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Allow for implicit case default in synchronous processes.

This commit is contained in:
steve 2006-01-01 01:30:39 +00:00
parent 3131fa68b7
commit f28aa11936
1 changed files with 37 additions and 19 deletions
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56
synth2.cc
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2002-2003 Stephen Williams (steve@icarus.com)
* Copyright (c) 2002-2006 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
@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: synth2.cc,v 1.39.2.13 2005/12/31 04:28:15 steve Exp $"
#ident "$Id: synth2.cc,v 1.39.2.14 2006/01/01 01:30:39 steve Exp $"
#endif
# include "config.h"
@ -400,31 +400,46 @@ bool NetCase::synth_async(Design*des, NetScope*scope, bool sync_flag,
default_sig = sig;
}
if (statement_map[item] == 0) {
if (statement_map[item] == 0 && !sync_flag) {
/* Missing case and no default; this could still be
* synthesizable with synchronous logic, but not here. */
cerr << get_line()
<< ": error: Incomplete case statement"
<< " is missing a default case." << endl;
<< ": error: Incomplete case"
<< " in asynchronous process"
<< " needs a default case." << endl;
return_flag = false;
continue;
}
/* Synthesize this case. The synth_async will connect
all the output bits it knows how to the sig net. */
statement_map[item]->synth_async(des, scope, sync_flag,
nex_map, sig, accum);
if (statement_map[item] == 0) {
for (unsigned idx = 0 ; idx < mux->width() ; idx += 1) {
if (sig->pin(idx).is_linked())
connect(mux->pin_Data(idx, item), sig->pin(idx));
else if (accum->pin(idx).is_linked())
connect(mux->pin_Data(idx, item), accum->pin(idx));
else {
cerr << get_line()
<< ": error: case " << item << " statement "
<< " does not assign expected outputs." << endl;
return_flag = false;
/* If this is an unspecified case, then get the
input from the synchronous output. Note that we
know by design that there is no relevent
default or accum input to use here, as those
cases are handled above. */
for (unsigned idx=0; idx < mux->width(); idx += 1)
connect(mux->pin_Data(idx,item), nex_map->pin(idx));
} else {
/* Synthesize this specified case. The synth_async will
connect all the output bits it knows how to the
sig net. */
statement_map[item]->synth_async(des, scope, sync_flag,
nex_map, sig, accum);
for (unsigned idx = 0 ; idx < mux->width() ; idx += 1) {
if (sig->pin(idx).is_linked())
connect(mux->pin_Data(idx, item), sig->pin(idx));
else if (accum->pin(idx).is_linked())
connect(mux->pin_Data(idx, item), accum->pin(idx));
else {
cerr << get_line()
<< ": error: case " << item << " statement "
<< " does not assign expected outputs." << endl;
return_flag = false;
}
}
}
}
@ -1354,6 +1369,9 @@ void synth2(Design*des)
/*
* $Log: synth2.cc,v $
* Revision 1.39.2.14 2006/01/01 01:30:39 steve
* Allow for implicit case default in synchronous processes.
*
* Revision 1.39.2.13 2005/12/31 04:28:15 steve
* Fix crashes caused bu synthesis of sqrt32.v.
*