uxn

commit f1f1babd47ad7a69d7419698e22daf45eeb9b8e6
parent bb99a02bf79d08be8d96e7e7dbd5653f22989607
Author: neauoire <aliceffekt@gmail.com>
Date:   Mon, 30 Oct 2023 09:29:40 -0700

(uxn.c) Removed used of stack pointer for circular arithmetic

Diffstat:
M
src/uxn.c
 | 
17
+++++++----------
M
src/uxnemu.c
 | 
2
+-

2 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/src/uxn.c b/src/uxn.c
@@ -17,12 +17,12 @@ WITH REGARD TO THIS SOFTWARE.
 [   L2   ][   N2   ][   T2   ] <
 */
 
-#define T *(ptr)
-#define N *(ptr - 1)
-#define L *(ptr - 2)
-#define X *(ptr - 3)
-#define Y *(ptr - 4)
-#define Z *(ptr - 5)
+#define T *(s->dat + s->ptr - 1)
+#define N *(s->dat + s->ptr - 2)
+#define L *(s->dat + s->ptr - 3)
+#define X *(s->dat + s->ptr - 4)
+#define Y *(s->dat + s->ptr - 5)
+#define Z *(s->dat + s->ptr - 6)
 #define T2 (N << 8 | T)
 #define H2 (L << 8 | N)
 #define N2 (X << 8 | L)
@@ -30,12 +30,10 @@ WITH REGARD TO THIS SOFTWARE.
 #define T2_(v) { r = (v); T = r; N = r >> 8; }
 #define N2_(v) { r = (v); L = r; X = r >> 8; }
 #define L2_(v) { r = (v); Y = r; Z = r >> 8; }
-
 #define DEI(p) (dei_masks[p] ? emu_dei(u, (p)) : u->dev[(p)])
 #define DEO(p, v) { u->dev[p] = v; if(deo_masks[p]) emu_deo(u, p); }
-
 #define FLIP      { s = ins & 0x40 ? &u->wst : &u->rst; }
-#define SHIFT(y)  { s->ptr += (y); ptr = s->dat + s->ptr - 1; }
+#define SHIFT(y)  { s->ptr += (y); }
 #define SET(x, y) { SHIFT((ins & 0x80) ? x + y : y) }
 
 int
@@ -47,7 +45,6 @@ uxn_eval(Uxn *u, Uint16 pc)
 	for(;;) {
 		int ins = ram[pc++];
 		Stack *s = ins & 0x40 ? &u->rst : &u->wst;
-		Uint8 *ptr = s->dat + s->ptr - 1;
 		switch(ins & 0x1f ? ins & 0x3f : ins << 4) {
 			/* IMM */
 			case 0x000: /* BRK  */                          return 1;
diff --git a/src/uxnemu.c b/src/uxnemu.c
@@ -561,7 +561,7 @@ main(int argc, char **argv)
 	/* Read flag. Right now, there can be only one. */
 	if(argv[i][0] == '-') {
 		if(argv[i][1] == 'v')
-			return system_version("Uxnemu - Graphical Varvara Emulator", "25 Oct 2023");
+			return system_version("Uxnemu - Graphical Varvara Emulator", "30 Oct 2023");
 		if(argv[i][1] == '-')
 			i++;
 		if(strcmp(argv[i], "-2x") == 0 || strcmp(argv[i], "-3x") == 0)