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cpuz80.c
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/*
** Z80 assembler output routines for CVBasic
**
** by Oscar Toledo G.
**
** Creation date: Jul/31/2024. Separated from CVBasic.c
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "cvbasic.h"
#include "node.h"
static char z80_line[MAX_LINE_SIZE];
static char z80_line_1[MAX_LINE_SIZE];
static char z80_line_2[MAX_LINE_SIZE];
static char z80_line_3[MAX_LINE_SIZE];
static char z80_a_content[MAX_LINE_SIZE];
static char z80_hl_content[MAX_LINE_SIZE];
static int z80_flag_z_valid;
static void z80_emit_line(void);
void z80_emit_line(void)
{
int c;
int d;
/*
** Optimize the following cases:
** JP Z,cv1
** JP somewhere
** cv1:
**
** JP Z,cv1
** CALL somewhere
** cv1:
*/
if (memcmp(z80_line_2, "\tJP NZ," INTERNAL_PREFIX, 9) == 0 && isdigit(z80_line_2[9]) &&
(memcmp(z80_line_3, "\tJP ", 4) == 0 || memcmp(z80_line_3, "\tCALL ", 6) == 0) &&
memcmp(z80_line, INTERNAL_PREFIX, 2) == 0 && isdigit(z80_line[2]) &&
atoi(z80_line_2 + 9) == atoi(z80_line + 2)) {
if (z80_line_3[1] == 'J') {
strcpy(z80_line_2, "\tJP Z,");
strcat(z80_line_2, z80_line_3 + 4);
} else {
strcpy(z80_line_2, "\tCALL Z,");
strcat(z80_line_2, z80_line_3 + 6);
}
z80_line_3[0] = '\0';
z80_line[0] = '\0';
}
/*
** Optimize the following case:
** CALL cv1
** RET
*/
if (memcmp(z80_line_3, "\tCALL " INTERNAL_PREFIX, 8) == 0 && memcmp(z80_line, "\tRET\n", 5) == 0) {
strcpy(z80_line, "\tJP ");
strcat(z80_line, z80_line_3 + 6);
z80_line_3[0] = '\0';
}
if (z80_line_1[0])
fprintf(output, "%s", z80_line_1);
strcpy(z80_line_1, z80_line_2);
strcpy(z80_line_2, z80_line_3);
strcpy(z80_line_3, z80_line);
}
void cpuz80_dump(void)
{
if (z80_line_1[0])
fprintf(output, "%s", z80_line_1);
if (z80_line_2[0])
fprintf(output, "%s", z80_line_2);
if (z80_line_3[0])
fprintf(output, "%s", z80_line_3);
z80_line_1[0] = '\0';
z80_line_2[0] = '\0';
z80_line_3[0] = '\0';
}
/*
** Emit a Z80 label
*/
void cpuz80_label(char *label)
{
sprintf(z80_line, "%s:\n", label);
z80_emit_line();
z80_a_content[0] = '\0';
z80_hl_content[0] = '\0';
z80_flag_z_valid = 0;
}
/*
** Reset A register (technically a null label)
*/
void cpuz80_empty(void)
{
z80_a_content[0] = '\0';
z80_flag_z_valid = 0;
}
/*
** Emit a Z80 instruction with no operand
*/
void cpuz80_noop(char *mnemonic)
{
sprintf(z80_line, "\t%s\n", mnemonic);
z80_emit_line();
z80_a_content[0] = '\0';
if (strcmp(mnemonic, "NEG") == 0)
z80_flag_z_valid = 1;
else
z80_flag_z_valid = 0;
}
/*
** Emit a Z80 instruction with a single operand
*/
void cpuz80_1op(char *mnemonic, char *operand)
{
/*
** Optimize zero in register A
*/
if (strcmp(mnemonic, "SUB") == 0) {
if (strcmp(operand, "A") == 0) {
if (strcmp(z80_a_content, "0") == 0)
return;
