From 5a87ffe89c6509c295d22c9b105fa1126328f6c2 Mon Sep 17 00:00:00 2001
From: Test_User <hax@andrewyu.org>
Date: Wed, 15 Feb 2023 19:54:24 -0500
Subject: Add more instructions

---
 cpu/instructions/arithmetic/add.txt       | 10 ++++++++++
 cpu/instructions/arithmetic/decrement.txt | 10 ++++++++++
 cpu/instructions/arithmetic/increment.txt | 10 ++++++++++
 cpu/instructions/arithmetic/notes.txt     |  4 ++++
 cpu/instructions/arithmetic/subtract.txt  | 10 ++++++++++
 5 files changed, 44 insertions(+)
 create mode 100644 cpu/instructions/arithmetic/add.txt
 create mode 100644 cpu/instructions/arithmetic/decrement.txt
 create mode 100644 cpu/instructions/arithmetic/increment.txt
 create mode 100644 cpu/instructions/arithmetic/notes.txt
 create mode 100644 cpu/instructions/arithmetic/subtract.txt

(limited to 'cpu/instructions/arithmetic')

diff --git a/cpu/instructions/arithmetic/add.txt b/cpu/instructions/arithmetic/add.txt
new file mode 100644
index 0000000..3668033
--- /dev/null
+++ b/cpu/instructions/arithmetic/add.txt
@@ -0,0 +1,10 @@
+Number of parameters: 3
+
+Usage:
+	Add <output> <value0> <value1>
+
+Effect:
+	Adds <value0> to <value1> and stores it in <output>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/arithmetic/decrement.txt b/cpu/instructions/arithmetic/decrement.txt
new file mode 100644
index 0000000..7d56a45
--- /dev/null
+++ b/cpu/instructions/arithmetic/decrement.txt
@@ -0,0 +1,10 @@
+Number of parameters: 1
+
+Usage:
+	decrement <output>
+
+Effect:
+	Subtracts 1 from <output>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/arithmetic/increment.txt b/cpu/instructions/arithmetic/increment.txt
new file mode 100644
index 0000000..60cd856
--- /dev/null
+++ b/cpu/instructions/arithmetic/increment.txt
@@ -0,0 +1,10 @@
+Number of parameters: 1
+
+Usage:
+	increment <output>
+
+Effect:
+	Adds 1 to <output>
+
+Exceptions:
+	None
diff --git a/cpu/instructions/arithmetic/notes.txt b/cpu/instructions/arithmetic/notes.txt
new file mode 100644
index 0000000..29500cb
--- /dev/null
+++ b/cpu/instructions/arithmetic/notes.txt
@@ -0,0 +1,4 @@
+Unless otherwise specified, all arithmetic instructions:
+	Set the zero flag when the result is 0
+	Set the overflow flag when a signed operation results in inversion of the sign due to lack of bits to store the value
+	Set the carry flag when an unsigned operation results in a lower number due to lack of bits to store the value
diff --git a/cpu/instructions/arithmetic/subtract.txt b/cpu/instructions/arithmetic/subtract.txt
new file mode 100644
index 0000000..273ca46
--- /dev/null
+++ b/cpu/instructions/arithmetic/subtract.txt
@@ -0,0 +1,10 @@
+Number of parameters: 3
+
+Usage:
+	Subtract <output> <value0> <value1>
+
+Effect:
+	Subtracts <value0> from <value1> and stores it in <output>
+
+Exceptions:
+	None
-- 
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