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t-dll.cc
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t-dll.cc
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/*
* Copyright (c) 2000 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: t-dll.cc,v 1.71 2001/12/06 03:11:00 steve Exp $"
#endif
# include "config.h"
# include <iostream>
# include "compiler.h"
# include "t-dll.h"
# include "netmisc.h"
#ifdef HAVE_MALLOC_H
# include <malloc.h>
#endif
# include <stdlib.h>
#if defined(__WIN32__)
inline ivl_dll_t ivl_dlopen(const char *name)
{
return (ivl_dll_t) LoadLibrary(name);
}
inline void * ivl_dlsym(ivl_dll_t dll, const char *nm)
{
FARPROC sym;
return GetProcAddress((HMODULE)dll, nm);
}
inline void ivl_dlclose(ivl_dll_t dll)
{
FreeLibrary((HMODULE)dll);
}
const char *dlerror(void)
{
static char msg[255];
FormatMessage(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &msg,
0,
NULL
);
return msg;
}
#elif defined(HAVE_DLFCN_H)
inline ivl_dll_t ivl_dlopen(const char*name)
{ return dlopen(name,RTLD_NOW); }
inline void* ivl_dlsym(ivl_dll_t dll, const char*nm)
{ return dlsym(dll, nm); }
inline void ivl_dlclose(ivl_dll_t dll)
{ dlclose(dll); }
#elif defined(HAVE_DL_H)
inline ivl_dll_t ivl_dlopen(const char*name)
{ return shl_load(name, BIND_IMMEDIATE, 0); }
inline void* ivl_dlsym(ivl_dll_t dll, const char*nm)
{
void*sym;
int rc = shl_findsym(&dll, nm, TYPE_PROCEDURE, &sym);
return (rc == 0) ? sym : 0;
}
inline void ivl_dlclose(ivl_dll_t dll)
{ shl_unload(dll); }
inline const char*dlerror(void)
{ return strerror( errno ); }
#endif
static struct dll_target dll_target_obj;
/*
* This function locates an ivl_scope_t object that matches the
* NetScope object. The search works by looking for the parent scope,
* then scanning the parent scope for the NetScope object.
*/
static ivl_scope_t find_scope_from_root(ivl_scope_t root, const NetScope*cur)
{
ivl_scope_t parent, tmp;
if (const NetScope*par = cur->parent()) {
parent = find_scope_from_root(root, par);
if (parent == 0)
return 0;
for (tmp = parent->child_ ; tmp ; tmp = tmp->sibling_)
if (strcmp(tmp->name_, cur->name().c_str()) == 0)
return tmp;
} else {
if (strcmp(root->name_, cur->name().c_str()) == 0)
return root;
}
return 0;
}
ivl_scope_t dll_target::find_scope(ivl_design_s &des, const NetScope*cur)
{
unsigned i;
ivl_scope_t scope = NULL;
for (i = 0; i < des.nroots_ && scope == NULL; i++)
scope = find_scope_from_root(des.roots_[i], cur);
return scope;
}
ivl_scope_t dll_target::lookup_scope_(const NetScope*cur)
{
return find_scope(des_, cur);
}
/*
* This is a convenience function to locate an ivl_signal_t object
* given the NetESignal that has the signal name.
*/
ivl_signal_t dll_target::find_signal(ivl_design_s &des, const NetNet*net)
{
ivl_scope_t scope = find_scope(des, net->scope());
assert(scope);
const char*nname = net->name();
for (unsigned idx = 0 ; idx < scope->nsigs_ ; idx += 1) {
if (strcmp(scope->sigs_[idx]->name_, nname) == 0)
return scope->sigs_[idx];
}
assert(0);
return 0;
}
/*
* This function locates an ivl_memory_t object that matches the
* NetMemory object. The search works by looking for the parent scope,
* then scanning the parent scope for the NetMemory object.
