mirror of https://github.com/bsnes-emu/bsnes.git
123 lines
2.1 KiB
C++
Executable File
123 lines
2.1 KiB
C++
Executable File
uint8 SMP::op_adc(uint8 x, uint8 y) {
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int r = x + y + regs.p.c;
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regs.p.n = r & 0x80;
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regs.p.v = ~(x ^ y) & (x ^ r) & 0x80;
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regs.p.h = (x ^ y ^ r) & 0x10;
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regs.p.z = (uint8)r == 0;
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regs.p.c = r > 0xff;
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return r;
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}
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uint16 SMP::op_addw(uint16 x, uint16 y) {
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uint16 r;
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regs.p.c = 0;
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r = op_adc(x, y);
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r |= op_adc(x >> 8, y >> 8) << 8;
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regs.p.z = r == 0;
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return r;
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}
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uint8 SMP::op_and(uint8 x, uint8 y) {
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x &= y;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_cmp(uint8 x, uint8 y) {
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int r = x - y;
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regs.p.n = r & 0x80;
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regs.p.z = (uint8)r == 0;
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regs.p.c = r >= 0;
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return x;
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}
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uint16 SMP::op_cmpw(uint16 x, uint16 y) {
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int r = x - y;
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regs.p.n = r & 0x8000;
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regs.p.z = (uint16)r == 0;
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regs.p.c = r >= 0;
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return x;
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}
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uint8 SMP::op_eor(uint8 x, uint8 y) {
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x ^= y;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_or(uint8 x, uint8 y) {
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x |= y;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_sbc(uint8 x, uint8 y) {
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int r = x - y - !regs.p.c;
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regs.p.n = r & 0x80;
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regs.p.v = (x ^ y) & (x ^ r) & 0x80;
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regs.p.h = !((x ^ y ^ r) & 0x10);
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regs.p.z = (uint8)r == 0;
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regs.p.c = r >= 0;
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return r;
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}
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uint16 SMP::op_subw(uint16 x, uint16 y) {
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uint16 r;
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regs.p.c = 1;
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r = op_sbc(x, y);
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r |= op_sbc(x >> 8, y >> 8) << 8;
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regs.p.z = r == 0;
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return r;
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}
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uint8 SMP::op_inc(uint8 x) {
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x++;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_dec(uint8 x) {
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x--;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_asl(uint8 x) {
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regs.p.c = x & 0x80;
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x <<= 1;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_lsr(uint8 x) {
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regs.p.c = x & 0x01;
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x >>= 1;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_rol(uint8 x) {
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unsigned carry = (unsigned)regs.p.c;
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regs.p.c = x & 0x80;
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x = (x << 1) | carry;
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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uint8 SMP::op_ror(uint8 x) {
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unsigned carry = (unsigned)regs.p.c << 7;
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regs.p.c = x & 0x01;
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x = carry | (x >> 1);
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regs.p.n = x & 0x80;
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regs.p.z = x == 0;
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return x;
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}
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