as: D30V-Chars

1 
1 9.10.2.3 Special Characters
1 ...........................
1 
1 A semicolon (';') can be used anywhere on a line to start a comment that
1 extends to the end of the line.
1 
1    If a '#' appears as the first character of a line, the whole line is
1 treated as a comment, but in this case the line could also be a logical
1 line number directive (⇒Comments) or a preprocessor control
1 command (⇒Preprocessing).
1 
1    Sub-instructions may be executed in order, in reverse-order, or in
1 parallel.  Instructions listed in the standard one-per-line format will
1 be executed sequentially unless you use the '-O' option.
1 
1    To specify the executing order, use the following symbols:
1 '->'
1      Sequential with instruction on the left first.
1 
1 '<-'
1      Sequential with instruction on the right first.
1 
1 '||'
1      Parallel
1 
1    The D30V syntax allows either one instruction per line, one
1 instruction per line with the execution symbol, or two instructions per
1 line.  For example
1 'abs r2,r3 -> abs r4,r5'
1      Execute these sequentially.  The instruction on the right is in the
1      right container and is executed second.
1 
1 'abs r2,r3 <- abs r4,r5'
1      Execute these reverse-sequentially.  The instruction on the right
1      is in the right container, and is executed first.
1 
1 'abs r2,r3 || abs r4,r5'
1      Execute these in parallel.
1 
1 'ldw r2,@(r3,r4) ||'
1 'mulx r6,r8,r9'
1      Two-line format.  Execute these in parallel.
1 
1 'mulx a0,r8,r9'
1 'stw r2,@(r3,r4)'
1      Two-line format.  Execute these sequentially unless '-O' option is
1      used.  If the '-O' option is used, the assembler will determine if
1      the instructions could be done in parallel (the above two
1      instructions can be done in parallel), and if so, emit them as
1      parallel instructions.  The assembler will put them in the proper
1      containers.  In the above example, the assembler will put the 'stw'
1      instruction in left container and the 'mulx' instruction in the
1      right container.
1 
1 'stw r2,@(r3,r4) ->'
1 'mulx a0,r8,r9'
1      Two-line format.  Execute the 'stw' instruction followed by the
1      'mulx' instruction sequentially.  The first instruction goes in the
1      left container and the second instruction goes into right
1      container.  The assembler will give an error if the machine
1      ordering constraints are violated.
1 
1 'stw r2,@(r3,r4) <-'
1 'mulx a0,r8,r9'
1      Same as previous example, except that the 'mulx' instruction is
1      executed before the 'stw' instruction.
1 
1    Since '$' has no special meaning, you may use it in symbol names.
1