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(as.info)D30V-Chars

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Special Characters
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   `;' and `#' are the line comment characters.  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.