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(uxn.c) Simpler opc form

This commit is contained in:
neauoire 2023-08-29 09:47:53 -07:00
parent 71490d712c
commit 54b136bfea
1 changed files with 7 additions and 7 deletions
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14
src/uxn.c
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@ -42,14 +42,14 @@ uxn_eval(Uxn *u, Uint16 pc)
int k = ins & 0x80 ? 0xff : 0; int k = ins & 0x80 ? 0xff : 0;
Stack *s = ins & 0x40 ? &u->rst : &u->wst; Stack *s = ins & 0x40 ? &u->rst : &u->wst;
Uint8 *ptr = s->dat + s->ptr - 1; Uint8 *ptr = s->dat + s->ptr - 1;
switch(ins & 0x1f ? ins & 0x3f : (0 - (ins >> 5))) { switch(ins & 0x1f ? ins & 0x3f : ins << 4) {
/* IMM */ /* IMM */
case -0: /* BRK */ return 1; case 0x000: /* BRK */ return 1;
case -1: /* JCI */ if(!s->dat[--s->ptr]) { pc += 2; break; } /* else fallthrough */ case 0x200: /* JCI */ if(!s->dat[--s->ptr]) { pc += 2; break; } /* else fallthrough */
case -2: /* JMI */ pc += PEEK2(ram + pc) + 2; break; case 0x400: /* JMI */ pc += PEEK2(ram + pc) + 2; break;
case -3: /* JSI */ SET(0, 2) PUT2(pc + 2) pc += PEEK2(ram + pc) + 2; break; case 0x600: /* JSI */ SET(0, 2) PUT2(pc + 2) pc += PEEK2(ram + pc) + 2; break;
case -4: /* LITr */ case -6: SET(0, 1) PUT1(ram[pc++]) break; case 0x800: /* LIT */ case 0xc00: SET(0, 1) PUT1(ram[pc++]) break;
case -5: /* LIT2r*/ case -7: SET(0, 2) PUT2(PEEK2(ram + pc)) pc += 2; break; case 0xa00: /* LIT2 */ case 0xe00: SET(0, 2) PUT2(PEEK2(ram + pc)) pc += 2; break;
/* ALU */ /* ALU */
case 0x01: /* INC */ t=T; SET(1, 0) PUT1(t + 1) break; case 0x01: /* INC */ t=T; SET(1, 0) PUT1(t + 1) break;
case 0x21: /* INC2 */ t=T2; SET(2, 0) PUT2(t + 1) break; case 0x21: /* INC2 */ t=T2; SET(2, 0) PUT2(t + 1) break;