}
}
/*
** Important note: AND A is used for the sole purpose of
** make sure A is zero.
**
** It is used OR A for clearing the carry flag for SBC HL,DE
*/
if (strcmp(mnemonic, "AND") == 0) {
if (strcmp(operand, "A") == 0) {
if (z80_flag_z_valid)
return;
}
}
sprintf(z80_line, "\t%s %s\n", mnemonic, operand);
z80_emit_line();
if (strcmp(mnemonic, "PUSH") == 0) {
/* No affected registers */
} else if (strcmp(mnemonic, "CP") == 0) {
/* No affected registers */
z80_flag_z_valid = 0;
} else if (strcmp(mnemonic, "POP") == 0) {
if (strcmp(operand, "AF") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 0;
} else if (strcmp(operand, "HL") == 0) {
z80_hl_content[0] = '\0';
}
} else if (strcmp(mnemonic, "CALL") == 0 ||
strcmp(mnemonic, "JP") == 0) {
z80_a_content[0] = '\0';
z80_hl_content[0] = '\0';
z80_flag_z_valid = 0;
} else if (strcmp(mnemonic, "SUB") == 0) {
if (strcmp(operand, "A") == 0)
strcpy(z80_a_content, "0");
else
z80_a_content[0] = '\0';
z80_flag_z_valid = 1;
} else if (strcmp(mnemonic, "OR") == 0 ||
strcmp(mnemonic, "XOR") == 0 ||
strcmp(mnemonic, "AND") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 1;
} else if (strcmp(mnemonic, "SRL") == 0) {
if (strcmp(operand, "H") == 0)
z80_hl_content[0] = '\0';
else if (strcmp(operand, "A") == 0)
z80_flag_z_valid = 1;
} else if (strcmp(mnemonic, "RR") == 0) {
if (strcmp(operand, "L") == 0)
z80_hl_content[0] = '\0';
z80_flag_z_valid = 0;
} else if (strcmp(mnemonic, "INC") == 0) {
if (strcmp(operand, "H") == 0 ||
strcmp(operand, "L") == 0 ||
strcmp(operand, "HL") == 0) {
z80_hl_content[0] = '\0';
z80_flag_z_valid = 0;
} else if (strcmp(operand, "A") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 1;
} else if (strcmp(operand, "(HL)") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 0;
}
} else if (strcmp(mnemonic, "DEC") == 0) {
if (strcmp(operand, "H") == 0 ||
strcmp(operand, "L") == 0 ||
strcmp(operand, "HL") == 0) {
z80_hl_content[0] = '\0';
z80_flag_z_valid = 0;
} else if (strcmp(operand, "A") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 1;
} else if (strcmp(operand, "(HL)") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 0;
}
} else if (strcmp(mnemonic, "DW") == 0 || strcmp(mnemonic, "ORG") == 0 || strcmp(mnemonic, "FORG") == 0) {
/* Nothing to do */
} else {
fprintf(stderr, "cpuz80_1op: not found mnemonic %s\n", mnemonic);
}
}
/*
** Emit a Z80 instruction with two operands
*/
void cpuz80_2op(char *mnemonic, char *operand1, char *operand2)
{
int special;
/*
** Optimize constant expressions (both constants and access to memory variables)
*/
special = 0;
if (strcmp(mnemonic, "LD") == 0) {
if (strcmp(operand1, "A") == 0) {
if (strcmp(operand2, z80_a_content) == 0)
return;
if (strcmp(operand2, z80_hl_content) == 0) {
operand2 = "L";
/* Reading from memory address, and HL already has the address */
} else if (operand2[0] == '(' && operand2[strlen(operand2) - 1] == ')' && memcmp(&operand2[1], z80_hl_content, strlen(operand2) - 2) == 0 && z80_hl_content[strlen(operand2) - 2] == '\0') {
/* Generate subexpression info and mark as previously processed */
z80_flag_z_valid = 0;
strcpy(z80_a_content, operand2);
special = 1; /* Mark as processed */
operand2 = "(HL)";
}
} else if (strcmp(operand1, "HL") == 0) {
if (strcmp(operand2, z80_hl_content) == 0)
return;
} else if (strcmp(operand2, "A") == 0) {
/* Writing to memory address, and HL already has the address */
if (operand1[0] == '(' && operand1[strlen(operand1) - 1] == ')' && memcmp(&operand1[1], z80_hl_content, strlen(operand1) - 2) == 0 && z80_hl_content[strlen(operand1) - 2] == '\0') {
