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cleanup

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This commit is contained in:
Michael Steil 2010-10-05 17:48:01 +00:00
parent 446774eaa3
commit 12e8208234
1 changed files with 30 additions and 35 deletions
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65
perfect6502.c
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@ -124,6 +124,12 @@ 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.
*/
static inline void
set_nodes_pullup(transnum_t t, BOOL state)
{
@ -289,11 +295,18 @@ static nodenum_t group[NODES];
static count_t groupcount;
DECLARE_BITMAP(groupbitmap, NODES);
BOOL group_contains_pullup;
BOOL group_contains_pulldown;
BOOL group_contains_hi;
static inline void
group_clear()
{
groupcount = 0;
bitmap_clear(groupbitmap, NODES);
group_contains_pullup = NO;
group_contains_pulldown = NO;
group_contains_hi = NO;
}
static inline void
@ -301,6 +314,13 @@ group_add(nodenum_t i)
{
group[groupcount++] = i;
set_bitmap(groupbitmap, i, 1);
if (get_nodes_pullup(i))
group_contains_pullup = YES;
if (get_nodes_pulldown(i))
group_contains_pulldown = YES;
if (get_nodes_state_value(i))
group_contains_hi = YES;
}
static inline nodenum_t
@ -398,14 +418,6 @@ typedef struct {
BOOL floating:1;
} state_t;
/*
* 1. if the group is connected to GND, it's 0
* 2. if the group is connected to VCC, it's 1
* 3. if there is a pullup node, it's 1
* 4. if there is a pulldown node, it's 0
* 5. otherwise, if there is an 1/floating node, it's 1/floating
* 6. otherwise, it's 0/floating
*/
static inline state_t
getNodeValue()
{
@ -415,20 +427,16 @@ getNodeValue()
if (group_contains(vcc))
return (state_t) { .value = 1, .floating = 0 };
BOOL contains_hi = NO;
if (group_contains_pulldown)
return (state_t) { .value = 0, .floating = 0 };
for (count_t i = 0; i < group_count(); i++) {
nodenum_t nn = group_get(i);
if (get_nodes_pullup(nn))
return (state_t) { .value = 1, .floating = 0 };
if (group_contains_pullup)
return (state_t) { .value = 1, .floating = 0 };
if (get_nodes_pulldown(nn))
return (state_t) { .value = 0, .floating = 0 };
if (get_nodes_state_value(nn))
contains_hi = YES;
}
return (state_t) { .value = contains_hi, .floating = 1 };
if (group_contains_hi)
return (state_t) { .value = 1, .floating = 1 };
else
return (state_t) { .value = 0, .floating = 1 };
}
void
@ -446,14 +454,6 @@ addRecalcNode(nodenum_t nn)
listout_add(nn);
}
void
floatnode(nodenum_t nn)
{
/* VCC and GND are constant */
if (nn != vss && nn != vcc)
set_nodes_state_floating(nn, 1);
}
#ifdef BROKEN_TRANSISTORS
transnum_t broken_transistor = (transnum_t)-1;
#endif
@ -479,8 +479,8 @@ toggleTransistor(transnum_t tn)
/* if the transistor is off, both nodes are floating */
if (!on) {
floatnode(transistors_c1[tn]);
floatnode(transistors_c2[tn]);
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 */
@ -870,11 +870,6 @@ setupNodesAndTransistors()
nodes_c1c2s[c1][nodes_c1c2count[c1]++] = i;
nodes_c1c2s[c2][nodes_c1c2count[c2]++] = i;
}
set_nodes_state_value(vss, 0);
set_nodes_state_floating(vss, 0);
set_nodes_state_value(vcc, 1);
set_nodes_state_floating(vcc, 0);
}
void