*/
static ivl_memory_t find_memory(ivl_scope_t root, const NetMemory*cur)
{
ivl_scope_t tmp;
ivl_memory_t mem ;
if (!root)
return 0;
for (unsigned i = 0; i < ivl_scope_mems(root); i++) {
mem = ivl_scope_mem(root, i);
if (!strcmp(ivl_memory_name(mem), cur->name().c_str()))
return mem;
}
mem = find_memory(root->child_, cur);
if (mem)
return mem;
mem = find_memory(root->sibling_, cur);
if (mem)
return mem;
return 0;
}
ivl_memory_t dll_target::lookup_memory_(const NetMemory*cur)
{
unsigned i;
ivl_memory_t mem = NULL;
for (i = 0; i < des_.nroots_ && mem == NULL; i++)
mem = find_memory(des_.roots_[i], cur);
return mem;
}
static ivl_nexus_t nexus_sig_make(ivl_signal_t net, unsigned pin)
{
ivl_nexus_t tmp = new struct ivl_nexus_s;
tmp->private_data = 0;
tmp->nptr_ = 1;
tmp->ptrs_ = (struct ivl_nexus_ptr_s*)
malloc(sizeof(struct ivl_nexus_ptr_s));
tmp->ptrs_[0].pin_ = pin;
tmp->ptrs_[0].type_ = __NEXUS_PTR_SIG;
tmp->ptrs_[0].l.sig = net;
ivl_drive_t drive = IVL_DR_HiZ;
switch (ivl_signal_type(net)) {
case IVL_SIT_REG:
drive = IVL_DR_STRONG;
break;
case IVL_SIT_SUPPLY0:
case IVL_SIT_SUPPLY1:
drive = IVL_DR_SUPPLY;
break;
}
tmp->ptrs_[0].drive0 = drive;
tmp->ptrs_[0].drive1 = drive;
return tmp;
}
static void nexus_sig_add(ivl_nexus_t nex, ivl_signal_t net, unsigned pin)
{
unsigned top = nex->nptr_ + 1;
nex->ptrs_ = (struct ivl_nexus_ptr_s*)
realloc(nex->ptrs_, top * sizeof(struct ivl_nexus_ptr_s));
nex->nptr_ = top;
ivl_drive_t drive = IVL_DR_HiZ;
switch (ivl_signal_type(net)) {
case IVL_SIT_REG:
drive = IVL_DR_STRONG;
break;
case IVL_SIT_SUPPLY0:
case IVL_SIT_SUPPLY1:
drive = IVL_DR_SUPPLY;
break;
}
nex->ptrs_[top-1].type_= __NEXUS_PTR_SIG;
nex->ptrs_[top-1].drive0 = drive;
nex->ptrs_[top-1].drive1 = drive;
nex->ptrs_[top-1].pin_ = pin;
nex->ptrs_[top-1].l.sig= net;
}
static void nexus_log_add(ivl_nexus_t nex, ivl_net_logic_t net, unsigned pin)
{
unsigned top = nex->nptr_ + 1;
nex->ptrs_ = (struct ivl_nexus_ptr_s*)
realloc(nex->ptrs_, top * sizeof(struct ivl_nexus_ptr_s));
nex->nptr_ = top;
nex->ptrs_[top-1].type_= __NEXUS_PTR_LOG;
nex->ptrs_[top-1].drive0 = (pin == 0)? IVL_DR_STRONG : IVL_DR_HiZ;
nex->ptrs_[top-1].drive1 = (pin == 0)? IVL_DR_STRONG : IVL_DR_HiZ;
nex->ptrs_[top-1].pin_ = pin;
nex->ptrs_[top-1].l.log= net;
}
static void nexus_con_add(ivl_nexus_t nex, ivl_net_const_t net, unsigned pin)
{
unsigned top = nex->nptr_ + 1;
nex->ptrs_ = (struct ivl_nexus_ptr_s*)
realloc(nex->ptrs_, top * sizeof(struct ivl_nexus_ptr_s));
nex->nptr_ = top;
nex->ptrs_[top-1].type_= __NEXUS_PTR_CON;
nex->ptrs_[top-1].drive0 = IVL_DR_STRONG;
nex->ptrs_[top-1].drive1 = IVL_DR_STRONG;
nex->ptrs_[top-1].pin_ = pin;
nex->ptrs_[top-1].l.con= net;
}
static void nexus_lpm_add(ivl_nexus_t nex, ivl_lpm_t net, unsigned pin,
ivl_drive_t drive0, ivl_drive_t drive1)
{
unsigned top = nex->nptr_ + 1;
nex->ptrs_ = (struct ivl_nexus_ptr_s*)
realloc(nex->ptrs_, top * sizeof(struct ivl_nexus_ptr_s));
nex->nptr_ = top;
nex->ptrs_[top-1].type_= __NEXUS_PTR_LPM;
nex->ptrs_[top-1].drive0 = drive0;
nex->ptrs_[top-1].drive1 = drive0;
