Info: (as) D30V-Chars

Info Catalog
as: D30V-Subs
as: D30V-Syntax
as: D30V-Guarded
as: D30V-Chars

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