Zilog Z8F0130 - Manual (Page 343)

UM013037-1212 Structured Assembly Inputs
Zilog Developer Studio II – Z8 Encore!
User Manual
319
For example, in the following looping structure:
.$while (r0 != #0)

ld r2,@r0

dec r0

.$wend
the assembler generates the following code:
00000D A6E000A 10.$while (r0 == #0)

000010 6B 06

000012 E320A 11ld r2,@r0

000014 30E0A 12dec r0

000016 8B F5A 13.$wend

000018A 14
The .$REPEAT directive generates code to test an execution-time condition after execut-
ing a block of statements and repeatedly executes the block until the condition is true.
Because the test is performed after executing the block, the block is executed at least once.
For example, in the following looping structure:
.$repeat

ld r1,@r0

dec r0

.$until (eq)
the assembler generates the following code:
000018 A6E000A 17.$repeat

000018 6B 06A 18ld r1,@r0

00001A E320A 19dec r0

00001C 30E0A 20.$until (eq)

00001E 8B F5A 21
Structured Assembly Inputs
The following sections describe the structured assembly input requirements:
•
IF Structured Assembly Block Inputs – see page 319
•
REPEAT Structured Assembly Block Inputs – see page 321
•
WHILE Structured Assembly Block Inputs – see page 322
IF Structured Assembly Block Inputs
The .$IF , .$ELSEIF , .$ELSE , and .$ENDIF assembler directives are used to test execu-
tion-time conditions and conditionally execute object code based on the results of the test.