nex->ptrs_[top-1].pin_ = pin;
nex->ptrs_[top-1].l.lpm= net;
}
void scope_add_logic(ivl_scope_t scope, ivl_net_logic_t net)
{
if (scope->nlog_ == 0) {
scope->nlog_ = 1;
scope->log_ = (ivl_net_logic_t*)malloc(sizeof(ivl_net_logic_t));
scope->log_[0] = net;
} else {
scope->nlog_ += 1;
scope->log_ = (ivl_net_logic_t*)
realloc(scope->log_, scope->nlog_*sizeof(ivl_net_logic_t));
scope->log_[scope->nlog_-1] = net;
}
}
void scope_add_event(ivl_scope_t scope, ivl_event_t net)
{
if (scope->nevent_ == 0) {
scope->nevent_ = 1;
scope->event_ = (ivl_event_t*)malloc(sizeof(ivl_event_t));
scope->event_[0] = net;
} else {
scope->nevent_ += 1;
scope->event_ = (ivl_event_t*)
realloc(scope->event_, scope->nevent_*sizeof(ivl_event_t));
scope->event_[scope->nevent_-1] = net;
}
}
static void scope_add_lpm(ivl_scope_t scope, ivl_lpm_t net)
{
if (scope->nlpm_ == 0) {
assert(scope->lpm_ == 0);
scope->nlpm_ = 1;
scope->lpm_ = (ivl_lpm_t*)malloc(sizeof(ivl_lpm_t));
scope->lpm_[0] = net;
} else {
assert(scope->lpm_);
scope->nlpm_ += 1;
scope->lpm_ = (ivl_lpm_t*)
realloc(scope->lpm_,
scope->nlpm_*sizeof(ivl_lpm_t));
scope->lpm_[scope->nlpm_-1] = net;
}
}
static void scope_add_mem(ivl_scope_t scope, ivl_memory_t net)
{
scope->nmem_ += 1;
scope->mem_ = (ivl_memory_t*)
realloc(scope->mem_, scope->nmem_*sizeof(ivl_memory_t));
scope->mem_[scope->nmem_-1] = net;
}
void dll_target::add_root(ivl_design_s &des_, const NetScope *s)
{
ivl_scope_t root_ = new struct ivl_scope_s;
const char *name = s->name().c_str();
root_->name_ = strdup(name);
root_->child_ = 0;
root_->sibling_ = 0;
root_->parent = 0;
root_->nsigs_ = 0;
root_->sigs_ = 0;
root_->nlog_ = 0;
root_->log_ = 0;
root_->nevent_ = 0;
root_->event_ = 0;
root_->nlpm_ = 0;
root_->lpm_ = 0;
root_->nmem_ = 0;
root_->mem_ = 0;
root_->type_ = IVL_SCT_MODULE;
root_->tname_ = root_->name_;
des_.nroots_++;
if (des_.roots_)
des_.roots_ = (ivl_scope_t *)realloc(des_.roots_, des_.nroots_ * sizeof(ivl_scope_t));
else
des_.roots_ = (ivl_scope_t *)malloc(des_.nroots_ * sizeof(ivl_scope_t));
des_.roots_[des_.nroots_ - 1] = root_;
}
bool dll_target::start_design(const Design*des)
{
list<NetScope *> root_scopes;
dll_path_ = des->get_flag("DLL");
dll_ = ivl_dlopen(dll_path_.c_str());
if (dll_ == 0) {
cerr << dll_path_ << ": " << dlerror() << endl;
return false;
}
stmt_cur_ = 0;
// Initialize the design object.
des_.self = des;
des_.time_precision = des->get_precision();
des_.nroots_ = 0;
des_.roots_ = NULL;
root_scopes = des->find_root_scopes();
for (list<NetScope*>::const_iterator scope = root_scopes.begin();
scope != root_scopes.end(); scope++)
add_root(des_, *scope);
des_.consts = (ivl_net_const_t*)
malloc(sizeof(ivl_net_const_t));
des_.nconsts = 0;
target_ = (target_design_f)ivl_dlsym(dll_, LU "target_design" TU);
if (target_ == 0) {
cerr << dll_path_ << ": error: target_design entry "
"point is missing." << endl;
return false;
}
return true;
}
/*
* Here ivl is telling us that the design is scanned completely, and
* here is where we call the API to process the constructed design.
