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Fix for br965. 

When performing constant propagation, we need to take into account
values driven through a tran object. For now, be pessimistic, and
assume that all tran objects connect to a variable driver.
This commit is contained in:
Martin Whitaker 2014-12-13 12:34:31 +00:00
parent 3ccc59eaa3
commit f29f4ff4e3
1 changed files with 9 additions and 1 deletions
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10
link_const.cc
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000-2013 Stephen Williams (steve@icarus.com)
* Copyright (c) 2000-2014 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
@ -45,6 +45,14 @@ bool Nexus::drivers_constant() const
return false;
}
/* If we are connected to a tran, there may be a driver
on the other side of the tran. We could try checking
for this, but for now, be pessimistic. */
if (dynamic_cast<const NetTran*>(cur->get_obj())) {
driven_ = VAR;
return false;
}
Link::DIR cur_dir = cur->get_dir();
if (cur_dir == Link::INPUT)
continue;