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bsnes
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Update to v101r23 release. 

byuu says:

This is a really tiny WIP. Just wanted to add the known fixes before I start debugging it against Mednafen in a fork.

Changelog:

  - Z80: fixed flag calculations on 8-bit ADC, ADD, SBC, SUB
  - Z80: fixed flag calculations on 16-bit ADD
  - Z80: simplified DAA logic \[AWJ\]
  - Z80: RETI sets IFF1=IFF2 (same as RETN)
This commit is contained in:
Tim Allen 2016-11-15 18:20:42 +11:00
parent c2c957a9da
commit 1d7b674dd4
2 changed files with 14 additions and 27 deletions
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2
higan/emulator/emulator.hpp
View File

@ -12,7 +12,7 @@ using namespace nall;
namespace Emulator {
static const string Name = "higan";
static const string Version = "101.22";
static const string Version = "101.23";
static const string Author = "byuu";
static const string License = "GPLv3";
static const string Website = "http://byuu.org/";

39
higan/processor/z80/instructions.cpp
View File

@ -15,11 +15,11 @@ auto Z80::ADD(uint8 x, uint8 y, bool c) -> uint8 {
CF = z.bit(8);
NF = 0;
VF = ~(x ^ y) & (x ^ z) & 0x80;
VF = uint8(~(x ^ y) & (x ^ z)).bit(7);
XF = z.bit(3);
HF = (x ^ y ^ z) & 0x10;
HF = uint8(x ^ y ^ z).bit(4);
YF = z.bit(5);
ZF = (uint8)z == 0;
ZF = uint8(z) == 0;
SF = z.bit(7);
return z;
@ -230,11 +230,11 @@ auto Z80::SUB(uint8 x, uint8 y, bool c) -> uint8 {
CF = z.bit(8);
NF = 1;
VF = (x ^ y) & (x ^ z) & 0x80;
VF = uint8((x ^ y) & (x ^ z)).bit(7);
XF = z.bit(3);
HF = (x ^ y ^ z) & 0x10;
HF = uint8(x ^ y ^ z).bit(4);
YF = z.bit(5);
ZF = (uint8)z == 0;
ZF = uint8(z) == 0;
SF = z.bit(7);
return z;
@ -291,12 +291,13 @@ auto Z80::instructionADD_a_r(uint8& x) -> void {
}
auto Z80::instructionADD_hl_rr(uint16& x) -> void {
auto vf = VF, zf = ZF, sf = SF;
wait(4);
auto lo = ADD(HL >> 0, x >> 0);
wait(3);
auto hi = ADD(HL >> 8, x >> 8, CF);
HL = hi << 8 | lo << 0;
ZF = HL == 0;
VF = vf, ZF = zf, SF = sf; //restore unaffected flags
}
auto Z80::instructionAND_a_irr(uint16& x) -> void {
@ -390,27 +391,13 @@ auto Z80::instructionCPL() -> void {
}
auto Z80::instructionDAA() -> void {
uint8 lo = A.bits(0,3);
uint8 hi = A.bits(4,7);
uint8 diff;
auto a = A;
if(CF || (A.bits(0,7) > 0x99)) { A += NF ? -0x60 : 0x60; CF = 1; }
if(HF || (A.bits(0,3) > 0x09)) { A += NF ? -0x06 : 0x06; }
if(CF) {
diff = lo <= 9 && !HF ? 0x60 : 0x66;
} else if(lo >= 10) {
diff = hi <= 8 ? 0x06 : 0x66;
} else if(hi >= 10) {
diff = HF ? 0x66 : 0x60;
} else {
diff = HF ? 0x06 : 0x00;
}
if(NF == 0) A += diff;
if(NF == 1) A -= diff;
CF = CF || (lo <= 9 ? hi >= 10 : hi >= 9);
PF = parity(A);
XF = A.bit(3);
HF = NF ? (HF && lo <= 5) : (lo >= 10);
HF = uint8(A ^ a).bit(4);
YF = A.bit(5);
ZF = A == 0;
SF = A.bit(7);
@ -724,7 +711,7 @@ auto Z80::instructionRET_c(bool c) -> void {
auto Z80::instructionRETI() -> void {
PC = pop();
//todo: there's more to RETI than just PC restore ...
r.iff1 = r.iff2;
}
auto Z80::instructionRETN() -> void {