From 77bd32114a11ae1c62b734ca2e84199def85ef4f Mon Sep 17 00:00:00 2001
From: MadMaurice <madmaurice@zom.bi>
Date: Wed, 30 Aug 2023 13:34:14 +0200
Subject: [PATCH] cpu/decoder - Join code for INC rr and DEC rr
---
cpu/decoder.cpp | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/cpu/decoder.cpp b/cpu/decoder.cpp
index f945d32..989e199 100644
--- a/cpu/decoder.cpp
+++ b/cpu/decoder.cpp
@@ -119,14 +119,9 @@ void Cpu::executeInstruction()
break;
}
}
- else if((op & 0xCF) == 0x03) // INC rr
+ else if((op & 0xC7) == 0x03) // INC rr; DEC rr
{
- state.reg16((op >> 4) & 0x3) += 1;
- mcycles = 2;
- }
- else if((op & 0xCF) == 0x0B) // DEC rr
- {
- state.reg16((op >> 4) & 0x3) -= 1;
+ state.reg16((op >> 4) & 0x3) += ((op & 0x08) ? -1 : 1);
mcycles = 2;
}
else if((op & 0xE7) == 0xC2) // JP cc, nn: