mirror of https://github.com/bsnes-emu/bsnes.git
149 lines
2.6 KiB
C++
149 lines
2.6 KiB
C++
auto R6502::fp_adc() {
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int result = regs.a + rd + regs.p.c;
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regs.p.v = ~(regs.a ^ rd) & (regs.a ^ result) & 0x80;
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regs.p.c = (result > 0xff);
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regs.p.n = (result & 0x80);
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regs.p.z = ((uint8)result == 0);
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regs.a = result;
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}
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auto R6502::fp_and() {
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regs.a &= rd;
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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auto R6502::fp_asl() {
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regs.p.c = rd & 0x80;
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rd <<= 1;
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regs.p.n = (rd & 0x80);
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regs.p.z = (rd == 0);
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}
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auto R6502::fp_bit() {
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regs.p.n = (rd & 0x80);
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regs.p.v = (rd & 0x40);
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regs.p.z = ((rd & regs.a) == 0);
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}
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auto R6502::fp_cmp() {
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int r = regs.a - rd;
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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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}
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auto R6502::fp_cpx() {
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int r = regs.x - rd;
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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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}
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auto R6502::fp_cpy() {
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int r = regs.y - rd;
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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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}
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auto R6502::fp_dec() {
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rd--;
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regs.p.n = (rd & 0x80);
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regs.p.z = (rd == 0);
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}
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auto R6502::fp_eor() {
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regs.a ^= rd;
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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auto R6502::fp_inc() {
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rd++;
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regs.p.n = (rd & 0x80);
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regs.p.z = (rd == 0);
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}
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auto R6502::fp_lda() {
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regs.a = rd;
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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auto R6502::fp_ldx() {
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regs.x = rd;
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regs.p.n = (regs.x & 0x80);
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regs.p.z = (regs.x == 0);
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}
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auto R6502::fp_ldy() {
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regs.y = rd;
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regs.p.n = (regs.y & 0x80);
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regs.p.z = (regs.y == 0);
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}
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auto R6502::fp_lsr() {
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regs.p.c = rd & 0x01;
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rd >>= 1;
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regs.p.n = (rd & 0x80);
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regs.p.z = (rd == 0);
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}
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auto R6502::fp_ora() {
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regs.a |= rd;
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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auto R6502::fp_rla() {
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uint carry = (uint)regs.p.c;
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regs.p.c = regs.a & 0x80;
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regs.a = (regs.a << 1) | carry;
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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auto R6502::fp_rol() {
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uint carry = (uint)regs.p.c;
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regs.p.c = rd & 0x80;
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rd = (rd << 1) | carry;
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regs.p.n = (rd & 0x80);
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regs.p.z = (rd == 0);
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}
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auto R6502::fp_ror() {
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uint carry = (uint)regs.p.c << 7;
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regs.p.c = rd & 0x01;
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rd = carry | (rd >> 1);
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regs.p.n = (rd & 0x80);
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regs.p.z = (rd == 0);
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}
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auto R6502::fp_rra() {
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uint carry = (uint)regs.p.c << 7;
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regs.p.c = regs.a & 0x01;
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regs.a = carry | (regs.a >> 1);
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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auto R6502::fp_sbc() {
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rd ^= 0xff;
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return fp_adc();
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}
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auto R6502::fp_sla() {
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regs.p.c = regs.a & 0x80;
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regs.a <<= 1;
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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auto R6502::fp_sra() {
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regs.p.c = regs.a & 0x01;
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regs.a >>= 1;
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regs.p.n = (regs.a & 0x80);
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regs.p.z = (regs.a == 0);
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}
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