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cpu/decoder - Implement LD HL, SP + e8

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madmaurice 2023-08-29 23:46:09 +02:00
parent 7180ae8c40
commit 4e506a4d3c
1 changed files with 14 additions and 0 deletions
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14
cpu/decoder.cpp
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@ -474,6 +474,20 @@ void Cpu::executeInstruction()
mcycles = 4; mcycles = 4;
} }
break; break;
case 0xF8: // LD HL, SP + e8
{
u32 lhs = state.SP;
s32 rhs = (s8)readPC8();
u32 low_add = (lhs & 0x0FFF) + (rhs & 0x0FFF);
state.halfcarry = (low_add & 0x1000);
u32 res32 = lhs + rhs;
state.carry = (res32 & 0x10000);
state.HL = (u16)res32;
state.zero = false;
state.subtract = false;
mcycles = 3;
}
break;
default: default:
panic("Unknown opcode 0x%x\n",op); panic("Unknown opcode 0x%x\n",op);