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don't track "floating" any more. much easier, same speed

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This commit is contained in:
Michael Steil 2010-10-05 17:54:51 +00:00
parent 12e8208234
commit 44ea268beb
1 changed files with 13 additions and 47 deletions
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60
perfect6502.c
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@ -118,16 +118,14 @@ get_bitmap(bitmap_t *bitmap, int index)
DECLARE_BITMAP(nodes_pullup, NODES);
DECLARE_BITMAP(nodes_pulldown, NODES);
DECLARE_BITMAP(nodes_state_value, NODES);
DECLARE_BITMAP(nodes_state_floating, NODES);
nodenum_t nodes_gates[NODES][NODES];
nodenum_t nodes_c1c2s[NODES][2*NODES];
count_t nodes_gatecount[NODES];
count_t nodes_c1c2count[NODES];
/*
* The "floating" and "value" properties of VCC and GND are
* never evaluated in the code, so we don't bother initializing
* them properly or special-casing writes to them.
* The "value" propertiy of VCC and GND is never evaluated in the code,
* so we don't bother initializing it properly or special-casing writes.
*/
static inline void
@ -166,18 +164,6 @@ get_nodes_state_value(transnum_t t)
return get_bitmap(nodes_state_value, t);
}
static inline void
set_nodes_state_floating(transnum_t t, BOOL state)
{
set_bitmap(nodes_state_floating, t, state);
}
static inline BOOL
get_nodes_state_floating(transnum_t t)
{
return get_bitmap(nodes_state_floating, t);
}
/************************************************************
*
* Data Structures and Algorithms for Transistors
@ -413,39 +399,30 @@ addNodeToGroup(nodenum_t i)
}
typedef struct {
BOOL value:1;
BOOL floating:1;
} state_t;
static inline state_t
static inline BOOL
getNodeValue()
{
if (group_contains(vss))
return (state_t) { .value = 0, .floating = 0 };
return NO;
if (group_contains(vcc))
return (state_t) { .value = 1, .floating = 0 };
return YES;
if (group_contains_pulldown)
return (state_t) { .value = 0, .floating = 0 };
return NO;
if (group_contains_pullup)
return (state_t) { .value = 1, .floating = 0 };
return YES;
if (group_contains_hi)
return (state_t) { .value = 1, .floating = 1 };
return YES;
else
return (state_t) { .value = 0, .floating = 1 };
return NO;
}
void
addRecalcNode(nodenum_t nn)
{
/* no need to analyze VCC or GND */
if (nn == vss || nn == vcc)
return;
/* we already know about this node */
if (listout_contains(nn))
return;
@ -477,12 +454,6 @@ toggleTransistor(transnum_t tn)
set_transistors_on(tn, on);
/* if the transistor is off, both nodes are floating */
if (!on) {
set_nodes_state_floating(transistors_c1[tn], 1);
set_nodes_state_floating(transistors_c2[tn], 1);
}
/* next time, we'll have to look at both nodes behind the transistor */
addRecalcNode(transistors_c1[tn]);
addRecalcNode(transistors_c2[tn]);
@ -491,9 +462,6 @@ toggleTransistor(transnum_t tn)
void
recalcNode(nodenum_t node)
{
if (node == vss || node == vcc)
return;
group_clear();
/*
@ -503,7 +471,7 @@ recalcNode(nodenum_t node)
addNodeToGroup(node);
/* get the state of the group */
state_t newv = getNodeValue();
BOOL newv = getNodeValue();
/*
* now all nodes in this group are in this state,
@ -514,9 +482,8 @@ recalcNode(nodenum_t node)
*/
for (count_t i = 0; i < group_count(); i++) {
nodenum_t nn = group_get(i);
BOOL needs_recalc = get_nodes_state_value(nn) != newv.value;
set_nodes_state_value(nn, newv.value);
set_nodes_state_floating(nn, newv.floating);
BOOL needs_recalc = get_nodes_state_value(nn) != newv;
set_nodes_state_value(nn, newv);
if (needs_recalc)
for (count_t t = 0; t < nodes_gatecount[nn]; t++)
toggleTransistor(nodes_gates[nn][t]);
@ -875,10 +842,9 @@ setupNodesAndTransistors()
void
resetChip()
{
/* all nodes are floating */
/* all nodes are down */
for (nodenum_t nn = 0; nn < NODES; nn++) {
set_nodes_state_value(nn, 0);
set_nodes_state_floating(nn, 1);
}
/* all transistors are off */
for (transnum_t tn = 0; tn < TRANSISTORS; tn++)