*/
int dll_target::end_design(const Design*)
{
int rc = (target_)(&des_);
ivl_dlclose(dll_);
return rc;
}
static void logic_attributes(struct ivl_net_logic_s *obj,
const NetNode*net)
{
obj->nattr_ = net->nattr();
if (obj->nattr_ > 0) {
obj->akey_ = (char**)calloc(obj->nattr_, sizeof(char*));
obj->aval_ = (char**)calloc(obj->nattr_, sizeof(char*));
for (unsigned idx = 0 ; idx < obj->nattr_ ; idx += 1) {
obj->akey_[idx] = strdup(net->attr_key(idx));
obj->aval_[idx] = strdup(net->attr_value(idx));
}
} else {
obj->akey_ = 0;
obj->aval_ = 0;
}
}
/*
* Add a bufz object to the scope that contains it.
*
* Note that in the ivl_target API a BUFZ device is a special kind of
* ivl_net_logic_t device, so create an ivl_net_logic_t cookie to
* handle it.
*/
bool dll_target::bufz(const NetBUFZ*net)
{
struct ivl_net_logic_s *obj = new struct ivl_net_logic_s;
assert(net->pin_count() == 2);
obj->type_ = IVL_LO_BUFZ;
obj->npins_ = 2;
obj->pins_ = new ivl_nexus_t[2];
/* Get the ivl_nexus_t objects connected to the two pins.
(We know a priori that the ivl_nexus_t objects have been
allocated, because the signals have been scanned before
me. This saves me the trouble of allocating them.) */
assert(net->pin(0).nexus()->t_cookie());
obj->pins_[0] = (ivl_nexus_t) net->pin(0).nexus()->t_cookie();
nexus_log_add(obj->pins_[0], obj, 0);
assert(net->pin(1).nexus()->t_cookie());
obj->pins_[1] = (ivl_nexus_t) net->pin(1).nexus()->t_cookie();
nexus_log_add(obj->pins_[1], obj, 1);
/* Attach the logic device to the scope that contains it. */
assert(net->scope());
ivl_scope_t scope = find_scope(des_, net->scope());
assert(scope);
obj->scope_ = scope;
obj->name_ = strdup(net->name());
logic_attributes(obj, net);
scope_add_logic(scope, obj);
return true;
}
void dll_target::event(const NetEvent*net)
{
struct ivl_event_s *obj = new struct ivl_event_s;
ivl_scope_t scope = find_scope(des_, net->scope());
obj->name = strdup(net->full_name().c_str());
obj->scope = scope;
scope_add_event(scope, obj);
obj->nany = 0;
obj->nneg = 0;
obj->npos = 0;
if (net->nprobe() >= 1) {
for (unsigned idx = 0 ; idx < net->nprobe() ; idx += 1) {
const NetEvProbe*pr = net->probe(idx);
switch (pr->edge()) {
case NetEvProbe::ANYEDGE:
obj->nany += pr->pin_count();
break;
case NetEvProbe::NEGEDGE:
obj->nneg += pr->pin_count();
break;
case NetEvProbe::POSEDGE:
obj->npos += pr->pin_count();
break;
}
}
unsigned npins = obj->nany + obj->nneg + obj->npos;
obj->pins = (ivl_nexus_t*)calloc(npins, sizeof(ivl_nexus_t));
} else {
obj->pins = 0;
}
}
void dll_target::logic(const NetLogic*net)
{
struct ivl_net_logic_s *obj = new struct ivl_net_logic_s;
switch (net->type()) {
case NetLogic::AND:
obj->type_ = IVL_LO_AND;
break;
case NetLogic::BUF:
obj->type_ = IVL_LO_BUF;
break;
case NetLogic::BUFIF0:
obj->type_ = IVL_LO_BUFIF0;
break;
case NetLogic::BUFIF1:
obj->type_ = IVL_LO_BUFIF1;
break;
case NetLogic::NAND:
obj->type_ = IVL_LO_NAND;
break;
case NetLogic::NMOS:
obj->type_ = IVL_LO_NMOS;
break;
case NetLogic::NOR:
obj->type_ = IVL_LO_NOR;
break;
case NetLogic::NOT:
obj->type_ = IVL_LO_NOT;
break;
case NetLogic::NOTIF0:
obj->type_ = IVL_LO_NOTIF0;
break;
case NetLogic::NOTIF1:
obj->type_ = IVL_LO_NOTIF1;
break;
case NetLogic::OR:
obj->type_ = IVL_LO_OR;
break;
case NetLogic::PULLDOWN:
obj->type_ = IVL_LO_PULLDOWN;
break;
case NetLogic::PULLUP:
obj->type_ = IVL_LO_PULLUP;
break;
case NetLogic::RNMOS:
obj->type_ = IVL_LO_RNMOS;
break;
case NetLogic::RPMOS:
obj->type_ = IVL_LO_RPMOS;
break;
case NetLogic::PMOS:
obj->type_ = IVL_LO_PMOS;
break;
case NetLogic::XNOR:
obj->type_ = IVL_LO_XNOR;
break;
case NetLogic::XOR:
obj->type_ = IVL_LO_XOR;
break;
default:
assert(0);
obj->type_ = IVL_LO_NONE;
break;
}
/* Connect all the ivl_nexus_t objects to the pins of the
device. */
obj->npins_ = net->pin_count();
obj->pins_ = new ivl_nexus_t[obj->npins_];
for (unsigned idx = 0 ; idx < obj->npins_ ; idx += 1) {
const Nexus*nex = net->pin(idx).nexus();
assert(nex->t_cookie());
obj->pins_[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_log_add(obj->pins_[idx], obj, idx);
}
assert(net->scope());
ivl_scope_t scope = find_scope(des_, net->scope());
assert(scope);
obj->scope_= scope;
obj->name_ = strdup(net->name());
logic_attributes(obj, net);
obj->delay[0] = net->rise_time();
obj->delay[1] = net->fall_time();
obj->delay[2] = net->decay_time();
scope_add_logic(scope, obj);
}
void dll_target::net_case_cmp(const NetCaseCmp*net)
{
struct ivl_net_logic_s *obj = new struct ivl_net_logic_s;
obj->type_ = IVL_LO_EEQ;
/* Connect all the ivl_nexus_t objects to the pins of the
device. */
obj->npins_ = 3;
obj->pins_ = new ivl_nexus_t[obj->npins_];
for (unsigned idx = 0 ; idx < obj->npins_ ; idx += 1) {
const Nexus*nex = net->pin(idx).nexus();
assert(nex->t_cookie());
obj->pins_[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_log_add(obj->pins_[idx], obj, idx);
}
//assert(net->scope());
//ivl_scope_t scope = find_scope(des_, net->scope());
//assert(scope);
ivl_scope_t scope = des_.roots_[0];
obj->scope_= scope;
obj->name_ = strdup(net->name());
scope_add_logic(scope, obj);
}
bool dll_target::net_cassign(const NetCAssign*)
{
return false;
}
bool dll_target::net_force(const NetForce*net)
{
return true;
}
void dll_target::udp(const NetUDP*net)
{
struct ivl_net_logic_s *obj = new struct ivl_net_logic_s;
obj->type_ = IVL_LO_UDP;
static map<string,ivl_udp_t> udps;
ivl_udp_t u;
if (udps.find(net->udp_name()) != udps.end())
{
u = udps[net->udp_name()];
}
else
{
u = new struct ivl_udp_s;
u->nrows = net->rows();
u->table = (char**)malloc((u->nrows+1)*sizeof(char*));
assert(u->table);
u->table[u->nrows] = 0x0;
u->nin = net->nin();
u->sequ = net->is_sequential();
if (u->sequ)
u->init = net->get_initial();
u->name = strdup(net->udp_name().c_str());
string inp;
char out;
int i = 0;
if (net->first(inp, out))
do
{
string tt = inp+out;
u->table[i++] = strdup(tt.c_str());
} while (net->next(inp, out));
assert(i==u->nrows);
udps[net->udp_name()] = u;
}
obj->udp = u;
// Some duplication of code here, see: dll_target::logic()
