
|
||||||
|
|
||||||
|
eval_dirty(dirty_flags, "state->", log_id(mod), "");
|
||||||
|
|
||||||
|
funct_declarations.push_back("}");
|
||||||
|
|
||||||
|
funct_declarations.push_back("");
|
||||||
|
funct_declarations.push_back(stringf("void %s_tick(struct %s_state_t *state)", cid(mod->name).c_str(), cid(mod->name).c_str()));
|
||||||
|
funct_declarations.push_back("{");
|
||||||
|
funct_declarations.push_back("}");
|
||||||
|
|
||||||
|
delete dirty_flags;
|
||||||
|
dirty_flags = nullptr;
|
||||||
|
}
|
||||||
|
|
||||||
|
void write(std::ostream &f)
|
||||||
|
{
|
||||||
|
f << "#include <stdint.h>" << std::endl;
|
||||||
|
f << "#include <stdbool.h>" << std::endl;
|
||||||
|
|
||||||
|
for (auto &line : signal_declarations)
|
||||||
|
f << line << std::endl;
|
||||||
|
|
||||||
|
for (auto &line : util_declarations)
|
||||||
|
f << line << std::endl;
|
||||||
|
|
||||||
|
for (auto &line : struct_declarations)
|
||||||
|
f << line << std::endl;
|
||||||
|
|
||||||
|
for (auto &line : funct_declarations)
|
||||||
|
f << line << std::endl;
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
struct SimplecBackend : public Backend {
|
||||||
|
SimplecBackend() : Backend("simplec", "convert design to simple C code") { }
|
||||||
|
virtual void help()
|
||||||
|
{
|
||||||
|
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
|
||||||
|
log("\n");
|
||||||
|
log(" write_simplec [options] [filename]\n");
|
||||||
|
log("\n");
|
||||||
|
log("Write simple C code for simulating the design. The C code writen can be used to\n");
|
||||||
|
log("simulate the design in a C environment, but the purpose of this command is to\n");
|
||||||
|
log("generate code that works well with C-based formal verification.\n");
|
||||||
|
log("\n");
|
||||||
|
log(" -verbose\n");
|
||||||
|
log(" this will print the recursive walk used to export the modules.\n");
|
||||||
|
log("\n");
|
||||||
|
log(" -i8, -i16, -i32, -i64\n");
|
||||||
|
log(" set the maximum integer bit width to use in the generated code.\n");
|
||||||
|
log("\n");
|
||||||
|
log("THIS COMMAND IS UNDER CONSTRUCTION\n");
|
||||||
|
log("\n");
|
||||||
|
}
|
||||||
|
virtual void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design)
|
||||||
|
{
|
||||||
|
SimplecWorker worker(design);
|
||||||
|
|
||||||
|
log_header(design, "Executing SIMPLEC backend.\n");
|
||||||
|
|
||||||
|
size_t argidx;
|
||||||
|
for (argidx = 1; argidx < args.size(); argidx++)
|
||||||
|
{
|
||||||
|
if (args[argidx] == "-verbose") {
|
||||||
|
worker.verbose = true;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
if (args[argidx] == "-i8") {
|
||||||
|
worker.max_uintsize = 8;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
if (args[argidx] == "-i16") {
|
||||||
|
worker.max_uintsize = 16;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
if (args[argidx] == "-i32") {
|
||||||
|
worker.max_uintsize = 32;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
if (args[argidx] == "-i64") {
|
||||||
|
worker.max_uintsize = 64;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
extra_args(f, filename, args, argidx);
|
||||||
|
|
||||||
|
Module *topmod = design->top_module();
|
||||||
|
|
||||||
|
if (topmod == nullptr)
|
||||||
|
log_error("Current design has no top module.\n");
|
||||||
|
|
||||||
|
worker.run(topmod);
|
||||||
|
worker.write(*f);
|
||||||