/* Generate subexpression info and mark as previously processed */
strcpy(z80_a_content, operand1);
special = 1; /* Mark as processed */
operand1 = "(HL)";
}
}
}
sprintf(z80_line, "\t%s %s,%s\n", mnemonic, operand1, operand2);
z80_emit_line();
if (strcmp(mnemonic, "JP") == 0 ||
strcmp(mnemonic, "JR") == 0 ||
strcmp(mnemonic, "OUT") == 0 ||
strcmp(mnemonic, "RES") == 0 ||
strcmp(mnemonic, "SET") == 0) {
/* No affected registers or flags */
} else if (strcmp(mnemonic, "EX") == 0) {
z80_hl_content[0] = '\0';
} else if (strcmp(mnemonic, "IN") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 0;
} else if (strcmp(mnemonic, "ADD") == 0 || strcmp(mnemonic, "ADC") == 0 || strcmp(mnemonic, "SBC") == 0) {
if (strcmp(operand1, "A") == 0) {
z80_a_content[0] = '\0';
z80_flag_z_valid = 1;
} else {
z80_hl_content[0] = '\0';
z80_flag_z_valid = 0;
}
} else if (strcmp(mnemonic, "LD") == 0) {
if (special != 0)
return;
if (strcmp(operand1, "A") == 0) /* Read value into accumulator */
z80_flag_z_valid = 0; /* Z status isn't valid */
if (strcmp(operand1, "L") == 0 || strcmp(operand1, "H") == 0)
z80_hl_content[0] = '\0';
if (strcmp(operand1, "HL") == 0)
strcpy(z80_hl_content, operand2);
else if (strcmp(operand2, "HL") == 0)
strcpy(z80_hl_content, operand1);
if (strcmp(operand1, "A") == 0 && strcmp(operand2, "(HL)") == 0) {
z80_a_content[0] = '\0';
} else if (strcmp(operand1, "(HL)") == 0 && strcmp(operand2, "A") == 0) {
/* A keeps its value */
} else if (strcmp(operand1, "A") == 0) {
if (isdigit(operand2[0]) || operand2[0] == '(')
strcpy(z80_a_content, operand2);
else
z80_a_content[0] = '\0';
} else if (strcmp(operand2, "A") == 0 && operand1[0] == '(') {
strcpy(z80_a_content, operand1);
}
} else {
fprintf(stderr, "z80_2op: not found mnemonic %s\n", mnemonic);
}
}
/*
** Label register usage in tree
**
** This should match exactly register usage in cpuz80_node_generate.
*/
void cpuz80_node_label(struct node *node)
{
struct node *explore;
int c;
switch (node->type) {
case N_USR: /* Assembly language function with result */
explore = node->left;
while (explore != NULL) {
cpuz80_node_label(explore->left);
explore = explore->right;
}
node->regs = REG_ALL;
break;
case N_ADDR: /* Get address of variable */
case N_POS: /* Get screen cursor position */
case N_LOAD16: /* Load 16-bit value from address */
case N_NUM16: /* Load 16-bit constant */
case N_FRAME: /* Read current frame number */
node->regs = REG_HL;
break;
case N_NEG8: /* Negate 8-bit value */
case N_NOT8: /* Complement 8-bit value */
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
case N_NEG16: /* Negate 16-bit value */
case N_NOT16: /* Complement 16-bit value */
case N_ABS16: /* Get absolute 16-bit value */
case N_SGN16: /* Get sign of 16-bit value */
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_AF;
break;
case N_EXTEND8S: /* Extend 8-bit signed value to 16-bit */
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_HL;
break;
case N_EXTEND8: /* Extend 8-bit value to 16-bit */
if (node->left->type == N_LOAD8) { /* Reading 8-bit variable */
node->left->type = N_LOAD16;
cpuz80_node_label(node->left);
node->left->type = N_LOAD8;
node->regs = node->left->regs;
break;
}
if (node->left->type == N_PEEK8) { /* If reading 8-bit memory */
if (node->left->left->type == N_ADDR
|| ((node->left->left->type == N_PLUS16 || node->left->left->type == N_MINUS16) && node->left->left->left->type == N_ADDR && node->left->left->right->type == N_NUM16)) { /* Is it variable? */
node->left->type = N_PEEK16;
cpuz80_node_label(node->left);
node->left->type = N_PEEK8;
node->regs = node->left->regs;
