From cd9c4e2b41b764df89232a454f4e1641cf9e3a32 Mon Sep 17 00:00:00 2001
From: Ivan Izaguirre <ivanizag@gmail.com>
Date: Wed, 23 Sep 2020 18:11:47 +0200
Subject: [PATCH] Double read on INC to pass a2audit tests

---
 core6502/operations.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core6502/operations.go b/core6502/operations.go
index 4bdf917..0c8f5d9 100644
--- a/core6502/operations.go
+++ b/core6502/operations.go
@@ -13,6 +13,10 @@ func buildOpTransfer(regSrc int, regDst int) opFunc {
 func buildOpIncDec(inc bool) opFunc {
 	return func(s *State, line []uint8, opcode opcode) {
 		value := resolveValue(s, line, opcode)
+		if opcode.addressMode == modeAbsoluteX || opcode.addressMode == modeAbsoluteY {
+			// Double read, needed to pass A2Audit for the Language Card
+			value = resolveValue(s, line, opcode)
+		}
 		if inc {
 			value++
 		} else {