|
}
|
||||||
|
} SimplecBackend;
|
||||||
|
|
||||||
|
PRIVATE_NAMESPACE_END
|
|
@ -0,0 +1,5 @@
|
||||||
|
#!/bin/bash
|
||||||
|
set -ex
|
||||||
|
../../yosys -p 'synth -top test; write_simplec -i8 test00_uut.c' test00_uut.v
|
||||||
|
clang -o test00_tb test00_tb.c
|
||||||
|
./test00_tb
|
|
@ -0,0 +1,78 @@
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <assert.h>
|
||||||
|
#include "test00_uut.c"
|
||||||
|
|
||||||
|
uint32_t xorshift32()
|
||||||
|
{
|
||||||
|
static uint32_t x32 = 314159265;
|
||||||
|
x32 ^= x32 << 13;
|
||||||
|
x32 ^= x32 >> 17;
|
||||||
|
x32 ^= x32 << 5;
|
||||||
|
return x32;
|
||||||
|
}
|
||||||
|
|
||||||
|
int main()
|
||||||
|
{
|
||||||
|
struct test_state_t state;
|
||||||
|
uint32_t a, b, c, x, y, z;
|
||||||
|
|
||||||
|
for (int i = 0; i < 100; i++)
|
||||||
|
{
|
||||||
|
a = xorshift32();
|
||||||
|
b = xorshift32();
|
||||||
|
c = xorshift32();
|
||||||
|
|
||||||
|
x = (a & b) | c;
|
||||||
|
y = a & (b | c);
|
||||||
|
z = a ^ b ^ c;
|
||||||
|
|
||||||
|
state.a.value_7_0 = a;
|
||||||
|
state.a.value_15_8 = a >> 8;
|
||||||
|
state.a.value_23_16 = a >> 16;
|
||||||
|
state.a.value_31_24 = a >> 24;
|
||||||
|
|
||||||
|
state.b.value_7_0 = b;
|
||||||
|
state.b.value_15_8 = b >> 8;
|
||||||
|
state.b.value_23_16 = b >> 16;
|
||||||
|
state.b.value_31_24 = b >> 24;
|
||||||
|
|
||||||
|
state.c.value_7_0 = c;
|
||||||
|
state.c.value_15_8 = c >> 8;
|
||||||
|
state.c.value_23_16 = c >> 16;
|
||||||
|
state.c.value_31_24 = c >> 24;
|
||||||
|
|
||||||
|
test_eval(&state);
|
||||||
|
|
||||||
|
uint32_t uut_x = 0;
|
||||||
|
uut_x |= (uint32_t)state.x.value_7_0;
|
||||||
|
uut_x |= (uint32_t)state.x.value_15_8 << 8;
|
||||||
|
uut_x |= (uint32_t)state.x.value_23_16 << 16;
|
||||||
|
uut_x |= (uint32_t)state.x.value_31_24 << 24;
|
||||||
|
|
||||||
|
uint32_t uut_y = 0;
|
||||||
|
uut_y |= (uint32_t)state.y.value_7_0;
|
||||||
|
uut_y |= (uint32_t)state.y.value_15_8 << 8;
|
||||||
|
uut_y |= (uint32_t)state.y.value_23_16 << 16;
|
||||||
|
uut_y |= (uint32_t)state.y.value_31_24 << 24;
|
||||||
|
|
||||||
|
uint32_t uut_z = 0;
|
||||||
|
uut_z |= (uint32_t)state.z.value_7_0;
|
||||||
|
uut_z |= (uint32_t)state.z.value_15_8 << 8;
|
||||||
|
uut_z |= (uint32_t)state.z.value_23_16 << 16;
|
||||||
|
uut_z |= (uint32_t)state.z.value_31_24 << 24;
|
||||||
|
|
||||||
|
printf("---\n");
|
||||||
|
printf("A: 0x%08x\n", a);
|
||||||
|
printf("B: 0x%08x\n", b);
|
||||||
|
printf("C: 0x%08x\n", c);
|
||||||
|
printf("X: 0x%08x 0x%08x\n", x, uut_x);
|
||||||
|
printf("Y: 0x%08x 0x%08x\n", y, uut_y);
|
||||||
|
printf("Z: 0x%08x 0x%08x\n", z, uut_z);
|
||||||
|
|
||||||
|
assert(x == uut_x);
|
||||||
|
assert(y == uut_y);
|
||||||
|
assert(z == uut_z);
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
|
@ -0,0 +1,14 @@
|
||||||
|
module test(input [31:0] a, b, c, output [31:0] x, y, z);
|
||||||
|
unit_x unit_x_inst (.a(a), .b(b), .c(c), .x(x));
|
||||||
|
unit_y unit_y_inst (.a(a), .b(b), .c(c), .y(y));
|
||||||
|
assign z = a ^ b ^ c;
|
||||||
|
endmodule
|
||||||
|
|
||||||
|
module unit_x(input [31:0] a, b, c, output [31:0] x);
|
||||||
|
assign x = (a & b) | c;
|
||||||
|
endmodule
|
||||||
|
|
||||||
|
module unit_y(input [31:0] a, b, c, output [31:0] y);
|
||||||
|
assign y = a & (b | c);
|
||||||
|
endmodule
|
||||||
|
|
Loading…
Reference in New Issue