Add control flow operands

design.md

@@ -23,6 +23,17 @@
 Divide register A by 5 and store the result in register A:
 `divi %A $5 %A;`
 
+Increment B until it is 10:
+```
+# Set B to zero
+addi $0 $0 %B;
+
+loop:
+addi $1 %B %B;
+lti %B $10;
+jmp loop;
+```
+
 ## Reserved symbols
 
 The following whitespace characters are used to separate symbols:
@@ -32,15 +43,17 @@ The following whitespace characters are used to separate symbols:
 - newline (`\n`)
 
 The following characters are used as identifiers:
-- dollar (`$`)
-- percentage (`%`)
-- colon (`:`)
-- semicolon (`;`)
-- hash (`#`)
+- dollar (`$`) for immediate (literal) values
+- percentage (`%`) for register identifiers
+- colon (`:`) for jump labels
+- semicolon (`;`) for statement termination
+- hash (`#`) for comments
 
-All operands are reserved keywords and can therefore NOT be used as labels.
+All symbols are reserved keywords and can therefore NOT be used as labels.
 
-## Operands
+## Symbols
+
+### Operands
 
 - `addi` add the first to the second argument and store the result in the third argument
 - `subi` subtract the first from the second argument and store the result in the third argument
@@ -48,4 +61,10 @@ All operands are reserved keywords and can therefore NOT be used as labels.
 - `muli` multiply the first by the second argument and store the result in the third argument
 - `shli` shift left the first argument by the number of positions given by the second argument and store the result in the third argument
 - `shri` shift right the first argument by the number of positions given by the second argument and store the result in the third argument
+
+### Control Flow
+
 - `jmp` jump to the label given by the first argument
+- `lti` execute next statement if argument 1 is less than argument 2 else skip the next statement
+- `gti` execute next statement if argument 1 is greater than argument 2 else skip the next statement
+- `eqi` execute the next statement if argument 1 is equal to argument 2 else skip the next statement