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fix carry flag on NEG + get rid of unneeded casts

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This commit is contained in:
Michaël Banaan Ananas 2012-07-15 23:18:58 +00:00
parent 021333717a
commit bc1701628f
1 changed files with 21 additions and 30 deletions
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51
src/emu/cpu/mc68hc11/hc11ops.c
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@ -2262,8 +2262,7 @@ static void HC11OP(lsrd)(hc11_state *cpustate)
/* MUL 0x3d */
static void HC11OP(mul)(hc11_state *cpustate)
{
UINT16 r = (UINT8)REG_A * (UINT8)REG_B;
REG_D = r;
REG_D = REG_A * REG_B;
CLEAR_C(cpustate);
cpustate->ccr |= (REG_B & 0x80) ? CC_C : 0;
CYCLES(cpustate, 10);
@ -2272,26 +2271,24 @@ static void HC11OP(mul)(hc11_state *cpustate)
/* NEGA 0x40 */
static void HC11OP(nega)(hc11_state *cpustate)
{
INT8 r = 0x00 - REG_A;
REG_A = r;
REG_A = 0x00 - REG_A;
CLEAR_NZVC(cpustate);
SET_N8(r);
SET_Z8(r);
SET_N8(REG_A);
SET_Z8(REG_A);
cpustate->ccr |= (REG_A == 0x80) ? CC_V : 0;
cpustate->ccr |= (REG_A == 0x00) ? CC_C : 0;
cpustate->ccr |= (REG_A != 0x00) ? CC_C : 0;
CYCLES(cpustate, 2);
}
/* NEGB 0x50 */
static void HC11OP(negb)(hc11_state *cpustate)
{
INT8 r = 0x00 - REG_B;
REG_B = r;
REG_B = 0x00 - REG_B;
CLEAR_NZVC(cpustate);
SET_N8(r);
SET_Z8(r);
SET_N8(REG_B);
SET_Z8(REG_B);
cpustate->ccr |= (REG_B == 0x80) ? CC_V : 0;
cpustate->ccr |= (REG_B == 0x00) ? CC_C : 0;
cpustate->ccr |= (REG_B != 0x00) ? CC_C : 0;
CYCLES(cpustate, 2);
}
@ -2300,14 +2297,12 @@ static void HC11OP(negb)(hc11_state *cpustate)
static void HC11OP(neg_ext)(hc11_state *cpustate)
{
UINT16 adr = FETCH16(cpustate);
UINT8 i = READ8(cpustate, adr);
INT8 r = 0x00 - i;
i = r;
UINT8 i = 0x00 - READ8(cpustate, adr);
CLEAR_NZVC(cpustate);
SET_N8(r);
SET_Z8(r);
SET_N8(i);
SET_Z8(i);
cpustate->ccr |= (i == 0x80) ? CC_V : 0;
cpustate->ccr |= (i == 0x00) ? CC_C : 0;
cpustate->ccr |= (i != 0x00) ? CC_C : 0;
WRITE8(cpustate, adr, i);
CYCLES(cpustate, 6);
}
@ -2317,14 +2312,12 @@ static void HC11OP(neg_ext)(hc11_state *cpustate)
static void HC11OP(neg_indx)(hc11_state *cpustate)
{
UINT16 offset = FETCH(cpustate);
UINT8 i = READ8(cpustate, cpustate->ix + offset);
INT8 r = 0x00 - i;
i = r;
UINT8 i = 0x00 - READ8(cpustate, cpustate->ix + offset);
CLEAR_NZVC(cpustate);
SET_N8(r);
SET_Z8(r);
SET_N8(i);
SET_Z8(i);
cpustate->ccr |= (i == 0x80) ? CC_V : 0;
cpustate->ccr |= (i == 0x00) ? CC_C : 0;
cpustate->ccr |= (i != 0x00) ? CC_C : 0;
WRITE8(cpustate, cpustate->ix + offset, i);
CYCLES(cpustate, 6);
}
@ -2334,14 +2327,12 @@ static void HC11OP(neg_indx)(hc11_state *cpustate)
static void HC11OP(neg_indy)(hc11_state *cpustate)
{
UINT16 offset = FETCH(cpustate);
UINT8 i = READ8(cpustate, cpustate->iy + offset);
INT8 r = 0x00 - i;
i = r;
UINT8 i = 0x00 - READ8(cpustate, cpustate->iy + offset);
CLEAR_NZVC(cpustate);
SET_N8(r);
SET_Z8(r);
SET_N8(i);
SET_Z8(i);
cpustate->ccr |= (i == 0x80) ? CC_V : 0;
cpustate->ccr |= (i == 0x00) ? CC_C : 0;
cpustate->ccr |= (i != 0x00) ? CC_C : 0;
WRITE8(cpustate, cpustate->iy + offset, i);
CYCLES(cpustate, 7);
}