break;
} else { /* Optimize to avoid LD A,(HL) / LD L,A */
cpuz80_node_label(node->left->left);
node->regs = node->left->left->regs;
break;
}
}
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_HL;
break;
case N_REDUCE16: /* Reduce 16-bit value to 8-bit */
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_A;
break;
case N_READ8: /* Read 8-bit value */
node->regs = REG_A | REG_HL;
break;
case N_READ16: /* Read 16-bit value */
node->regs = REG_A | REG_DE | REG_HL;
break;
case N_LOAD8: /* Load 8-bit value from address */
case N_JOY1: /* Read joystick 1 */
case N_JOY2: /* Read joystick 2 */
case N_KEY1: /* Read keypad 1 */
case N_KEY2: /* Read keypad 2 */
case N_MUSIC: /* Read music playing status */
case N_NTSC: /* Read NTSC flag */
case N_VDPSTATUS: /* Read VDP status */
node->regs = REG_A;
break;
case N_NUM8: /* Load 8-bit constant */
if (node->value == 0) {
node->regs = REG_AF;
} else {
node->regs = REG_A;
}
break;
case N_PEEK8: /* Load 8-bit content */
if (node->left->type == N_ADDR) { /* Optimize address */
node->regs = REG_A;
break;
}
if ((node->left->type == N_PLUS16 || node->left->type == N_MINUS16)
&& node->left->left->type == N_ADDR
&& node->left->right->type == N_NUM16) { /* Optimize address plus constant */
node->regs = REG_A;
break;
}
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_A;
break;
case N_PEEK16: /* Load 16-bit content */
if (node->left->type == N_ADDR) { /* Optimize address */
node->regs = REG_HL;
break;
}
if ((node->left->type == N_PLUS16 || node->left->type == N_MINUS16)
&& node->left->left->type == N_ADDR
&& node->left->right->type == N_NUM16) { /* Optimize address plus constant */
node->regs = REG_HL;
break;
}
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_AF;
break;
case N_VPEEK: /* Read VRAM */
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_AF;
break;
case N_INP: /* Read port */
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_C | REG_AF;
break;
case N_RANDOM: /* Read pseudorandom generator */
node->regs = REG_ALL;
break;
case N_OR8: /* 8-bit OR */
case N_XOR8: /* 8-bit XOR */
case N_AND8: /* 8-bit AND */
case N_EQUAL8: /* 8-bit = */
case N_NOTEQUAL8: /* 8-bit <> */
case N_LESS8: /* 8-bit < */
case N_LESSEQUAL8: /* 8-bit <= */
case N_GREATER8: /* 8-bit > */
case N_GREATEREQUAL8: /* 8-bit >= */
case N_PLUS8: /* 8-bit + */
case N_MINUS8: /* 8-bit - */
case N_MUL8: /* 8-bit * */
case N_DIV8: /* 8-bit / */
if (node->type == N_OR8 && node->left->type == N_JOY1 && node->right->type == N_JOY2) {
node->regs = REG_HL | REG_AF;
break;
}
if (node->type == N_AND8 && node->left->type == N_KEY1 && node->right->type == N_KEY2) {
node->regs = REG_HL | REG_AF;
break;
}
if (node->type == N_MUL8 && node->right->type == N_NUM8 && is_power_of_two(node->right->value)) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
c = node->right->value;
if (c > 1)
node->regs |= REG_F;
break;
}
if (node->type == N_DIV8 && node->right->type == N_NUM8 && is_power_of_two(node->right->value)) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
c = node->right->value;
if (c > 1)
node->regs |= REG_F;
break;
}
if (node->type == N_LESSEQUAL8 || node->type == N_GREATER8) {
if (node->left->type == N_NUM8) {
cpuz80_node_label(node->right);
node->regs = node->right->regs;
} else {
cpuz80_node_label(node->left);
cpuz80_node_label(node->right);
if (node->right->regs == REG_A) {
node->regs = REG_A | REG_B;
} else {
node->regs = node->left->regs | node->right->regs | REG_BC;
}
}
} else if (node->right->type == N_NUM8) {
c = node->right->value & 0xff;
cpuz80_node_label(node->left);
node->regs = node->left->regs;