/* Connect all the ivl_nexus_t objects to the pins of the
device. */
obj->npins_ = net->pin_count();
obj->pins_ = new ivl_nexus_t[obj->npins_];
for (unsigned idx = 0 ; idx < obj->npins_ ; idx += 1) {
const Nexus*nex = net->pin(idx).nexus();
assert(nex->t_cookie());
obj->pins_[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_log_add(obj->pins_[idx], obj, idx);
}
assert(net->scope());
ivl_scope_t scope = find_scope(des_, net->scope());
assert(scope);
obj->scope_= scope;
obj->name_ = strdup(net->name());
obj->delay[0] = net->rise_time();
obj->delay[1] = net->fall_time();
obj->delay[2] = net->decay_time();
scope_add_logic(scope, obj);
}
void dll_target::memory(const NetMemory*net)
{
ivl_memory_t obj = new struct ivl_memory_s;
obj->name_ = strdup(net->name().c_str());
obj->scope_ = find_scope(des_, net->scope());
obj->width_ = net->width();
obj->signed_ = 0;
obj->size_ = net->count();
obj->root_ = -net->index_to_address(0);
scope_add_mem(obj->scope_, obj);
}
void dll_target::lpm_add_sub(const NetAddSub*net)
{
ivl_lpm_t obj = new struct ivl_lpm_s;
if (net->attribute("LPM_Direction") == "SUB")
obj->type = IVL_LPM_SUB;
else
obj->type = IVL_LPM_ADD;
obj->name = strdup(net->name());
assert(net->scope());
obj->scope = find_scope(des_, net->scope());
assert(obj->scope);
/* Choose the width of the adder. If the carry bit is
connected, then widen the adder by one and plan on leaving
the fake inputs unconnected. */
obj->u_.arith.width = net->width();
if (net->pin_Cout().is_linked()) {
obj->u_.arith.width += 1;
}
obj->u_.arith.q = new ivl_nexus_t[3 * obj->u_.arith.width];
obj->u_.arith.a = obj->u_.arith.q + obj->u_.arith.width;
obj->u_.arith.b = obj->u_.arith.a + obj->u_.arith.width;
for (unsigned idx = 0 ; idx < net->width() ; idx += 1) {
const Nexus*nex;
nex = net->pin_Result(idx).nexus();
assert(nex->t_cookie());
obj->u_.arith.q[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[idx], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
nex = net->pin_DataA(idx).nexus();
assert(nex->t_cookie());
obj->u_.arith.a[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.a[idx], obj, 0,
IVL_DR_HiZ, IVL_DR_HiZ);
nex = net->pin_DataB(idx).nexus();
assert(nex->t_cookie());
obj->u_.arith.b[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.b[idx], obj, 0,
IVL_DR_HiZ, IVL_DR_HiZ);
}
/* If the carry output is connected, then connect the extra Q
pin to the carry nexus and zero the a and b inputs. */
if (net->pin_Cout().is_linked()) {
unsigned carry = obj->u_.arith.width - 1;
const Nexus*nex = net->pin_Cout().nexus();
assert(nex->t_cookie());
obj->u_.arith.q[carry] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[carry], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
obj->u_.arith.a[carry] = 0;
obj->u_.arith.b[carry] = 0;
}
scope_add_lpm(obj->scope, obj);
}
/*
* The lpm_clshift device represents both left and right shifts,
* depending on what is connected to the Direction pin. We convert
* this device into SHIFTL or SHIFTR devices.
