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(uxnmin) Dispatch table

This commit is contained in:
Devine Lu Linvega 2024-02-19 09:43:38 -08:00
parent ac0a5720fd
commit 95dfc3fa90
1 changed files with 46 additions and 42 deletions
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88
ref/uxnmin.c
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@ -43,20 +43,26 @@ emu_deo(Uxn *u, Uint8 addr, Uint8 value)
#define POKE(x, y, r) { if(m2) { r = (x); ram[r++] = y >> 8; ram[r] = y; } else ram[(x)] = (y); } #define POKE(x, y, r) { if(m2) { r = (x); ram[r++] = y >> 8; ram[r] = y; } else ram[(x)] = (y); }
#define DEVR(o, p) { if(m2) { o = (emu_dei(u, p) << 8) | emu_dei(u, p + 1); } else o = emu_dei(u, p); } #define DEVR(o, p) { if(m2) { o = (emu_dei(u, p) << 8) | emu_dei(u, p + 1); } else o = emu_dei(u, p); }
#define DEVW(p, y) { if(m2) { emu_deo(u, p, y >> 8); emu_deo(u, p + 1, y); } else emu_deo(u, p, y); } #define DEVW(p, y) { if(m2) { emu_deo(u, p, y >> 8); emu_deo(u, p + 1, y); } else emu_deo(u, p, y); }
#define next { ins = ram[pc++]; \
m2 = ins & 0x20; \
s = ins & 0x40 ? &u->rst : &u->wst; \
if(ins & 0x80) kp = s->ptr, sp = &kp; else sp = &s->ptr; \
goto *lut[ins & 0x1f]; }
int int
uxn_eval(Uxn *u, Uint16 pc) uxn_eval(Uxn *u, Uint16 pc)
{ {
Uint8 t, kp, *sp, *ram = u->ram; Uint8 t, kp, *sp, ins, m2, *ram = u->ram;
Uint16 tt, a, b, c; Uint16 tt, a, b, c;
Stack *s;
static void* lut[] = {
&&_imm, &&_inc, &&_pop, &&_nip, &&_swp, &&_rot, &&_dup, &&_ovr,
&&_equ, &&_neq, &&_gth, &&_lth, &&_jmp, &&_jcn, &&_jsr, &&_sth,
&&_ldz, &&_stz, &&_ldr, &&_str, &&_lda, &&_sta, &&_dei, &&_deo,
&&_add, &&_sub, &&_mul, &&_div, &&_and, &&_ora, &&_eor, &&_sft };
if(!pc || u->dev[0x0f]) return 0; if(!pc || u->dev[0x0f]) return 0;
for(;;) { next
Uint8 ins = ram[pc++]; _imm:
/* 2 */ Uint8 m2 = ins & 0x20;
/* r */ Stack *s = ins & 0x40 ? &u->rst : &u->wst;
/* k */ if(ins & 0x80) kp = s->ptr, sp = &kp; else sp = &s->ptr;
switch(ins & 0x1f) {
case 0x00:
switch(ins) { switch(ins) {
case 0x00: /* BRK */ return 1; case 0x00: /* BRK */ return 1;
case 0x20: /* JCI */ POP1(b) if(!b) { pc += 2; break; } case 0x20: /* JCI */ POP1(b) if(!b) { pc += 2; break; }
@ -64,40 +70,38 @@ uxn_eval(Uxn *u, Uint16 pc)
case 0x60: /* JSI */ PUSH2(pc + 2) a = ram[pc++] << 8 | ram[pc++]; pc += a; break; case 0x60: /* JSI */ PUSH2(pc + 2) a = ram[pc++] << 8 | ram[pc++]; pc += a; break;
case 0x80: case 0xc0: /* LIT */ PUSH1(ram[pc++]) break; case 0x80: case 0xc0: /* LIT */ PUSH1(ram[pc++]) break;
case 0xa0: case 0xe0: /* LIT2 */ PUSH1(ram[pc++]) PUSH1(ram[pc++]) break; case 0xa0: case 0xe0: /* LIT2 */ PUSH1(ram[pc++]) PUSH1(ram[pc++]) break;
} break; } next
case 0x01: /* INC */ POPx(a) PUSHx(a + 1) break; _inc: POPx(a) PUSHx(a + 1) next
case 0x02: /* POP */ POPx(a) break; _pop: POPx(a) next
case 0x03: /* NIP */ POPx(a) POPx(b) PUSHx(a) break; _nip: POPx(a) POPx(b) PUSHx(a) next
