added jump shortcut mnemonics to MU8A

README.md

@@ -163,6 +163,23 @@ specifications: here, it's `[selector] [value] [jumpaddr]` as opposed to
 `[value] [jumpaddr] [selector]`. This has been done for more convenient
 jump programming by selecting the condition as the first operand.
 
+The shortcut mnemonics for the jump operations are as follows:
+
+* `jeq` is a shortcut to `jmp 0` (direct jump if equals to zero)
+* `jgt` is a shortcut to `jmp 1` (direct jump if greater than zero)
+* `jlt` is a shortcut to `jmp 2` (direct jump if less than zero)
+* `jge` is a shortcut to `jmp 3` (direct jump if greater than or equals to zero)
+* `jle` is a shortcut to `jmp 4` (direct jump if less than or equals to zero)
+* `jne` is a shortcut to `jmp 5` (direct jump if not equals to zero)
+* `juc` is a shortcut to `jmp 6 0` (direct unconditional jump)
+* `ieq` is a shortcut to `jmp 7` (indirect jump if equals to zero)
+* `igt` is a shortcut to `jmp 8` (indirect jump if greater than zero)
+* `ilt` is a shortcut to `jmp 9` (indirect jump if less than zero)
+* `ige` is a shortcut to `jmp 10` (indirect jump if greater than or equals to zero)
+* `ile` is a shortcut to `jmp 11` (indirect jump if less than or equals to zero)
+* `ine` is a shortcut to `jmp 12` (indirect jump if not equals to zero)
+* `iuc` is a shortcut to `jmp 13 0` (indirect unconditional jump)
+
 ### Port input and output
 
 For the commands 3 and 4, mu808 supports optional non-zero port numbers, where
@@ -226,18 +243,19 @@ the MU8A assembly file to convert it into a plain text based machine code
 representation:
 
 1. Remove all comments (starting with `;` until the end of the line).
-2. Record the current line number N (not counting completely empty lines),
+2. Replace all jump shortcuts according to the above mnemonics.
+3. Record the current line number N (not counting completely empty lines),
    starting with 1.
-3. Split the line into space-delimited fields (1-based numbering as well).
-4. Check if the first field starts with `:`. If so, mark the mapping between
+4. Split the line into space-delimited fields (1-based numbering as well).
+5. Check if the first field starts with `:`. If so, mark the mapping between
    the field text and the number N, then remove the field from the set
    (so that the field 2 becomes field 1 and so on).
-5. If the field 1 is not already a number, replace the field 1 mnemonic text
+6. If the field 1 is not already a number, replace the field 1 mnemonic text
    with the numeric opcode if it can be found. If it's not a number and the
    mnemonic cannot be found, report an error and halt the process.
-6. Prepend N and the space to the current line and write the result into the
+7. Prepend N and the space to the current line and write the result into the
    target file.
-7. After the steps 1 to 6 are complete for every line, replace every label
+8. After the steps 1 to 7 are complete for every line, replace every label
    occurrence in the mapping with the corresponding number in the target file.
 
 Examples