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Fix incorrect temporary size with padding 

Fix for pr2224949

The compiler generates a concatenation LPM to zero-pad ports when the
signal widths don't match up. However, when the VHDL generator generated
the input signals to this LPM it incorrectly sized them to be the width
of the result.
This commit is contained in:
Nick Gasson 2008-11-18 22:21:51 +00:00 committed by Stephen Williams
parent ec0e718151
commit 7529034c7a
1 changed files with 14 additions and 1 deletions
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15
tgt-vhdl/scope.cc
View File

@ -131,6 +131,7 @@ static string visible_nexus_signal_name(nexus_private_t *priv, vhdl_scope *scope
void draw_nexus(ivl_nexus_t nexus)
{
nexus_private_t *priv = new nexus_private_t;
int nexus_signal_width = -1;
priv->const_driver = NULL;
int nptrs = ivl_nexus_ptrs(nexus);
@ -144,6 +145,8 @@ void draw_nexus(ivl_nexus_t nexus)
vhdl_scope *scope = find_scope_for_signal(sig);
unsigned pin = ivl_nexus_ptr_pin(nexus_ptr);
link_scope_to_nexus_signal(priv, scope, sig, pin);
nexus_signal_width = ivl_signal_width(sig);
}
}
@ -188,7 +191,17 @@ void draw_nexus(ivl_nexus_t nexus)
else {
// Create a temporary signal to connect the nexus
// TODO: we could avoid this for IVL_LPM_PART_PV
vhdl_type *type = vhdl_type::type_for(ivl_lpm_width(lpm),
// If we already know how wide the temporary should be
// (i.e. because we've seen a signal it's connected to)
// then use that, otherwise use the width of the LPM
int lpm_temp_width;
if (nexus_signal_width != -1)
lpm_temp_width = nexus_signal_width;
else
lpm_temp_width = ivl_lpm_width(lpm);
vhdl_type *type = vhdl_type::type_for(lpm_temp_width,
ivl_lpm_signed(lpm) != 0);
ostringstream ss;
ss << "LPM" << ivl_lpm_basename(lpm);