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SWTP: Fixed overflown bit logic for addition and subtraction (from Bill Beech)

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This commit is contained in:
Mark Pizzolato
2014-01-01 10:33:29 -08:00
parent 1666cef8e3
commit 028f152f6f
1 changed files with 3 additions and 5 deletions
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8
swtp6800/common/m6800.c
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@@ -311,7 +311,7 @@ t_stat sim_instr (void)
while (reason == 0) { /* loop until halted */ while (reason == 0) { /* loop until halted */
// dump_regs1(); // dump_regs1();
if (sim_interval <= 0) /* check clock queue */ if (sim_interval <= 0) /* check clock queue */
if ((reason = sim_process_event ())) if ((reason = sim_process_event ()))
break; break;
if (mem_fault) { /* memory fault? */ if (mem_fault) { /* memory fault? */
mem_fault = 0; /* reset fault flag */ mem_fault = 0; /* reset fault flag */
@@ -1886,8 +1886,7 @@ int32 get_flag(int32 flg)
void condevalVa(int32 op1, int32 op2) void condevalVa(int32 op1, int32 op2)
{ {
if (get_flag(CF)) { if (get_flag(CF)) {
COND_SET_FLAG_V(((op1 & 0x80) && (op2 & 0x80)) || ( COND_SET_FLAG_V((op1 & op2 & 0x80) || (((op1 | op2) & 0x80) == 0));
((op1 & 0x80) == 0) && ((op2 & 0x80) == 0)));
} }
} }
@@ -1896,8 +1895,7 @@ void condevalVa(int32 op1, int32 op2)
void condevalVs(int32 op1, int32 op2) void condevalVs(int32 op1, int32 op2)
{ {
if (get_flag(CF)) { if (get_flag(CF)) {
COND_SET_FLAG_V(((op1 & 0x80) && ((op2 & 0x80) == 0)) || COND_SET_FLAG_V(op1 & op2 & 0x80);
(((op1 & 0x80) == 0) && (op2 & 0x80)));
} }
} }