Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Added lazy flags for ROL and ROR.

Browse source
This commit is contained in:
SarahW 2019-03-30 14:41:02 +00:00
commit e2a1ae696f
3 changed files with 85 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

73
src/x86_flags.h
View file

@ -28,6 +28,14 @@ enum
FLAGS_SAR16,
FLAGS_SAR32,
FLAGS_ROL8,
FLAGS_ROL16,
FLAGS_ROL32,
FLAGS_ROR8,
FLAGS_ROR16,
FLAGS_ROR32,
FLAGS_INC8,
FLAGS_INC16,
FLAGS_INC32,
@ -81,6 +89,12 @@ static inline int ZF_SET()
case FLAGS_SBC32:
return !cpu_state.flags_res;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & Z_FLAG;
}
@ -127,6 +141,12 @@ static inline int NF_SET()
case FLAGS_SBC32:
return cpu_state.flags_res & 0x80000000;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & N_FLAG;
}
@ -169,6 +189,12 @@ static inline int PF_SET()
case FLAGS_SBC32:
return znptable8[cpu_state.flags_res & 0xff] & P_FLAG;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & P_FLAG;
}
@ -226,7 +252,21 @@ static inline int VF_SET()
return ((cpu_state.flags_op2 == 1) && (cpu_state.flags_op1 & 0x8000));
case FLAGS_SHR32:
return ((cpu_state.flags_op2 == 1) && (cpu_state.flags_op1 & 0x80000000));
case FLAGS_ROL8:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 7)) & 1;
case FLAGS_ROL16:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 15)) & 1;
case FLAGS_ROL32:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 31)) & 1;
case FLAGS_ROR8:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 1)) & 0x40;
case FLAGS_ROR16:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 1)) & 0x4000;
case FLAGS_ROR32:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 1)) & 0x40000000;
case FLAGS_UNKNOWN:
return cpu_state.flags & V_FLAG;
}
@ -283,6 +323,12 @@ static inline int AF_SET()
return ((cpu_state.flags_op1 & 0xf) < (cpu_state.flags_op2 & 0xf)) ||
((cpu_state.flags_op1 & 0xf) == (cpu_state.flags_op2 & 0xf) && (cpu_state.flags_res & 0xf) != 0);
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & A_FLAG;
}
@ -344,6 +390,18 @@ static inline int CF_SET()
case FLAGS_ZN16:
case FLAGS_ZN32:
return 0;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
return cpu_state.flags_res & 1;
case FLAGS_ROR8:
return (cpu_state.flags_res & 0x80) ? 1 : 0;
case FLAGS_ROR16:
return (cpu_state.flags_res & 0x8000) ? 1 :0;
case FLAGS_ROR32:
return (cpu_state.flags_res & 0x80000000) ? 1 : 0;
case FLAGS_DEC8:
case FLAGS_DEC16:
@ -396,6 +454,15 @@ static inline void flags_rebuild_c()
}
}
static inline int flags_res_valid()
{
if (cpu_state.flags_op == FLAGS_UNKNOWN ||
(cpu_state.flags_op >= FLAGS_ROL8 && cpu_state.flags_op <= FLAGS_ROR32))
return 0;
return 1;
}
static inline void setznp8(uint8_t val)
{
cpu_state.flags_op = FLAGS_ZN8;
@ -418,6 +485,10 @@ static inline void setznp32(uint32_t val)
cpu_state.flags_op1 = orig; \
cpu_state.flags_op2 = shift;
#define set_flags_rotate(op, res) \
cpu_state.flags_op = op; \
cpu_state.flags_res = res;
static inline void setadd8(uint8_t a, uint8_t b)
{
cpu_state.flags_op1 = a;