Data commit

Task/Integer-overflow/6502-Assembly/integer-overflow-1.6502

@@ -0,0 +1,4 @@
+LDA #$7F
+CLC
+ADC #$01
+BVS ErrorHandler ;this branch will always be taken.

Task/Integer-overflow/6502-Assembly/integer-overflow-2.6502

@@ -0,0 +1,4 @@
+LDA #$FF
+CLC
+ADC #$01
+BCS ErrorHandler ;this branch will always be taken.

Task/Integer-overflow/6502-Assembly/integer-overflow-3.6502

@@ -0,0 +1,3 @@
+LDX #$7F
+INX              ;although X went from $7F to $80, INX does not affect the overflow flag!
+BVS ErrorHandler ;whether this branch is taken has NOTHING to do with the INX instruction.

Task/Integer-overflow/6502-Assembly/integer-overflow-4.6502

@@ -0,0 +1,3 @@
+LDA #%01000000
+ORA #%10000000   ;accumulator crossed from below $7F to above $80, but ORA doesn't affect the overflow flag.
+BVS ErrorHandler ;whether this branch is taken has NOTHING to do with the ORA instruction.

Task/Integer-overflow/6502-Assembly/integer-overflow-5.6502

@@ -0,0 +1,4 @@
+LDX #$FF
+INX                   ;the carry flag is not affected by this unsigned overflow, but the zero flag will be set
+                      ;    so we can detect overflow that way instead!
+BEQ OverflowOccurred  ;notice that we used BEQ here and not BCS.

Task/Integer-overflow/6502-Assembly/integer-overflow-6.6502

@@ -0,0 +1,16 @@
+;adding two 16-bit signed numbers, the first is stored at $10 and $11, the second at $12 and $13.
+;The result will be stored at $14 and $15.
+
+;add the low bytes
+
+LDA $10              ;low byte of first operand
+CLC
+ADC $12              ;low byte of second operand
+STA $14              ;low byte of sum
+
+;add the high bytes
+
+LDA $11              ;high byte of first operand
+ADC $13              ;high byte of second operand
+STA $15              ;high byte of result
+BVS HandleOverflow   ;only check for overflow when adding the most significant bytes.