commit 54b136b
neauoire
·
2023-08-29 16:47:53 +0000 UTC
parent 71490d7
(uxn.c) Simpler opc form
1 files changed,
+7,
-7
+7,
-7
1@@ -42,14 +42,14 @@ uxn_eval(Uxn *u, Uint16 pc)
2 int k = ins & 0x80 ? 0xff : 0;
3 Stack *s = ins & 0x40 ? &u->rst : &u->wst;
4 Uint8 *ptr = s->dat + s->ptr - 1;
5- switch(ins & 0x1f ? ins & 0x3f : (0 - (ins >> 5))) {
6+ switch(ins & 0x1f ? ins & 0x3f : ins << 4) {
7 /* IMM */
8- case -0: /* BRK */ return 1;
9- case -1: /* JCI */ if(!s->dat[--s->ptr]) { pc += 2; break; } /* else fallthrough */
10- case -2: /* JMI */ pc += PEEK2(ram + pc) + 2; break;
11- case -3: /* JSI */ SET(0, 2) PUT2(pc + 2) pc += PEEK2(ram + pc) + 2; break;
12- case -4: /* LITr */ case -6: SET(0, 1) PUT1(ram[pc++]) break;
13- case -5: /* LIT2r*/ case -7: SET(0, 2) PUT2(PEEK2(ram + pc)) pc += 2; break;
14+ case 0x000: /* BRK */ return 1;
15+ case 0x200: /* JCI */ if(!s->dat[--s->ptr]) { pc += 2; break; } /* else fallthrough */
16+ case 0x400: /* JMI */ pc += PEEK2(ram + pc) + 2; break;
17+ case 0x600: /* JSI */ SET(0, 2) PUT2(pc + 2) pc += PEEK2(ram + pc) + 2; break;
18+ case 0x800: /* LIT */ case 0xc00: SET(0, 1) PUT1(ram[pc++]) break;
19+ case 0xa00: /* LIT2 */ case 0xe00: SET(0, 2) PUT2(PEEK2(ram + pc)) pc += 2; break;
20 /* ALU */
21 case 0x01: /* INC */ t=T; SET(1, 0) PUT1(t + 1) break;
22 case 0x21: /* INC2 */ t=T2; SET(2, 0) PUT2(t + 1) break;