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

(uxn.c) Less indirections in uxn core

This commit is contained in:
Devine Lu Linvega 2023-04-14 10:30:08 -07:00
parent 99874908e4
commit c7203de2ea
1 changed files with 23 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
src/uxn.c
View File

@ -39,25 +39,25 @@ WITH REGARD TO THIS SOFTWARE.
int
uxn_eval(Uxn *u, Uint16 pc)
{
Uint8 ins, opc, k;
Uint16 t, n, l, tmp;
int t, n, l, k, tmp, opc, ins;
Uint8 *ram = u->ram;
Stack *s, *z;
if(!pc || u->dev[0x0f]) return 0;
for(;;) {
ins = u->ram[pc++];
ins = ram[pc++] & 0xff;
k = !!(ins & 0x80);
s = ins & 0x40 ? &u->rst : &u->wst;
opc = !(ins & 0x1f) ? 0 - (ins >> 5) : ins & 0x3f;
opc = !(ins & 0x1f) ? (0 - (ins >> 5)) & 0xff : ins & 0x3f;
switch(opc) {
/* IMM */
case 0x00: /* BRK */ return 1;
case 0xff: /* JCI */ pc += !!s->dat[--s->ptr] * PEEK2(u->ram + pc) + 2; break;
case 0xfe: /* JMI */ pc += PEEK2(u->ram + pc) + 2; break;
case 0xfd: /* JSI */ PUSH2(&u->rst, pc + 2) pc += PEEK2(u->ram + pc) + 2; break;
case 0xfc: /* LIT */ PUSH(s, u->ram[pc++]) break;
case 0xfb: /* LIT2 */ PUSH2(s, PEEK2(u->ram + pc)) pc += 2; break;
case 0xfa: /* LITr */ PUSH(s, u->ram[pc++]) break;
case 0xf9: /* LIT2r */ PUSH2(s, PEEK2(u->ram + pc)) pc += 2; break;
case 0xff: /* JCI */ pc += !!s->dat[--s->ptr] * PEEK2(ram + pc) + 2; break;
case 0xfe: /* JMI */ pc += PEEK2(ram + pc) + 2; break;
case 0xfd: /* JSI */ PUSH2(&u->rst, pc + 2) pc += PEEK2(ram + pc) + 2; break;
case 0xfc: /* LIT */ PUSH(s, ram[pc++]) break;
case 0xfb: /* LIT2 */ PUSH2(s, PEEK2(ram + pc)) pc += 2; break;
case 0xfa: /* LITr */ PUSH(s, ram[pc++]) break;
case 0xf9: /* LIT2r */ PUSH2(s, PEEK2(ram + pc)) pc += 2; break;
/* ALU */
case 0x01: /* INC */ t=T; SET(1, 0) PUT(0, t + 1) break;
case 0x21: t=T2; SET(2, 0) PUT2(0, t + 1) break;
@ -89,18 +89,18 @@ uxn_eval(Uxn *u, Uint16 pc)
case 0x2e: t=T2; SET(2,-2) PUSH2(&u->rst, pc) pc = t; break;
case 0x0f: /* STH */ t=T; SET(1,-1) PUSH((ins & 0x40 ? &u->wst : &u->rst), t) break;
case 0x2f: t=T2; SET(2,-2) PUSH2((ins & 0x40 ? &u->wst : &u->rst), t) break;
case 0x10: /* LDZ */ t=T; SET(1, 0) PUT(0, u->ram[t]) break;
case 0x30: t=T; SET(1, 1) PUT2(0, PEEK2(u->ram + t)) break;
case 0x11: /* STZ */ t=T;n=N; SET(2,-2) u->ram[t] = n; break;
case 0x31: t=T;n=H2; SET(3,-3) POKE2(u->ram + t, n) break;
case 0x12: /* LDR */ t=T; SET(1, 0) PUT(0, u->ram[pc + (Sint8)t]) break;
case 0x32: t=T; SET(1, 1) PUT2(0, PEEK2(u->ram + pc + (Sint8)t)) break;
case 0x13: /* STR */ t=T;n=N; SET(2,-2) u->ram[pc + (Sint8)t] = n; break;
case 0x33: t=T;n=H2; SET(3,-3) POKE2(u->ram + pc + (Sint8)t, n) break;
case 0x14: /* LDA */ t=T2; SET(2,-1) PUT(0, u->ram[t]) break;
case 0x34: t=T2; SET(2, 0) PUT2(0, PEEK2(u->ram + t)) break;
case 0x15: /* STA */ t=T2;n=L; SET(3,-3) u->ram[t] = n; break;
case 0x35: t=T2;n=N2; SET(4,-4) POKE2(u->ram + t, n) break;
case 0x10: /* LDZ */ t=T; SET(1, 0) PUT(0, ram[t]) break;
case 0x30: t=T; SET(1, 1) PUT2(0, PEEK2(ram + t)) break;
case 0x11: /* STZ */ t=T;n=N; SET(2,-2) ram[t] = n; break;
case 0x31: t=T;n=H2; SET(3,-3) POKE2(ram + t, n) break;
case 0x12: /* LDR */ t=T; SET(1, 0) PUT(0, ram[pc + (Sint8)t]) break;
case 0x32: t=T; SET(1, 1) PUT2(0, PEEK2(ram + pc + (Sint8)t)) break;
case 0x13: /* STR */ t=T;n=N; SET(2,-2) ram[pc + (Sint8)t] = n; break;
case 0x33: t=T;n=H2; SET(3,-3) POKE2(ram + pc + (Sint8)t, n) break;
case 0x14: /* LDA */ t=T2; SET(2,-1) PUT(0, ram[t]) break;
case 0x34: t=T2; SET(2, 0) PUT2(0, PEEK2(ram + t)) break;
case 0x15: /* STA */ t=T2;n=L; SET(3,-3) ram[t] = n; break;
case 0x35: t=T2;n=N2; SET(4,-4) POKE2(ram + t, n) break;
case 0x16: /* DEI */ t=T; SET(1, 0) DEI(0, t) break;
case 0x36: t=T; SET(1, 1) DEI(1, t) DEI(0, t + 1) break;
case 0x17: /* DEO */ t=T;n=N; SET(2,-2) DEO(t, n) break;