etc
/
uxn
mirror of https://git.sr.ht/~rabbits/uxn
0
1
Fork 0
Code Issues Projects Releases Wiki Activity

(uxn.c) Simpler switch argument

This commit is contained in:
neauoire 2023-11-01 19:14:31 -07:00
parent 5c79d2813a
commit d28f4f8165
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/uxn.c
View File

@ -41,16 +41,16 @@ uxn_eval(Uxn *u, Uint16 pc)
Uint8 *ram = u->ram, *rr;
if(!pc || u->dev[0x0f]) return 0;
for(;;) {
int ins = ram[pc++];
Uint8 ins = ram[pc++];
Stack *s = ins & 0x40 ? &u->rst : &u->wst;
switch(ins & 0x1f ? ins & 0x3f : ins << 4) {
switch(ins & 0x1f ? ins & 0x3f : ins) {
/* IMM */
case 0x000: /* BRK */ return 1;
case 0x200: /* JCI */ t=T; SHIFT(-1) if(!t) { pc += 2; break; } /* else fallthrough */
case 0x400: /* JMI */ rr = ram + pc; pc += PEEK2(rr) + 2; break;
case 0x600: /* JSI */ SHIFT( 2) T2_(pc + 2); rr = ram + pc; pc += PEEK2(rr) + 2; break;
case 0x800: /* LIT */ case 0xc00: SHIFT( 1) T = ram[pc++]; break;
case 0xa00: /* LIT2 */ case 0xe00: SHIFT( 2) N = ram[pc++]; T = ram[pc++]; break;
case 0x00: /* BRK */ return 1;
case 0x20: /* JCI */ t=T; SHIFT(-1) if(!t) { pc += 2; break; } /* else fallthrough */
case 0x40: /* JMI */ rr = ram + pc; pc += PEEK2(rr) + 2; break;
case 0x60: /* JSI */ SHIFT( 2) T2_(pc + 2); rr = ram + pc; pc += PEEK2(rr) + 2; break;
case 0x80: /* LIT */ case 0xc0: SHIFT( 1) T = ram[pc++]; break;
case 0xa0: /* LIT2 */ case 0xe0: SHIFT( 2) N = ram[pc++]; T = ram[pc++]; break;
/* ALU */
case 0x01: /* INC */ t=T; SET(1, 0) T = t + 1; break;
case 0x21: /* INC2 */ t=T2; SET(2, 0) T2_(t + 1) break;
@ -95,9 +95,9 @@ uxn_eval(Uxn *u, Uint16 pc)
case 0x15: /* STA */ t=T2;n=L; SET(3,-3) ram[t] = n; break;
case 0x35: /* STA2 */ t=T2;n=N2; SET(4,-4) ram[t++] = n >> 8; ram[t] = n; break;
case 0x16: /* DEI */ t=T; SET(1, 0) T = emu_dei(u, t); break;
case 0x36: /* DEI2 */ t=T; SET(1, 1) N = emu_dei(u, t); T = emu_dei(u, t + 1); break;
case 0x36: /* DEI2 */ t=T; SET(1, 1) N = emu_dei(u, t++); T = emu_dei(u, t); break;
case 0x17: /* DEO */ t=T;n=N; SET(2,-2) emu_deo(u, t, n); break;
case 0x37: /* DEO2 */ t=T;n=N;l=L; SET(3,-3) emu_deo(u, t, l); emu_deo(u, t + 1, n); break;
case 0x37: /* DEO2 */ t=T;n=N;l=L; SET(3,-3) emu_deo(u, t++, l); emu_deo(u, t, n); break;
case 0x18: /* ADD */ t=T;n=N; SET(2,-1) T = n + t; break;
case 0x38: /* ADD2 */ t=T2;n=N2; SET(4,-2) T2_(n + t) break;
case 0x19: /* SUB */ t=T;n=N; SET(2,-1) T = n - t; break;