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Attempted to implement DAA but still have a lot of failures

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This commit is contained in:
transistor 2023-05-13 21:35:50 -07:00
parent 5ec2fe4157
commit 6390a207a6
2 changed files with 48 additions and 8 deletions
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48
emulator/cpus/z80/src/execute.rs
View File

@ -193,8 +193,49 @@ impl Z80 {
self.set_flag(Flags::HalfCarry, true);
self.set_flag(Flags::AddSubtract, true);
},
//Instruction::DAA => {
//},
Instruction::DAA => {
// From <http://z80-heaven.wikidot.com/instructions-set:daa>
// if the least significant four bits of A contain a non-BCD digit (i. e. it is
// greater than 9) or the H flag is set, then $06 is added to the register. Then
// the four most significant bits are checked. If this more significant digit
// also happens to be greater than 9 or the C flag is set, then $60 is added.
// From <http://www.z80.info/zip/z80-documented.pdf>
//
// CF | high | HF | low | diff
// | nibble | | nibble |
//----------------------------------
// 0 | 0-9 | 0 | 0-9 | 00
// 0 | 0-9 | 1 | 0-9 | 06
// 0 | 0-8 | * | a-f | 06
// 0 | a-f | 0 | 0-9 | 60
// 1 | * | 0 | 0-9 | 60
// 1 | * | 1 | 0-9 | 66
// 1 | * | * | a-f | 66
// 0 | 9-f | * | a-f | 66
// 0 | a-f | 1 | 0-9 | 66
let mut value = self.get_register_value(Register::A);
let mut carry = false;
let mut half_carry = false;
if (value & 0x0F) > 9 || self.get_flag(Flags::HalfCarry) {
let (result, _, _, half_carry1) = add_bytes(value, 6);
value = result;
half_carry = half_carry1;
}
if (value & 0xF0) > 0x90 || self.get_flag(Flags::Carry) {
let (result, _, _, half_carry2) = add_bytes(value, 0x60);
value = result;
half_carry |= half_carry2;
carry = true;
}
self.set_register_value(Register::A, value);
self.set_numeric_flags(value as u16, Size::Byte);
self.set_parity_flags(value);
self.set_flag(Flags::HalfCarry, half_carry);
self.set_flag(Flags::Carry, carry);
},
Instruction::DEC16(regpair) => {
let value = self.get_register_pair_value(regpair);
@ -910,9 +951,8 @@ impl Z80 {
}
fn set_parity_flags(&mut self, value: u8) {
let mask = (Flags::Parity as u8) | (Flags::AddSubtract as u8);
let parity = if (value.count_ones() & 0x01) == 0 { Flags::Parity as u8 } else { 0 };
self.set_flags(mask, parity);
self.set_flags(Flags::Parity as u8, parity);
}
fn set_arithmetic_op_flags(&mut self, value: u16, size: Size, addsub: bool, carry: bool, overflow: bool, half_carry: bool) {

8
tests/rad_tests/latest.txt
View File

@ -1,4 +1,4 @@
Last run on 2023-05-13 at commit f3d1fd0ae2410a164c92150cc3caa0f525cbb4b7
Last run on 2023-05-13 at commit 5ec2fe41578e06279419b35826bb4b575bc14c09
00.json completed, all passed!
01.json completed, all passed!
@ -41,7 +41,7 @@ Last run on 2023-05-13 at commit f3d1fd0ae2410a164c92150cc3caa0f525cbb4b7
24.json completed, all passed!
25.json completed, all passed!
26.json completed, all passed!
27.json completed: 0 passed, 1000 FAILED
27.json completed: 396 passed, 604 FAILED
28.json completed, all passed!
29.json completed, all passed!
2a.json completed, all passed!
@ -643,5 +643,5 @@ fd f9.json completed, all passed!
fe.json completed, all passed!
ff.json completed, all passed!
passed: 628998, failed: 13002, total 98%
completed in 0m 31s
passed: 629394, failed: 12606, total 98%
completed in 0m 32s