mirror of https://github.com/bsnes-emu/bsnes.git
62 lines
1.0 KiB
C++
62 lines
1.0 KiB
C++
auto Z80::CP(uint8 x) -> void {
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uint16 y = r.a - x;
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r.p.c = y > 0xff;
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r.p.n = 1;
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r.p.v = (r.a ^ x) & (r.a ^ y) & 0x80;
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r.p.h = (r.a ^ y ^ x) & 0x10;
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r.p.z = y == 0;
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r.p.s = y & 0x80;
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}
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auto Z80::instructionCP_ihl() -> void {
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CP(read(r.hl));
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}
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auto Z80::instructionCP_n() -> void {
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CP(read(r.pc++));
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}
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auto Z80::instructionCP_r(uint8_t& x) -> void {
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CP(x);
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}
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auto Z80::instructionDI() -> void {
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r.di = 1;
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}
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auto Z80::instructionIM(uint mode) -> void {
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r.im = mode;
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}
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auto Z80::instructionIN_a_in() -> void {
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r.a = in(read(r.pc++));
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}
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auto Z80::instructionIN_r_ic(uint8_t& x) -> void {
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x = in(read(r.c));
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r.p.n = 0;
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r.p.p = parity(x);
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r.p.h = 0;
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r.p.z = x == 0;
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r.p.s = x & 0x80;
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}
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auto Z80::instructionJP_c_nn(bool c) -> void {
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auto lo = read(r.pc++);
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auto hi = read(r.pc++);
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if(c) r.pc = hi << 8 | lo << 0;
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}
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auto Z80::instructionJP_rr(uint16_t& x) -> void {
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r.pc = x;
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}
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auto Z80::instructionJR_c(bool c) -> void {
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auto d = read(r.pc++);
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if(c) r.pc += (int8)d;
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}
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auto Z80::instructionNOP() -> void {
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}
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