*/
void dll_target::lpm_clshift(const NetCLShift*net)
{
ivl_lpm_t obj = new struct ivl_lpm_s;
obj->type = IVL_LPM_SHIFTL;
obj->name = strdup(net->name());
assert(net->scope());
obj->scope = find_scope(des_, net->scope());
assert(obj->scope);
/* Look at the direction input of the device, and select the
shift direction accordingly. */
if (net->pin_Direction().is_linked()) {
assert( link_drivers_constant(net->pin_Direction()) );
verinum::V dir = driven_value(net->pin_Direction());
switch (dir) {
case verinum::V0:
break;
case verinum::V1:
obj->type = IVL_LPM_SHIFTR;
break;
default:
assert(0);
}
}
obj->u_.shift.width = net->width();
obj->u_.shift.select = net->width_dist();
unsigned nex_count = obj->u_.shift.width * 2 + obj->u_.shift.select;
obj->u_.shift.q = new ivl_nexus_t[nex_count];
obj->u_.shift.d = obj->u_.shift.q + obj->u_.shift.width;
obj->u_.shift.s = obj->u_.shift.d + obj->u_.shift.width;
for (unsigned idx = 0 ; idx < nex_count ; idx += 1)
obj->u_.shift.q[idx] = 0;
for (unsigned idx = 0 ; idx < net->width() ; idx += 1) {
const Nexus*nex;
nex = net->pin_Result(idx).nexus();
assert(nex && nex->t_cookie());
obj->u_.shift.q[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.shift.q[idx], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
}
for (unsigned idx = 0 ; idx < net->width() ; idx += 1) {
const Nexus*nex;
nex = net->pin_Data(idx).nexus();
assert(nex && nex->t_cookie());
obj->u_.shift.d[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.shift.q[idx], obj, 0,
IVL_DR_HiZ, IVL_DR_HiZ);
}
for (unsigned idx = 0 ; idx < net->width_dist() ; idx += 1) {
const Nexus*nex;
nex = net->pin_Distance(idx).nexus();
assert(nex && nex->t_cookie());
obj->u_.shift.s[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.shift.s[idx], obj, 0,
IVL_DR_HiZ, IVL_DR_HiZ);
}
scope_add_lpm(obj->scope, obj);
}
/*
* Make out of the NetCompare object an ivl_lpm_s object. The
* comparators in ivl_target do not support < or <=, but they can be
* trivially converted to > and >= by swapping the operands.
*/
void dll_target::lpm_compare(const NetCompare*net)
{
ivl_lpm_t obj = new struct ivl_lpm_s;
obj->name = strdup(net->name());
assert(net->scope());
obj->scope = find_scope(des_, net->scope());
assert(obj->scope);
bool swap_operands = false;
obj->u_.arith.width = net->width();
obj->u_.arith.q = new ivl_nexus_t[1 + 2 * obj->u_.arith.width];
obj->u_.arith.a = obj->u_.arith.q + 1;
obj->u_.arith.b = obj->u_.arith.a + obj->u_.arith.width;
if (net->pin_AGEB().is_linked()) {
const Nexus*nex = net->pin_AGEB().nexus();
obj->type = IVL_LPM_CMP_GE;
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
} else if (net->pin_AGB().is_linked()) {
const Nexus*nex = net->pin_AGB().nexus();
obj->type = IVL_LPM_CMP_GT;
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
} else if (net->pin_ALEB().is_linked()) {
const Nexus*nex = net->pin_ALEB().nexus();
obj->type = IVL_LPM_CMP_GE;
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
swap_operands = true;
} else if (net->pin_ALB().is_linked()) {
const Nexus*nex = net->pin_ALB().nexus();
obj->type = IVL_LPM_CMP_GT;
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
swap_operands = true;
} else if (net->pin_AEB().is_linked()) {
const Nexus*nex = net->pin_AEB().nexus();
obj->type = IVL_LPM_CMP_EQ;
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
} else if (net->pin_ANEB().is_linked()) {
const Nexus*nex = net->pin_ANEB().nexus();
obj->type = IVL_LPM_CMP_NE;
if (! nex->t_cookie()) {
cerr << "internal error: COMPARE_NE device " <<
net->name()<<" ANEB pin nexus has no cookie."<<endl;
assert(0);
}
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
} else {
assert(0);
}
for (unsigned idx = 0 ; idx < net->width() ; idx += 1) {
const Nexus*nex;
nex = swap_operands
? net->pin_DataB(idx).nexus()
: net->pin_DataA(idx).nexus();
assert(nex->t_cookie());
obj->u_.arith.a[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.a[idx], obj, 0,
IVL_DR_HiZ, IVL_DR_HiZ);
nex = swap_operands
? net->pin_DataA(idx).nexus()
: net->pin_DataB(idx).nexus();
assert(nex->t_cookie());
obj->u_.arith.b[idx] = (ivl_nexus_t) nex->t_cookie();