o add bsnes

2009-04-08 21:29:36 +02:00
parent bcb4a055e9
commit 27b58a09f2
413 changed files with 71887 additions and 0 deletions
--- a/bsnes/smp/ssmp/core/opfn.cpp
+++ b/bsnes/smp/ssmp/core/opfn.cpp
@@ -0,0 +1,126 @@
+#ifdef SSMP_CPP
+
+uint8 sSMP::op_adc(uint8 x, uint8 y) {
+  int r = x + y + regs.p.c;
+  regs.p.n = r & 0x80;
+  regs.p.v = ~(x ^ y) & (x ^ r) & 0x80;
+  regs.p.h = (x ^ y ^ r) & 0x10;
+  regs.p.z = (uint8)r == 0;
+  regs.p.c = r > 0xff;
+  return r;
+}
+
+uint16 sSMP::op_addw(uint16 x, uint16 y) {
+  uint16 r;
+  regs.p.c = 0;
+  r  = op_adc(x, y);
+  r |= op_adc(x >> 8, y >> 8) << 8;
+  regs.p.z = r == 0;
+  return r;
+}
+
+uint8 sSMP::op_and(uint8 x, uint8 y) {
+  x &= y;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_cmp(uint8 x, uint8 y) {
+  int r = x - y;
+  regs.p.n = r & 0x80;
+  regs.p.z = (uint8)r == 0;
+  regs.p.c = r >= 0;
+  return x;
+}
+
+uint16 sSMP::op_cmpw(uint16 x, uint16 y) {
+  int r = x - y;
+  regs.p.n = r & 0x8000;
+  regs.p.z = (uint16)r == 0;
+  regs.p.c = r >= 0;
+  return x;
+}
+
+uint8 sSMP::op_eor(uint8 x, uint8 y) {
+  x ^= y;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_or(uint8 x, uint8 y) {
+  x |= y;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_sbc(uint8 x, uint8 y) {
+  int r = x - y - !regs.p.c;
+  regs.p.n = r & 0x80;
+  regs.p.v = (x ^ y) & (x ^ r) & 0x80;
+  regs.p.h = !((x ^ y ^ r) & 0x10);
+  regs.p.z = (uint8)r == 0;
+  regs.p.c = r >= 0;
+  return r;
+}
+
+uint16 sSMP::op_subw(uint16 x, uint16 y) {
+  uint16 r;
+  regs.p.c = 1;
+  r  = op_sbc(x, y);
+  r |= op_sbc(x >> 8, y >> 8) << 8;
+  regs.p.z = r == 0;
+  return r;
+}
+
+uint8 sSMP::op_inc(uint8 x) {
+  x++;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_dec(uint8 x) {
+  x--;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_asl(uint8 x) {
+  regs.p.c = x & 0x80;
+  x <<= 1;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_lsr(uint8 x) {
+  regs.p.c = x & 0x01;
+  x >>= 1;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_rol(uint8 x) {
+  unsigned carry = (unsigned)regs.p.c;
+  regs.p.c = x & 0x80;
+  x = (x << 1) | carry;
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+uint8 sSMP::op_ror(uint8 x) {
+  unsigned carry = (unsigned)regs.p.c << 7;
+  regs.p.c = x & 0x01;
+  x = carry | (x >> 1);
+  regs.p.n = x & 0x80;
+  regs.p.z = x == 0;
+  return x;
+}
+
+#endif //ifdef SSMP_CPP