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Diffstat (limited to 'trunk/src/emu/cpu/z8000/makedab.c')
-rw-r--r--trunk/src/emu/cpu/z8000/makedab.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/trunk/src/emu/cpu/z8000/makedab.c b/trunk/src/emu/cpu/z8000/makedab.c
new file mode 100644
index 00000000000..e9ec0fe91c6
--- /dev/null
+++ b/trunk/src/emu/cpu/z8000/makedab.c
@@ -0,0 +1,87 @@
+#include <stdio.h>
+
+#define CF 0x100
+#define HF 0x200
+#define DF 0x400
+
+int dab[0x800];
+
+int main(int ac, char **av)
+{
+ int i;
+
+ for (i = 0; i < DF; i++) {
+ if (i & CF) {
+ if (i & 0x0f < 0x0a)
+ dab[i] = CF | ((i + 0x60) & 0xff);
+ else
+ dab[i] = CF | ((i + 0x66) & 0xff);
+ } else {
+ if (i & HF) {
+ if (i & 0xf0 < 0xa0)
+ dab[i] = ((i + 0x06) & 0xff);
+ else
+ dab[i] = CF | ((i + 0x66) & 0xff);
+ } else {
+ if ((i & 0xf0) < 0xa0 && (i & 0x0f) < 0x0a)
+ dab[i] = i & 0xff;
+ else if ((i & 0xf0) < 0x90 && (i & 0x0f) >= 0x0a)
+ dab[i] = ((i + 0x06) & 0xff);
+ else if ((i & 0xf0) >= 0xa0 && (i & 0x0f) < 0x0a)
+ dab[i] = CF | ((i + 0x60) & 0xff);
+ else if ((i & 0xf0) >= 0x90 && (i & 0x0f) >= 0x0a)
+ dab[i] = CF | ((i + 0x66) & 0xff);
+ else {
+ fprintf(stderr, "unhandled $%04x\n", i);
+ return 1;
+ }
+
+ }
+ }
+
+ if (i & CF) {
+ if (i & HF) {
+ dab[DF+i] = CF | ((i + 0x9a) & 0xff);
+ } else {
+ dab[DF+i] = CF | ((i + 0xa0) & 0xff);
+ }
+ } else {
+ if (i & HF) {
+ dab[DF+i] = CF | ((i + 0xfa) & 0xff);
+ } else {
+ dab[DF+i] = (i & 0xff);
+ }
+ }
+ }
+
+ printf("/************************************************ \n");
+ printf(" * Result table for Z8000 DAB instruction \n");
+ printf(" * \n");
+ printf(" * bits description \n");
+ printf(" * ---------------------------------------------- \n");
+ printf(" * 0..7 destination value \n");
+ printf(" * 8 carry flag before \n");
+ printf(" * 9 half carry flag before \n");
+ printf(" * 10 D flag (0 add/adc, 1 sub/sbc) \n");
+ printf(" * \n");
+ printf(" * result description \n");
+ printf(" * ---------------------------------------------- \n");
+ printf(" * 0..7 result value \n");
+ printf(" * 8 carry flag after \n");
+ printf(" ************************************************/\n");
+ printf("static const UINT16 Z8000_dab[0x800] = {\n");
+ for (i = 0; i < 0x800; i++) {
+ if ((i & 0x3ff) == 0) {
+ if (i & 0x400)
+ printf("\t/* sub/sbc results */\n");
+ else
+ printf("\t/* add/adc results */\n");
+ }
+ if ((i & 7) == 0) printf("\t");
+ printf("0x%03x,",dab[i]);
+ if ((i & 7) == 7) printf("\n");
+ }
+ printf("};\n");
+
+ return 0;
+}