new version

div10 was prototyped with this program:

typedef unsigned char u8;
int main(void) {
	for (int i = 0; i <= 0x78; i++) {
		u8 real = i/10;
		u8 test = i;
		i++;

		test >>= 1;
		test += i;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += i;

		test >>= 1;
		test += i;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += 0;

		test >>= 1;
		test += 0;

		test >>= 1;
		i--;
		if (test != real)
			printf ("%hhd/10 == %hhd != %hhd\n", i, real, test);
	}
	return 0;
}

diff --git a/bsv.c b/bsv.c
index 8ce4b42801dc782fc48ddc419dccbf1b34507e4e..8bbde098019d84ea871c283435da22940106ee9b 100644 (file)
--- a/bsv.c
+++ b/bsv.c
@@ -95,9 +95,37 @@ void main(void){
                CALL    (g)
                SR      (acc)
                MOV     (tmp_1, acc) // acc saved in tmp_1; fresh acc
+               MOV     (acc, i2)
                // shift-divide by ten
                // note: i2 is max 0x78; so acc will <= 12.
-               acc = i2/10;//TODO
+                i2++;
+                acc >>= 1;
+                acc += i2;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += i2;
+
+                acc >>= 1;
+                acc += i2;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                acc += 0;
+
+                acc >>= 1;
+                i2--;
+
                // end divide by ten
                AND     (acc, tmp_1) // acc restored from tmp_1
                AND     (acc, 3)