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SCI: make bnot/mod/mul more verbose

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...and add abitility to easily add workarounds

svn-id: r51003
This commit is contained in:
Martin Kiewitz 2010-07-18 18:26:00 +00:00
parent d14635d6b2
commit d06603f151
1 changed files with 18 additions and 6 deletions
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24
engines/sci/engine/vm.cpp
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@ -1130,7 +1130,11 @@ void run_vm(EngineState *s, bool restoring) {
case op_bnot: // 0x00 (00)
// Binary not
s->r_acc = ACC_ARITHMETIC_L(0xffff ^ /*acc*/);
int16 value;
if (validate_signedInteger(s->r_acc, value))
s->r_acc = make_reg(0, 0xffff ^ value);
else
s->r_acc = arithmetic_lookForWorkaround(opcode, NULL, s->r_acc, NULL_REG);
break;
case op_add: // 0x01 (01)
@ -1197,13 +1201,17 @@ void run_vm(EngineState *s, bool restoring) {
break;
case op_mul: // 0x03 (03)
s->r_acc = ACC_ARITHMETIC_L(((int16)POP()) * (int16)/*acc*/);
r_temp = POP32();
int16 value1, value2;
if (validate_signedInteger(s->r_acc, value1) && validate_signedInteger(r_temp, value2))
s->r_acc = make_reg(0, value1 * value2);
else
s->r_acc = arithmetic_lookForWorkaround(opcode, NULL, s->r_acc, r_temp);
break;
case op_div: { // 0x04 (04)
r_temp = POP32();
int16 divisor;
int16 dividend;
int16 divisor, dividend;
if (validate_signedInteger(s->r_acc, divisor) && validate_signedInteger(r_temp, dividend))
s->r_acc = make_reg(0, (divisor != 0 ? dividend / divisor : 0));
else
@ -1211,8 +1219,12 @@ void run_vm(EngineState *s, bool restoring) {
break;
}
case op_mod: { // 0x05 (05)
int16 modulo = signed_validate_arithmetic(s->r_acc);
s->r_acc = make_reg(0, (modulo != 0 ? ((int16)POP()) % modulo : 0));
r_temp = POP32();
int16 modulo, value;
if (validate_signedInteger(s->r_acc, modulo) && validate_signedInteger(r_temp, value))
s->r_acc = make_reg(0, (modulo != 0 ? value % modulo : 0));
else
s->r_acc = arithmetic_lookForWorkaround(opcode, NULL, s->r_acc, r_temp);
break;
}
case op_shr: // 0x06 (06)