} else {
cpuz80_node_label(node->right);
cpuz80_node_label(node->left);
if (node->left->regs == REG_A) {
node->regs = REG_A | REG_B;
} else {
node->regs = node->left->regs | node->right->regs | REG_BC;
}
}
break;
case N_ASSIGN8: /* 8-bit assignment */
if ((node->left->type == N_PLUS8 || node->left->type == N_MINUS8 || node->left->type == N_OR8 || node->left->type == N_AND8 || node->left->type == N_XOR8)
&& (node->left->right->type == N_NUM8 || node->left->right->type == N_LOAD8)
&& node_same_address(node->left->left, node->right)) {
if (node->right->type == N_ADDR) {
node->regs = REG_HL | REG_AF;
} else if (((node->right->type == N_PLUS16 || node->right->type == N_MINUS16) && node->right->left->type == N_ADDR && node->right->right->type == N_NUM16)) {
node->regs = REG_HL | REG_AF;
} else {
cpuz80_node_label(node->right);
node->regs = node->right->regs | REG_AF;
}
break;
}
if (node->right->type == N_ADDR) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
}
if ((node->right->type == N_PLUS16 || node->right->type == N_MINUS16) && node->right->left->type == N_ADDR && node->right->right->type == N_NUM16) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
}
cpuz80_node_label(node->right);
cpuz80_node_label(node->left);
if (node->left->type == N_NUM8) {
node->regs = node->right->regs;
} else {
node->regs = node->left->regs | node->right->regs;
}
break;
case N_ASSIGN16: /* 16-bit assignment */
if (node->right->type == N_ADDR) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
}
if ((node->right->type == N_PLUS16 || node->right->type == N_MINUS16) && node->right->left->type == N_ADDR && node->right->right->type == N_NUM16) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
}
cpuz80_node_label(node->right);
cpuz80_node_label(node->left);
node->regs = node->right->regs | node->left->regs | REG_DE | REG_A;
break;
default: /* Every other node, all remaining are 16-bit operations */
if (node->type == N_PLUS16 || node->type == N_MINUS16) {
if (node->left->type == N_ADDR) {
if (node->right->type == N_NUM16) {
node->regs = REG_HL;
break;
}
}
}
if (node->type == N_PLUS16) {
if (node->left->type == N_ADDR) {
cpuz80_node_label(node->right);
node->regs = node->right->regs | REG_DE;
break;
}
if (node->left->type == N_NUM16 || node->right->type == N_NUM16) {
if (node->left->type == N_NUM16)
explore = node->left;
else
explore = node->right;
c = explore->value;
if (c == 0 || c == 1 || c == 2 || c == 3 || c == 0xffff || c == 0xfffe || c == 0xfffd || c == 0xfc00 || c == 0xfd00 || c == 0xfe00 || c == 0xff00 || c == 0x0100 || c == 0x0200 || c == 0x0300 || c == 0x0400) {
if (node->left != explore) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
} else {
cpuz80_node_label(node->right);
node->regs = node->right->regs;
}
break;
}
}
}
if (node->type == N_MINUS16) {
if (node->right->type == N_ADDR) {
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_DE | REG_F;
break;
}
if (node->right->type == N_NUM16)
explore = node->right;
else
explore = NULL;
if (explore != NULL && (explore->value == 0 || explore->value == 1 || explore->value == 2 || explore->value == 3)) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
}
if (explore != NULL && (explore->value == 0xffff || explore->value == 0xfffe || explore->value == 0xfffd)) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
}
if (explore != NULL) {
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_DE | REG_F;
break;
}
}
if (node->type == N_OR16 || node->type == N_AND16 || node->type == N_XOR16) {
if (node->right->type == N_NUM16) {
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_AF;
