9.9.2.3 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 (see Comments) or a preprocessor control command (see 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. 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 D10V syntax allows either one instruction per line, one instruction per line with the execution symbol, or two instructions per line. For example

abs a1 -> abs r0

Execute these sequentially. The instruction on the right is in the right container and is executed second.

abs r0 <- abs a1

Execute these reverse-sequentially. The instruction on the right is in the right container, and is executed first.

ld2w r2,@r8+ || mac a0,r0,r7

Execute these in parallel.

ld2w r2,@r8+ ||

mac a0,r0,r7

Two-line format. Execute these in parallel.

ld2w r2,@r8+

mac a0,r0,r7

Two-line format. Execute these sequentially. Assembler will put them in the proper containers.

ld2w r2,@r8+ ->

mac a0,r0,r7

Two-line format. Execute these sequentially. Same as above but second instruction will always go into right container.

Since ‘$’ has no special meaning, you may use it in symbol names.