80486DX2-66/86Box-fork
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Optimize IO in

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Around 36% faster
This commit is contained in:
Adrien Moulin
2022-08-09 19:14:42 +02:00
parent 2a6a061556
commit 26d6b308a9
3 changed files with 48 additions and 32 deletions
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2
src/include/86box/m_amstrad.h
View File

@@ -20,7 +20,7 @@
#ifndef MACHINE_AMSTRAD_H
#define MACHINE_AMSTRAD_H
extern int amstrad_latch;
extern uint32_t amstrad_latch;
enum {
AMSTRAD_NOLATCH,

73
src/io.c
View File

@@ -312,12 +312,14 @@ inb(uint16_t port)
p = q;
}
if (port & 0x80)
amstrad_latch = AMSTRAD_NOLATCH;
else if (port & 0x4000)
amstrad_latch = AMSTRAD_SW10;
else
amstrad_latch = AMSTRAD_SW9;
if (amstrad_latch & 0x80000000) {
if (port & 0x80)
amstrad_latch = AMSTRAD_NOLATCH | 0x80000000;
else if (port & 0x4000)
amstrad_latch = AMSTRAD_SW10 | 0x80000000;
else
amstrad_latch = AMSTRAD_SW9 | 0x80000000;
}
if (!found)
cycles -= io_delay;
@@ -401,12 +403,14 @@ inw(uint16_t port)
}
ret = (ret8[1] << 8) | ret8[0];
if (port & 0x80)
amstrad_latch = AMSTRAD_NOLATCH;
else if (port & 0x4000)
amstrad_latch = AMSTRAD_SW10;
else
amstrad_latch = AMSTRAD_SW9;
if (amstrad_latch & 0x80000000) {
if (port & 0x80)
amstrad_latch = AMSTRAD_NOLATCH | 0x80000000;
else if (port & 0x4000)
amstrad_latch = AMSTRAD_SW10 | 0x80000000;
else
amstrad_latch = AMSTRAD_SW9 | 0x80000000;
}
if (!found)
cycles -= io_delay;
@@ -487,17 +491,26 @@ inl(uint16_t port)
ret16[0] = ret & 0xffff;
ret16[1] = (ret >> 16) & 0xffff;
for (i = 0; i < 4; i += 2) {
p = io[(port + i) & 0xffff];
while(p) {
q = p->next;
if (p->inw && !p->inl) {
ret16[i >> 1] &= p->inw(port + i, p->priv);
found |= 2;
qfound++;
}
p = q;
}
p = io[port & 0xffff];
while (p) {
q = p->next;
if (p->inw && !p->inl) {
ret16[0] &= p->inw(port, p->priv);
found |= 2;
qfound++;
}
p = q;
}
p = io[(port + 2) & 0xffff];
while (p) {
q = p->next;
if (p->inw && !p->inl) {
ret16[1] &= p->inw(port + 2, p->priv);
found |= 2;
qfound++;
}
p = q;
}
ret = (ret16[1] << 16) | ret16[0];
@@ -519,12 +532,14 @@ inl(uint16_t port)
}
ret = (ret8[3] << 24) | (ret8[2] << 16) | (ret8[1] << 8) | ret8[0];
if (port & 0x80)
amstrad_latch = AMSTRAD_NOLATCH;
else if (port & 0x4000)
amstrad_latch = AMSTRAD_SW10;
else
amstrad_latch = AMSTRAD_SW9;
if (amstrad_latch & 0x80000000) {
if (port & 0x80)
amstrad_latch = AMSTRAD_NOLATCH | 0x80000000;
else if (port & 0x4000)
amstrad_latch = AMSTRAD_SW10 | 0x80000000;
else
amstrad_latch = AMSTRAD_SW9 | 0x80000000;
}
if (!found)
cycles -= io_delay;

5
src/machine/m_amstrad.c
View File

@@ -156,7 +156,7 @@ typedef struct {
fdc_t *fdc;
} amstrad_t;
int amstrad_latch;
uint32_t amstrad_latch;
static uint8_t key_queue[16];
static int key_queue_start = 0,
@@ -2255,7 +2255,7 @@ ams_read(uint16_t port, void *priv)
else if (video_is_mda())
ret |= 0xc0;
switch (amstrad_latch) {
switch (amstrad_latch & 0x7fffffff) {
case AMSTRAD_NOLATCH:
ret &= ~0x20;
break;
@@ -2293,6 +2293,7 @@ machine_amstrad_init(const machine_t *model, int type)
ams = (amstrad_t *) malloc(sizeof(amstrad_t));
memset(ams, 0x00, sizeof(amstrad_t));
ams->type = type;
amstrad_latch = 0x80000000;
switch (type) {
case AMS_PC200: