elseif

Starts an alternative conditional assembly block, making assembly conditional on the truth of a boolean expression.

  .elseif bool-expr

  

bool-expr

Any boolean expression.

If bool-expr is true, the assembler processes the statements of the block. If bool-expr is false, the assembler skips the statements of the block.

You can use this directive to create a logical, multilevel if-then-else statement, according to this syntax:

  .if bool-expr statement-group

  

  [ .elseif bool-expr statement-group ]...

  

  [ .else statement-group ]

  

  .endif

  

(In this syntax, statement-group is any group of assembly-language statements.)

The .elseif directive can be part of more complicated logical structures, such as:

  .if bool-expr-1

  

      statement-group-1

  

  .elseif bool-expr-2

  

      statement-group-2

  

  .elseif bool-expr-3

  

      statement-group-3

  

  .elseif bool-expr-4

  

      statement-group-4

  

  .else

  

      statement-group-5

  

  .endif

  

• If this structure's bool-expr-1 is true, the assembler executes the statement-group-1 assembly-language statements, then goes to the .endif directive.
• If bool-expr-1 is false, the assembler skips statement-group-1, executing the first .elseif directive. If bool-expr-2 is true, the assembler executes statement-group-2, then goes to the .endif directive.
• If bool-expr-2 also is false, the assembler skips statement-group-2, executing the second .elseif directive.
• The assembler continues evaluating the boolean expressions of succeeding .elseif directives until it comes to a boolean expression that is true.
• If none of the boolean expressions are true, the assembler processes statement-group-5, because this structure includes an .else directive. (If none of the boolean values were true and there were no .else directive, the assembler would not process any of the statement groups.)