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Give constants a driver 

This driver gives nets something to hang on to, and leads to
more sensible topology when multiple nets are driven by the
same constant.
This commit is contained in:
Stephen Williams 2009-09-26 09:59:06 -07:00
parent 91a16764e7
commit a3be083893
1 changed files with 18 additions and 3 deletions
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21
tgt-vvp/draw_net_input.c
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@ -422,6 +422,15 @@ static char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
fprintf(vvp_out, ", v%p_0;\n", sig);
}
snprintf(tmp, sizeof tmp, "L_%p", cptr);
result = strdup(tmp);
} else {
char tmp[64];
fprintf(vvp_out, "L_%p .functor BUFZ 1, %s, "
"C4<0>, C4<0>, C4<0>;\n", cptr, result);
free(result);
snprintf(tmp, sizeof tmp, "L_%p", cptr);
result = strdup(tmp);
}
@ -682,6 +691,13 @@ char* draw_net_input_x(ivl_nexus_t nex,
while (ndrivers) {
unsigned int inst;
for (inst = 0; inst < ndrivers; inst += 4) {
char*drive[4];
if (level == 0) {
for (idx = inst; idx < ndrivers && idx < inst+4; idx += 1) {
drive[idx-inst] = draw_net_input_drive(nex, drivers[idx]);
}
}
if (ndrivers > 4)
fprintf(vvp_out, "RS_%p/%d/%d .resolv tri",
nex, level, inst);
@ -694,9 +710,8 @@ char* draw_net_input_x(ivl_nexus_t nex,
fprintf(vvp_out, ", RS_%p/%d/%d",
nex, level - 1, idx*4);
} else {
char*drive = draw_net_input_drive(nex, drivers[idx]);
fprintf(vvp_out, ", %s", drive);
free(drive);
fprintf(vvp_out, ", %s", drive[idx-inst]);
free(drive[idx-inst]);
}
}
for ( ; idx < inst+4 ; idx += 1) {