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r20986 Tuesday 12th February, 2013 at 15:43:07 UTC by Carl
i386: fix undefined shift behavior (nw)

[src/emu/cpu/i386]

i386op16.c i386ops.c

trunk/src/emu/cpu/i386/i386ops.c

r20985	r20986
1	1	static UINT8 I386OP(shift_rotate8)(i386_state *cpustate, UINT8 modrm, UINT32 value, UINT8 shift)
2	2	{
3		UINT8 src = value;
	3	UINT32 src = value & 0xff;
4	4	UINT8 dst = value;
5	5
6	6	if( shift == 0 ) {
r20985	r20986
115	115	case 6:
116	116	shift &= 31;
117	117	dst = src << shift;
118		cpustate->CF = (src >> (8 - shift)) & 0x1;
	118	cpustate->CF = (shift <= 8) && (src >> (8 - shift));
119	119	SetSZPF8(dst);
120	120	CYCLES_RM(cpustate,modrm, CYCLES_ROTATE_REG, CYCLES_ROTATE_MEM);
121	121	break;

trunk/src/emu/cpu/i386/i386op16.c

r20985	r20986
1	1	static UINT16 I386OP(shift_rotate16)(i386_state *cpustate, UINT8 modrm, UINT32 value, UINT8 shift)
2	2	{
3		UINT16 src = value;
	3	UINT32 src = value & 0xffff;
4	4	UINT16 dst = value;
5	5
6	6	if( shift == 0 ) {
r20985	r20986
114	114	case 6:
115	115	shift &= 31;
116	116	dst = src << shift;
117		cpustate->CF = (src & (1 << (16-shift))) ? 1 : 0;
	117	cpustate->CF = (shift <= 16) && (src & (1 << (16-shift)));
118	118	SetSZPF16(dst);
119	119	CYCLES_RM(cpustate,modrm, CYCLES_ROTATE_REG, CYCLES_ROTATE_MEM);
120	120	break;

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