case 0x04: /* SWP */ POPx(a) POPx(b) PUSHx(a) PUSHx(b) break; _swp: POPx(a) POPx(b) PUSHx(a) PUSHx(b) next
case 0x05: /* ROT */ POPx(a) POPx(b) POPx(c) PUSHx(b) PUSHx(a) PUSHx(c) break; _rot: POPx(a) POPx(b) POPx(c) PUSHx(b) PUSHx(a) PUSHx(c) next
case 0x06: /* DUP */ POPx(a) PUSHx(a) PUSHx(a) break; _dup: POPx(a) PUSHx(a) PUSHx(a) next
case 0x07: /* OVR */ POPx(a) POPx(b) PUSHx(b) PUSHx(a) PUSHx(b) break; _ovr: POPx(a) POPx(b) PUSHx(b) PUSHx(a) PUSHx(b) next
case 0x08: /* EQU */ POPx(a) POPx(b) PUSH1(b == a) break; _equ: POPx(a) POPx(b) PUSH1(b == a) next
case 0x09: /* NEQ */ POPx(a) POPx(b) PUSH1(b != a) break; _neq: POPx(a) POPx(b) PUSH1(b != a) next
case 0x0a: /* GTH */ POPx(a) POPx(b) PUSH1(b > a) break; _gth: POPx(a) POPx(b) PUSH1(b > a) next
case 0x0b: /* LTH */ POPx(a) POPx(b) PUSH1(b < a) break; _lth: POPx(a) POPx(b) PUSH1(b < a) next
case 0x0c: /* JMP */ POPx(a) JUMP(a) break; _jmp: POPx(a) JUMP(a) next
case 0x0d: /* JCN */ POPx(a) POP1(b) if(b) JUMP(a) break; _jcn: POPx(a) POP1(b) if(b) JUMP(a) next
case 0x0e: /* JSR */ POPx(a) FLIP PUSH2(pc) JUMP(a) break; _jsr: POPx(a) FLIP PUSH2(pc) JUMP(a) next
case 0x0f: /* STH */ POPx(a) FLIP PUSHx(a) break; _sth: POPx(a) FLIP PUSHx(a) next
case 0x10: /* LDZ */ POP1(a) PEEK(b, a, t) PUSHx(b) break; _ldz: POP1(a) PEEK(b, a, t) PUSHx(b) next
case 0x11: /* STZ */ POP1(a) POPx(b) POKE(a, b, t) break; _stz: POP1(a) POPx(b) POKE(a, b, t) next
case 0x12: /* LDR */ POP1(a) PEEK(b, pc + (Sint8)a, tt) PUSHx(b) break; _ldr: POP1(a) PEEK(b, pc + (Sint8)a, tt) PUSHx(b) next
case 0x13: /* STR */ POP1(a) POPx(b) POKE(pc + (Sint8)a, b, tt) break; _str: POP1(a) POPx(b) POKE(pc + (Sint8)a, b, tt) next
case 0x14: /* LDA */ POP2(a) PEEK(b, a, tt) PUSHx(b) break; _lda: POP2(a) PEEK(b, a, tt) PUSHx(b) next
case 0x15: /* STA */ POP2(a) POPx(b) POKE(a, b, tt) break; _sta: POP2(a) POPx(b) POKE(a, b, tt) next
case 0x16: /* DEI */ POP1(a) DEVR(b, a) PUSHx(b) break; _dei: POP1(a) DEVR(b, a) PUSHx(b) next
case 0x17: /* DEO */ POP1(a) POPx(b) DEVW(a, b) break; _deo: POP1(a) POPx(b) DEVW(a, b) next
case 0x18: /* ADD */ POPx(a) POPx(b) PUSHx(b + a) break; _add: POPx(a) POPx(b) PUSHx(b + a) next
case 0x19: /* SUB */ POPx(a) POPx(b) PUSHx(b - a) break; _sub: POPx(a) POPx(b) PUSHx(b - a) next
case 0x1a: /* MUL */ POPx(a) POPx(b) PUSHx(b * a) break; _mul: POPx(a) POPx(b) PUSHx(b * a) next
case 0x1b: /* DIV */ POPx(a) POPx(b) PUSHx(a ? b / a : 0) break; _div: POPx(a) POPx(b) PUSHx(a ? b / a : 0) next
case 0x1c: /* AND */ POPx(a) POPx(b) PUSHx(b & a) break; _and: POPx(a) POPx(b) PUSHx(b & a) next
case 0x1d: /* ORA */ POPx(a) POPx(b) PUSHx(b | a) break; _ora: POPx(a) POPx(b) PUSHx(b | a) next
case 0x1e: /* EOR */ POPx(a) POPx(b) PUSHx(b ^ a) break; _eor: POPx(a) POPx(b) PUSHx(b ^ a) next
case 0x1f: /* SFT */ POP1(a) POPx(b) PUSHx(b >> (a & 0xf) << (a >> 4)) break; _sft: POP1(a) POPx(b) PUSHx(b >> (a & 0xf) << (a >> 4)) next
}
}
} }
void void