X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=cpu%2Ffame%2Ffamec_opcodes.h;h=2df6d78a26781827fe5bf87e0357da2dfe550ad4;hb=c041308933a54fce3b1e98b0228e19f96475ae40;hp=bd2efb022909095ea8ae6646370fb2c19f123e2c;hpb=f6aa2456a483b54566442d28d18a9f2fb2740125;p=picodrive.git

diff --git a/cpu/fame/famec_opcodes.h b/cpu/fame/famec_opcodes.h
index bd2efb0..2df6d78 100644
--- a/cpu/fame/famec_opcodes.h
+++ b/cpu/fame/famec_opcodes.h
@@ -16936,18 +16936,20 @@ OPCODE(0x4800)
 	u32 adr, res;
 	u32 src, dst;
 
-	res = DREGu8((Opcode >> 0) & 7);
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	dst = DREGu8((Opcode >> 0) & 7);
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	DREGu8((Opcode >> 0) & 7) = res;
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		DREGu8((Opcode >> 0) & 7) = res;
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 RET(6)
 }
@@ -16960,18 +16962,20 @@ OPCODE(0x4810)
 
 	adr = AREG((Opcode >> 0) & 7);
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(12)
@@ -16986,18 +16990,20 @@ OPCODE(0x4818)
 	adr = AREG((Opcode >> 0) & 7);
 	AREG((Opcode >> 0) & 7) += 1;
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(12)
@@ -17012,18 +17018,20 @@ OPCODE(0x4820)
 	adr = AREG((Opcode >> 0) & 7) - 1;
 	AREG((Opcode >> 0) & 7) = adr;
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(14)
@@ -17038,18 +17046,20 @@ OPCODE(0x4828)
 	FETCH_SWORD(adr);
 	adr += AREG((Opcode >> 0) & 7);
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(16)
@@ -17064,18 +17074,20 @@ OPCODE(0x4830)
 	adr = AREG((Opcode >> 0) & 7);
 	DECODE_EXT_WORD
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(18)
@@ -17089,18 +17101,20 @@ OPCODE(0x4838)
 
 	FETCH_SWORD(adr);
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(16)
@@ -17114,18 +17128,20 @@ OPCODE(0x4839)
 
 	FETCH_LONG(adr);
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(20)
@@ -17140,18 +17156,20 @@ OPCODE(0x481F)
 	adr = AREG(7);
 	AREG(7) += 2;
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(12)
@@ -17166,18 +17184,20 @@ OPCODE(0x4827)
 	adr = AREG(7) - 2;
 	AREG(7) = adr;
 	PRE_IO
-	READ_BYTE_F(adr, res)
-	res = 0x9a - res - ((flag_X >> M68K_SR_X_SFT) & 1);
+	READ_BYTE_F(adr, dst)
+	res = -dst - ((flag_X >> M68K_SR_X_SFT) & 1);
 
