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Initial support for NetCondit synth_async.

This commit is contained in:
Stephen Williams 2013-08-11 19:10:50 -07:00
parent 947d642da7
commit 687d0a928b
1 changed files with 23 additions and 33 deletions
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56
synth2.cc
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@ -24,7 +24,7 @@
# include "netvector.h"
# include "netmisc.h"
# include "compiler.h"
# include <cassert>
# include "ivl_assert.h"
bool NetProc::synth_async(Design*, NetScope*, const NetBus&, NetBus&)
@ -237,69 +237,59 @@ bool NetCase::synth_async(Design*des, NetScope*scope,
return true;
}
bool NetCondit::synth_async(Design*des, NetScope* /*scope*/,
const NetBus& /*nex_map*/, NetBus& /*nex_out*/)
bool NetCondit::synth_async(Design*des, NetScope*scope,
const NetBus&nex_map, NetBus&nex_out)
{
cerr << get_fileline() << ": sorry: "
<< "Forgot to implement NetCondit::synth_async" << endl;
des->errors += 1;
return false;
#if 0
NetNet*ssig = expr_->synthesize(des);
assert(ssig);
if (if_ == 0) {
DEBUG_SYNTH2_EXIT("NetCondit",false)
return false;
}
if (else_ == 0) {
cerr << get_line() << ": error: Asynchronous if statement"
cerr << get_fileline() << ": error: Asynchronous if statement"
<< " is missing the else clause." << endl;
DEBUG_SYNTH2_EXIT("NetCondit",false)
return false;
}
assert(if_ != 0);
assert(else_ != 0);
NetNet*asig = new NetNet(scope, scope->local_symbol(),
NetNet::WIRE, nex_map->pin_count());
asig->local_flag(true);
// Synthesize the condition. This will act as a select signal
// for a binary mux.
NetNet*ssig = expr_->synthesize(des, scope, expr_);
assert(ssig);
// Calculate the vector width of the result.
unsigned mux_width = 0;
for (unsigned idx = 0 ; idx < nex_out.pin_count() ; idx += 1)
mux_width += nex_out.pin(idx).nexus()->vector_width();
bool flag;
NetBus asig(scope, 1);
flag = if_->synth_async(des, scope, nex_map, asig);
if (!flag) {
delete asig;
DEBUG_SYNTH2_EXIT("NetCondit",false)
return false;
}
NetNet*bsig = new NetNet(scope, scope->local_symbol(),
NetNet::WIRE, nex_map->pin_count());
bsig->local_flag(true);
NetBus bsig(scope, 1);
flag = else_->synth_async(des, scope, nex_map, bsig);
if (!flag) {
delete asig;
delete bsig;
DEBUG_SYNTH2_EXIT("NetCondit",false)
return false;
}
NetMux*mux = new NetMux(scope, scope->local_symbol(),
nex_out->vector_width(), 2, 1);
mux_width, 2, 1);
connect(mux->pin_Sel(), ssig->pin(0));
connect(mux->pin_Data(1), asig->pin(0));
connect(mux->pin_Data(0), bsig->pin(0));
connect(nex_out->pin(0), mux->pin_Result());
connect(mux->pin_Data(1), asig.pin(0));
connect(mux->pin_Data(0), bsig.pin(0));
// For now, only support nex_out with 1 item.
ivl_assert(*this, nex_out.pin_count()==1);
connect(nex_out.pin(0), mux->pin_Result());
des->add_node(mux);
DEBUG_SYNTH2_EXIT("NetCondit",true)
return true;
#endif
}
bool NetEvWait::synth_async(Design*des, NetScope*scope,