svpdyn: initial buggy iram caching

git-svn-id: file:///home/notaz/opt/svn/PicoDrive@356 be3aeb3a-fb24-0410-a615-afba39da0efa

tools/bselect.c

@@ -0,0 +1,156 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+static unsigned char *ptr[100];
+static int ptrc;
+
+#define M 256
+
+static struct 
+{
+	int pos;
+	int cnt;
+} max[M];
+
+
+static int active[100];
+static int activec;
+
+static int active_pos;
+
+static void
+fill_max(void)
+{
+	int i, n, b, c, u;
+
+
+	memset(max, 0, sizeof(max));
+
+	for (b = 0; b < 0x800; b++)
+	{
+		c = 0;
+		for (i = 0; i < activec; i++)
+		{
+			for (u = i + 1; u < activec; u++)
+			{
+				if (ptr[active[i]][b] == ptr[active[u]][b])
+				{
+					goto bad;
+				}
+			}
+			c ++;
+bad:;
+		}
+
+		for (i = 0; i < M; i ++)
+		{
+			if (max[i].cnt < c)
+			{
+				max[i].pos = b;
+				max[i].cnt = c;
+				break;
+			}
+		}
+	}
+}
+
+static void
+select_max(void)
+{
+	int i, m, c;
+
+	m = max[0].cnt;
+
+	if (max[0].cnt == 1)
+	{
+		printf("no solution!\n");
+		exit(1);
+	}
+	c = 0;
+	for (i = 0; i < M; i++)
+	{
+		if (m == max[i].cnt)
+		{
+			c++;
+		}
+	}
+
+	i = random() % c;
+	active_pos = max[i].pos;
+	printf("0x%03X (%d) ", active_pos, max[i].cnt);
+}
+
+
+static void
+search_active(void)
+{
+	int i, j, a;
+	int tmpa[100];
+
+
+	a = 0;
+	for (i = 0; i < activec; i++)
+	{
+		for (j = 0; j < activec; j++)
+		{
+			if (i == j)
+			{
+				continue;
+			}
+			if (ptr[active[i]][active_pos] ==
+				ptr[active[j]][active_pos])
+			{
+				tmpa[a] = active[i];
+				a++;
+				break;
+			}
+		}
+	}
+
+	printf("(%d) ", a);
+	for (i = 0; i < activec; i++)
+	{
+		printf("%02X ", ptr[active[i]][active_pos]);
+	}
+
+	printf("\n");
+
+	memcpy(active, tmpa, sizeof(active));
+	activec = a;
+}
+
+int
+main(int argc, char *argv[])
+{
+	int i, u, b, c;
+	FILE *f;
+
+
+	srandom(time(NULL));
+
+	ptrc = argc - 1;
+
+	/*
+	 * read data
+	 */
+
+	for (i = 0; i < ptrc; i++)
+	{
+		ptr[i] = malloc(0x800);
+		f = fopen(argv[i + 1], "rb");
+		fread(ptr[i], 1, 0x800, f);
+		fclose(f);
+		active[i] = i;
+	}
+	activec = ptrc;
+
+	while (activec > 0)
+	{
+		fill_max();
+		select_max();
+		search_active();
+	}
+
+	return 0;
+}
+