break;
}
}
if (node->type == N_MUL16) {
if (node->left->type == N_NUM16)
explore = node->left;
else if (node->right->type == N_NUM16)
explore = node->right;
else
explore = NULL;
if (explore != NULL && (explore->value == 0 || explore->value == 1 || is_power_of_two(explore->value))) {
c = explore->value;
cpuz80_node_label(node->left);
cpuz80_node_label(node->right);
if (c == 0) {
node->regs = REG_HL;
} else {
node->regs = node->left->regs | node->right->regs;
}
break;
}
}
if (node->type == N_DIV16) {
if (node->right->type == N_NUM16 && (node->right->value == 2 || node->right->value == 4 || node->right->value == 8 || node->right->value == 16)) {
cpuz80_node_label(node->left);
if (node->right->value == 8 || node->right->value == 16)
node->regs = node->left->regs | REG_AF;
else
node->regs = node->left->regs;
break;
}
if (node->right->type == N_NUM16 && node->right->value == 256) {
cpuz80_node_label(node->left);
node->regs = node->left->regs;
break;
}
}
if (node->type == N_LESSEQUAL16 || node->type == N_GREATER16) {
if (node->left->type == N_NUM16) {
cpuz80_node_label(node->right);
node->regs = node->right->regs | REG_DE;
} else if (node->left->type == N_LOAD16) {
cpuz80_node_label(node->right);
node->regs = node->right->regs | REG_DE;
} else {
cpuz80_node_label(node->left);
cpuz80_node_label(node->right);
node->regs = node->left->regs | node->right->regs | REG_DE;
}
} else if ((node->type == N_EQUAL16 || node->type == N_NOTEQUAL16) && node->right->type == N_NUM16 && (node->right->value == 65535 || node->right->value == 0 || node->right->value == 1)) {
cpuz80_node_label(node->left);
node->regs = node->left->regs | REG_AF;
break;
} else {
cpuz80_node_label(node->right);
cpuz80_node_label(node->left);
node->regs = node->left->regs | node->right->regs | REG_DE;
}
if (node->type == N_OR16 || node->type == N_XOR16 || node->type == N_AND16 || node->type == N_EQUAL16 || node->type == N_NOTEQUAL16 || node->type == N_LESS16 || node->type == N_LESSEQUAL16 || node->type == N_GREATER16 || node->type == N_GREATEREQUAL16) {
node->regs |= REG_AF;
} else if (node->type == N_PLUS16 || node->type == N_MINUS16) {
node->regs |= REG_F;
} else if (node->type == N_MUL16 || node->type == N_DIV16 || node->type == N_MOD16 || node->type == N_DIV16S || node->type == N_MOD16S) {
node->regs |= REG_ALL;
}
break;
}
}
/*
** Generate code for tree
*/
void cpuz80_node_generate(struct node *node, int decision)
{
struct node *explore;
int c;
char *p;
switch (node->type) {
case N_USR: /* Assembly language function with result */
/* Generate arguments in reversed order */
for (c = node->value - 1; c >= 0; c--) {
int a;
a = c;
explore = node->left;
while (a) {
explore = explore->right;
a--;
}
cpuz80_node_generate(explore->left, 0);
if (c > 0)
cpuz80_1op("PUSH", "HL");
}
if (node->value > 1)
cpuz80_1op("POP", "DE");
if (node->value > 2)
cpuz80_1op("POP", "BC");
if (node->value > 3)
cpuz80_1op("POP", "IX");
if (node->value > 4)
cpuz80_1op("POP", "IY");
cpuz80_1op("CALL", node->label->name);
break;
case N_ADDR: /* Get address of variable */
node_get_label(node, 0);
cpuz80_2op("LD", "HL", temp);
break;
case N_NEG8: /* Negate 8-bit value */
cpuz80_node_generate(node->left, 0);
cpuz80_noop("NEG");
break;
case N_NOT8: /* Complement 8-bit value */
cpuz80_node_generate(node->left, 0);
cpuz80_noop("CPL");
break;
case N_NEG16: /* Negate 16-bit value */
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "A", "H");
cpuz80_noop("CPL");
cpuz80_2op("LD", "H", "A");
cpuz80_2op("LD", "A", "L");
cpuz80_noop("CPL");
cpuz80_2op("LD", "L", "A");