-	if (res != 0x9a)
+	if (res != 0)
 	{
-		if ((res & 0x0f) == 0xa) res = (res & 0xf0) + 0x10;
-		res &= 0xFF;
-	WRITE_BYTE_F(adr, res)
+		flag_V = res;
+		if (((res|dst) & 0x0f) == 0) res = (res & 0xf0) + 6;
+		res = (res + 0x9a) & 0xFF;
+		WRITE_BYTE_F(adr, res)
+		flag_V &= ~res;
 		flag_NotZ |= res;
 		flag_X = flag_C = M68K_SR_C;
 	}
-	else flag_X = flag_C = 0;
+	else flag_V = flag_X = flag_C = 0;
 	flag_N = res;
 	POST_IO
 RET(14)
@@ -18554,6 +18574,10 @@ RET(8)
 // ILLEGAL
 OPCODE(0x4AFC)
 {
+#ifdef PICODRIVE_HACK
+	extern void SekFinishIdleDet(void);
+	SekFinishIdleDet();
+#endif
 	SET_PC(execute_exception(M68K_ILLEGAL_INSTRUCTION_EX, GET_PC-2, GET_SR));
 RET(0)
 }
@@ -26933,19 +26957,19 @@ OPCODE(0x8100)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	src = DREGu8((Opcode >> 0) & 7);
 	dst = DREGu8((Opcode >> 9) & 7);
 	res = (dst & 0xF) - (src & 0xF) - ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res -= 6;
+	if (res > 0xF) corf = 6;
 	res += (dst & 0xF0) - (src & 0xF0);
-	if (res > 0x99)
-	{
-		res += 0xA0;
-		flag_X = flag_C = M68K_SR_C;
-	}
-	else flag_X = flag_C = 0;
-	flag_NotZ |= res & 0xFF;
+	flag_V = res;
+	flag_X = flag_C = (s32)res < (s32)corf ? M68K_SR_C : 0;
+	if (res > 0xff) res += 0xA0;
+	res = (res - corf) & 0xFF;
+	flag_V &= ~res;
+	flag_NotZ |= res;
 	flag_N = res;
 	DREGu8((Opcode >> 9) & 7) = res;
 RET(6)
@@ -26956,6 +26980,7 @@ OPCODE(0x8108)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG((Opcode >> 0) & 7) - 1;
 	AREG((Opcode >> 0) & 7) = adr;
@@ -26965,15 +26990,14 @@ OPCODE(0x8108)
 	AREG((Opcode >> 9) & 7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) - (src & 0xF) - ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res -= 6;
+	if (res > 0xF) corf = 6;
 	res += (dst & 0xF0) - (src & 0xF0);
-	if (res > 0x99)
-	{
-		res += 0xA0;
-		flag_X = flag_C = M68K_SR_C;
-	}
-	else flag_X = flag_C = 0;
-	flag_NotZ |= res & 0xFF;
+	flag_V = res;
+	flag_X = flag_C = (s32)res < (s32)corf ? M68K_SR_C : 0;
+	if (res > 0xff) res += 0xA0;
+	res = (res - corf) & 0xFF;
+	flag_V &= ~res;
+	flag_NotZ |= res;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
 	POST_IO
@@ -26985,6 +27009,7 @@ OPCODE(0x810F)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG(7) - 2;
 	AREG(7) = adr;
@@ -26994,15 +27019,14 @@ OPCODE(0x810F)
 	AREG((Opcode >> 9) & 7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) - (src & 0xF) - ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res -= 6;
+	if (res > 0xF) corf = 6;
 	res += (dst & 0xF0) - (src & 0xF0);
-	if (res > 0x99)
-	{
-		res += 0xA0;
-		flag_X = flag_C = M68K_SR_C;
-	}
-	else flag_X = flag_C = 0;
-	flag_NotZ |= res & 0xFF;
+	flag_V = res;
+	flag_X = flag_C = (s32)res < (s32)corf ? M68K_SR_C : 0;
+	if (res > 0xff) res += 0xA0;
+	res = (res - corf) & 0xFF;
+	flag_V &= ~res;
+	flag_NotZ |= res;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
 	POST_IO
@@ -27014,6 +27038,7 @@ OPCODE(0x8F08)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG((Opcode >> 0) & 7) - 1;
 	AREG((Opcode >> 0) & 7) = adr;
@@ -27023,15 +27048,14 @@ OPCODE(0x8F08)
 	AREG(7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) - (src & 0xF) - ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res -= 6;
+	if (res > 0xF) corf = 6;
 	res += (dst & 0xF0) - (src & 0xF0);
-	if (res > 0x99)
-	{
-		res += 0xA0;
-		flag_X = flag_C = M68K_SR_C;
-	}
-	else flag_X = flag_C = 0;
-	flag_NotZ |= res & 0xFF;
+	flag_V = res;
+	flag_X = flag_C = (s32)res < (s32)corf ? M68K_SR_C : 0;
+	if (res > 0xff) res += 0xA0;
+	res = (res - corf) & 0xFF;
+	flag_V &= ~res;
+	flag_NotZ |= res;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
 	POST_IO
@@ -27043,6 +27067,7 @@ OPCODE(0x8F0F)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG(7) - 2;
 	AREG(7) = adr;
@@ -27052,15 +27077,14 @@ OPCODE(0x8F0F)
 	AREG(7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) - (src & 0xF) - ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res -= 6;
+	if (res > 0xF) corf = 6;
 	res += (dst & 0xF0) - (src & 0xF0);
-	if (res > 0x99)
-	{
-		res += 0xA0;
-		flag_X = flag_C = M68K_SR_C;
-	}
-	else flag_X = flag_C = 0;
-	flag_NotZ |= res & 0xFF;
+	flag_V = res;
+	flag_X = flag_C = (s32)res < (s32)corf ? M68K_SR_C : 0;
+	if (res > 0xff) res += 0xA0;
+	res = (res - corf) & 0xFF;
+	flag_V &= ~res;
+	flag_NotZ |= res;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
 	POST_IO
@@ -34120,18 +34144,22 @@ OPCODE(0xC100)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	src = DREGu8((Opcode >> 0) & 7);
 	dst = DREGu8((Opcode >> 9) & 7);
 	res = (dst & 0xF) + (src & 0xF) + ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res += 6;
+	if (res > 9) corf = 6;
 	res += (dst & 0xF0) + (src & 0xF0);
-	if (res > 0x99)
+	flag_V = ~res;
+	res += corf;
+	if (res > 0x9F)
 	{
 		res -= 0xA0;
 		flag_X = flag_C = M68K_SR_C;
 	}
 	else flag_X = flag_C = 0;
+	flag_V &= res;
 	flag_NotZ |= res & 0xFF;
 	flag_N = res;
 	DREGu8((Opcode >> 9) & 7) = res;
@@ -34143,6 +34171,7 @@ OPCODE(0xC108)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG((Opcode >> 0) & 7) - 1;
 	AREG((Opcode >> 0) & 7) = adr;
@@ -34152,14 +34181,17 @@ OPCODE(0xC108)
 	AREG((Opcode >> 9) & 7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) + (src & 0xF) + ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res += 6;
+	if (res > 9) corf = 6;
 	res += (dst & 0xF0) + (src & 0xF0);
-	if (res > 0x99)
+	flag_V = ~res;
+	res += corf;
+	if (res > 0x9F)
 	{
 		res -= 0xA0;
 		flag_X = flag_C = M68K_SR_C;
 	}
 	else flag_X = flag_C = 0;
+	flag_V &= res;
 	flag_NotZ |= res & 0xFF;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
@@ -34172,6 +34204,7 @@ OPCODE(0xC10F)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG(7) - 2;
 	AREG(7) = adr;
@@ -34181,14 +34214,17 @@ OPCODE(0xC10F)
 	AREG((Opcode >> 9) & 7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) + (src & 0xF) + ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res += 6;
+	if (res > 9) corf = 6;
 	res += (dst & 0xF0) + (src & 0xF0);
-	if (res > 0x99)
+	flag_V = ~res;
+	res += corf;
+	if (res > 0x9F)
 	{
 		res -= 0xA0;
 		flag_X = flag_C = M68K_SR_C;
 	}
 	else flag_X = flag_C = 0;
+	flag_V &= res;
 	flag_NotZ |= res & 0xFF;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
@@ -34201,6 +34237,7 @@ OPCODE(0xCF08)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG((Opcode >> 0) & 7) - 1;
 	AREG((Opcode >> 0) & 7) = adr;
@@ -34210,14 +34247,17 @@ OPCODE(0xCF08)
 	AREG(7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) + (src & 0xF) + ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res += 6;
+	if (res > 9) corf = 6;
 	res += (dst & 0xF0) + (src & 0xF0);
-	if (res > 0x99)
+	flag_V = ~res;
+	res += corf;
+	if (res > 0x9F)
 	{
 		res -= 0xA0;
 		flag_X = flag_C = M68K_SR_C;
 	}
 	else flag_X = flag_C = 0;
+	flag_V &= res;
 	flag_NotZ |= res & 0xFF;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
@@ -34230,6 +34270,7 @@ OPCODE(0xCF0F)
 {
 	u32 adr, res;
 	u32 src, dst;
+	u32 corf = 0;
 
