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Fixed MULS tests

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DIVS tests are no better
This commit is contained in:
transistor 2022-09-13 20:56:19 -07:00
parent 96e79329e7
commit 575501599a
1 changed files with 11 additions and 3 deletions
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14
src/cpus/m68k/execute.rs
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@ -440,8 +440,16 @@ impl M68k {
Sign::Unsigned => (existing % value, existing / value), Sign::Unsigned => (existing % value, existing / value),
}; };
self.set_compare_flags(quotient as u32, Size::Long, false, (quotient & 0xFFFF0000) != 0);
self.state.d_reg[dest as usize] = (remainder << 16) | (0xFFFF & quotient); // Only update the register if the quotient was large than a 16-bit number
if (quotient & 0xFFFF0000) == 0 {
self.set_compare_flags(quotient as u32, Size::Long, false, (quotient & 0xFFFF0000) != 0);
self.state.d_reg[dest as usize] = (remainder << 16) | (0xFFFF & quotient);
} else {
self.set_flag(Flags::Carry, true);
self.set_flag(Flags::Overflow, true);
self.set_flag(Flags::Negative, quotient < 0);
}
}, },
Instruction::DIVL(src, dest_h, dest_l, sign) => { Instruction::DIVL(src, dest_h, dest_l, sign) => {
let value = self.get_target_value(src, Size::Long, Used::Once)?; let value = self.get_target_value(src, Size::Long, Used::Once)?;
@ -637,7 +645,7 @@ impl M68k {
Sign::Unsigned => existing as u64 * value as u64, Sign::Unsigned => existing as u64 * value as u64,
}; };
self.set_compare_flags(result as u32, Size::Long, false, (result & 0xFFFFFFFF00000000) != 0); self.set_compare_flags(result as u32, Size::Long, false, false);
self.state.d_reg[dest as usize] = result as u32; self.state.d_reg[dest as usize] = result as u32;
}, },
Instruction::MULL(src, dest_h, dest_l, sign) => { Instruction::MULL(src, dest_h, dest_l, sign) => {