cpuz80_1op("INC", "HL");
break;
case N_NOT16: /* Complement 16-bit value */
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "A", "H");
cpuz80_noop("CPL");
cpuz80_2op("LD", "H", "A");
cpuz80_2op("LD", "A", "L");
cpuz80_noop("CPL");
cpuz80_2op("LD", "L", "A");
break;
case N_ABS16: /* Get absolute 16-bit value */
cpuz80_node_generate(node->left, 0);
cpuz80_1op("CALL", "_abs16");
break;
case N_SGN16: /* Get sign of 16-bit value */
cpuz80_node_generate(node->left, 0);
cpuz80_1op("CALL", "_sgn16");
break;
case N_POS: /* Get screen cursor position */
cpuz80_2op("LD", "HL", "(cursor)");
break;
case N_EXTEND8S: /* Extend 8-bit signed value to 16-bit */
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "L", "A");
cpuz80_noop("RLA");
cpuz80_2op("SBC", "A", "A");
cpuz80_2op("LD", "H", "A");
break;
case N_EXTEND8: /* Extend 8-bit value to 16-bit */
if (node->left->type == N_LOAD8) { /* Reading 8-bit variable */
node->left->type = N_LOAD16;
cpuz80_node_generate(node->left, 0);
node->left->type = N_LOAD8;
cpuz80_2op("LD", "H", "0");
break;
}
if (node->left->type == N_PEEK8) { /* If reading 8-bit memory */
if (node->left->left->type == N_ADDR
|| ((node->left->left->type == N_PLUS16 || node->left->left->type == N_MINUS16) && node->left->left->left->type == N_ADDR && node->left->left->right->type == N_NUM16)) { /* Is it variable? */
node->left->type = N_PEEK16;
cpuz80_node_generate(node->left, 0);
node->left->type = N_PEEK8;
cpuz80_2op("LD", "H", "0");
break;
} else { /* Optimize to avoid LD A,(HL) / LD L,A */
cpuz80_node_generate(node->left->left, 0);
cpuz80_2op("LD", "L", "(HL)");
cpuz80_2op("LD", "H", "0");
break;
}
}
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "L", "A");
cpuz80_2op("LD", "H", "0");
break;
case N_REDUCE16: /* Reduce 16-bit value to 8-bit */
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "A", "L");
break;
case N_READ8: /* Read 8-bit value */
cpuz80_2op("LD", "HL", "(read_pointer)");
cpuz80_2op("LD", "A", "(HL)");
cpuz80_1op("INC", "HL");
cpuz80_2op("LD", "(read_pointer)", "HL");
break;
case N_READ16: /* Read 16-bit value */
cpuz80_2op("LD", "HL", "(read_pointer)");
cpuz80_2op("LD", "E", "(HL)");
cpuz80_1op("INC", "HL");
cpuz80_2op("LD", "D", "(HL)");
cpuz80_1op("INC", "HL");
cpuz80_2op("LD", "(read_pointer)", "HL");
cpuz80_2op("EX", "DE", "HL");
break;
case N_LOAD8: /* Load 8-bit value from address */
strcpy(temp, "(" LABEL_PREFIX);
strcat(temp, node->label->name);
strcat(temp, ")");
cpuz80_2op("LD", "A", temp);
break;
case N_LOAD16: /* Load 16-bit value from address */
strcpy(temp, "(" LABEL_PREFIX);
strcat(temp, node->label->name);
strcat(temp, ")");
cpuz80_2op("LD", "HL", temp);
break;
case N_NUM8: /* Load 8-bit constant */
if (node->value == 0) {
cpuz80_1op("SUB", "A");
} else {
sprintf(temp, "%d", node->value);
cpuz80_2op("LD", "A", temp);
}
break;
case N_NUM16: /* Load 16-bit constant */
sprintf(temp, "%d", node->value);
cpuz80_2op("LD", "HL", temp);
break;
case N_PEEK8: /* Load 8-bit content */
if (node->left->type == N_ADDR) { /* Optimize address */
node_get_label(node->left, 1);
cpuz80_2op("LD", "A", temp);
break;
}
if ((node->left->type == N_PLUS16 || node->left->type == N_MINUS16)
&& node->left->left->type == N_ADDR
&& node->left->right->type == N_NUM16) { /* Optimize address plus constant */
node_get_label(node->left->left, 1);
p = temp;
while (*p)
p++;
p--; /* Eat right parenthesis */
if (node->left->type == N_PLUS16)
*p++ = '+';
else
*p++ = '-';
sprintf(p, "%d)", node->left->right->value);
cpuz80_2op("LD", "A", temp);
break;
}
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "A", "(HL)");