 	adr = AREG(7) - 2;
 	AREG(7) = adr;
@@ -34239,14 +34280,17 @@ OPCODE(0xCF0F)
 	AREG(7) = adr;
 	READ_BYTE_F(adr, dst)
 	res = (dst & 0xF) + (src & 0xF) + ((flag_X >> M68K_SR_X_SFT) & 1);
-	if (res > 9) res += 6;
+	if (res > 9) corf = 6;
 	res += (dst & 0xF0) + (src & 0xF0);
-	if (res > 0x99)
+	flag_V = ~res;
+	res += corf;
+	if (res > 0x9F)
 	{
 		res -= 0xA0;
 		flag_X = flag_C = M68K_SR_C;
 	}
 	else flag_X = flag_C = 0;
+	flag_V &= res;
 	flag_NotZ |= res & 0xFF;
 	flag_N = res;
 	WRITE_BYTE_F(adr, res)
@@ -37965,7 +38009,7 @@ OPCODE(0xE0B0)
 		{
 			if (sft == 1) res = (src >> 1) | ((flag_X & M68K_SR_X) << (32 - (M68K_SR_X_SFT + 1)));
 			else res = (src >> sft) | (src << (33 - sft)) | (((flag_X & M68K_SR_X) << (32 - (M68K_SR_X_SFT + 1))) >> (sft - 1));
-			flag_X = (src >> (32 - sft)) << M68K_SR_X_SFT;
+			flag_X = (src >> (sft - 1)) << M68K_SR_X_SFT;
 		}
 		else res = src;
 		flag_C = flag_X;