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Handle statements in blocks overriding previous statement outputs.

This commit is contained in:
steve 2005-08-21 22:49:54 +00:00
parent c30cd9afea
commit 4644c220e8
1 changed files with 37 additions and 2 deletions
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39
synth2.cc
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@ -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 2004/10/04 01:10:55 steve Exp $"
#ident "$Id: synth2.cc,v 1.39.2.1 2005/08/21 22:49:54 steve Exp $"
#endif
# include "config.h"
@ -143,6 +143,11 @@ bool NetBlock::synth_async(Design*des, NetScope*scope,
const perm_string tmp1 = perm_string::literal("tmp1");
const perm_string tmp2 = perm_string::literal("tmp2");
const perm_string tmp3 = perm_string::literal("tmp3");
NetNet*accum_out = new NetNet(scope, tmp3, NetNet::WIRE,
nex_out->pin_count());
accum_out->local_flag(true);
bool flag = true;
NetProc*cur = last_;
@ -168,18 +173,42 @@ bool NetBlock::synth_async(Design*des, NetScope*scope,
if (ok_flag == false)
continue;
NetNet*new_accum = new NetNet(scope, tmp3, NetNet::WIRE,
nex_out->pin_count());
/* Use the nex_map to link up the output from the
substatement to the output of the block as a whole. */
for (unsigned idx = 0 ; idx < tmp_out->pin_count() ; idx += 1) {
unsigned ptr = find_nexus_in_set(nex_map, tmp_set[idx]);
connect(nex_out->pin(ptr), tmp_out->pin(idx));
connect(new_accum->pin(ptr), tmp_out->pin(idx));
}
delete tmp_map;
delete tmp_out;
/* Anything that is not redriven by the current
statement inherits the value that was driven from any
previous statements. */
for (unsigned idx = 0; idx < new_accum->pin_count(); idx += 1) {
if (new_accum->pin(idx).is_linked())
continue;
connect(new_accum->pin(idx), accum_out->pin(idx));
}
delete accum_out;
accum_out = new_accum;
} while (cur != last_);
/* Now bind the accumulated output valies to the nex_out
passed in. Note that each previous step has already did the
pin mapping, so just connect. */
for (unsigned idx = 0 ; idx < accum_out->pin_count() ; idx += 1) {
connect(nex_out->pin(idx), accum_out->pin(idx));
}
delete accum_out;
DEBUG_SYNTH2_EXIT("NetBlock",flag)
return flag;
}
@ -299,6 +328,9 @@ bool NetCase::synth_async(Design*des, NetScope*scope,
/* Missing case and no default; this could still be
* synthesizable with synchronous logic, but not here. */
DEBUG_SYNTH2_EXIT("NetCase", false)
cerr << get_line()
<< ": error: Incomplete case statement"
<< " is missing a default case." << endl;
return false;
}
statement_map[item]->synth_async(des, scope, nex_map, sig);
@ -985,6 +1017,9 @@ void synth2(Design*des)
/*
* $Log: synth2.cc,v $
* Revision 1.39.2.1 2005/08/21 22:49:54 steve
* Handle statements in blocks overriding previous statement outputs.
*
* Revision 1.39 2004/10/04 01:10:55 steve
* Clean up spurious trailing white space.
*