break;
case N_PEEK16: /* Load 16-bit content */
if (node->left->type == N_ADDR) { /* Optimize address */
node_get_label(node->left, 1);
cpuz80_2op("LD", "HL", temp);
break;
}
if ((node->left->type == N_PLUS16 || node->left->type == N_MINUS16)
&& node->left->left->type == N_ADDR
&& node->left->right->type == N_NUM16) { /* Optimize address plus constant */
node_get_label(node->left->left, 1);
p = temp;
while (*p)
p++;
p--; /* Eat right parenthesis */
if (node->left->type == N_PLUS16)
*p++ = '+';
else
*p++ = '-';
sprintf(p, "%d)", node->left->right->value);
cpuz80_2op("LD", "HL", temp);
break;
}
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "A", "(HL)");
cpuz80_1op("INC", "HL");
cpuz80_2op("LD", "H", "(HL)");
cpuz80_2op("LD", "L", "A");
break;
case N_VPEEK: /* Read VRAM */
cpuz80_node_generate(node->left, 0);
cpuz80_1op("CALL", "nmi_off");
cpuz80_1op("CALL", "RDVRM");
cpuz80_1op("CALL", "nmi_on");
break;
case N_INP: /* Read port */
cpuz80_node_generate(node->left, 0);
cpuz80_2op("LD", "C", "L");
cpuz80_2op("IN", "A", "(C)");
break;
case N_JOY1: /* Read joystick 1 */
cpuz80_2op("LD", "A", "(joy1_data)");
break;
case N_JOY2: /* Read joystick 2 */
cpuz80_2op("LD", "A", "(joy2_data)");
break;
case N_KEY1: /* Read keypad 1 */
cpuz80_2op("LD", "A", "(key1_data)");
break;
case N_KEY2: /* Read keypad 2 */
cpuz80_2op("LD", "A", "(key2_data)");
break;
case N_RANDOM: /* Read pseudorandom generator */
cpuz80_1op("CALL", "random");
break;
case N_FRAME: /* Read current frame number */
cpuz80_2op("LD", "HL", "(frame)");
break;
case N_MUSIC: /* Read music playing status */
cpuz80_2op("LD", "A", "(music_playing)");
break;
case N_NTSC: /* Read NTSC flag */
cpuz80_2op("LD", "A", "(ntsc)");
break;
case N_VDPSTATUS: /* Read VDP status */
cpuz80_2op("LD", "A", "(vdp_status)");
break;
case N_OR8: /* 8-bit OR */
case N_XOR8: /* 8-bit XOR */
case N_AND8: /* 8-bit AND */
case N_EQUAL8: /* 8-bit = */
case N_NOTEQUAL8: /* 8-bit <> */
case N_LESS8: /* 8-bit < */
case N_LESSEQUAL8: /* 8-bit <= */
case N_GREATER8: /* 8-bit > */
case N_GREATEREQUAL8: /* 8-bit >= */
case N_PLUS8: /* 8-bit + */
case N_MINUS8: /* 8-bit - */
case N_MUL8: /* 8-bit * */
case N_DIV8: /* 8-bit / */
if (node->type == N_OR8 && node->left->type == N_JOY1 && node->right->type == N_JOY2) {
cpuz80_2op("LD", "HL", "(joy1_data)");
cpuz80_2op("LD", "A", "H");
cpuz80_1op("OR", "L");
break;
}
if (node->type == N_AND8 && node->left->type == N_KEY1 && node->right->type == N_KEY2) {
cpuz80_2op("LD", "HL", "(key1_data)");
cpuz80_2op("LD", "A", "H");
cpuz80_1op("AND", "L");
break;
}
if (node->type == N_MUL8 && node->right->type == N_NUM8 && is_power_of_two(node->right->value)) {
cpuz80_node_generate(node->left, 0);
c = node->right->value;
while (c > 1) {
cpuz80_2op("ADD", "A", "A");
c /= 2;
}
break;
}
if (node->type == N_DIV8 && node->right->type == N_NUM8 && is_power_of_two(node->right->value)) {
cpuz80_node_generate(node->left, 0);
c = node->right->value;
if (c == 2) {
cpuz80_1op("SRL", "A");
} else if (c == 4) {
cpuz80_1op("SRL", "A");
cpuz80_1op("SRL", "A");
} else if (c == 8) {
cpuz80_noop("RRCA");
cpuz80_noop("RRCA");
cpuz80_noop("RRCA");
cpuz80_1op("AND", "31");
} else if (c == 16) {
cpuz80_noop("RRCA");
cpuz80_noop("RRCA");
cpuz80_noop("RRCA");
cpuz80_noop("RRCA");
cpuz80_1op("AND", "15");
} else if (c == 32) {
cpuz80_noop("RLCA");
cpuz80_noop("RLCA");
cpuz80_noop("RLCA");
cpuz80_1op("AND", "7");
} else if (c == 64) {
cpuz80_noop("RLCA");
cpuz80_noop("RLCA");
cpuz80_1op("AND", "3");
} else if (c == 128) {
cpuz80_noop("RLCA");
cpuz80_1op("AND", "1");
}
break;