Specifications

System Macros Invoked by Drivers

CASE

Generates a CASE instruction and its associated table.

Format

CASE src ,displist [,type=W] [,limit=#0] [,nmode=S^#]

Parameters

src

Source of the index value to be used with the CASE instruction.

displist

List of destinations to which control is to be dispatched, depending on the value

of the index.

[type=W]

Data type of src (B, W, or L).

[limit=#0]

Lower limit of the value of src.

[nmode=S^#]

Addressing mode used to reference the case-table entries; the default, short-literal

mode, is good for up to 63 entries.

Example

10$: CASE -

src=ITEMC,

displist=<FIRST,SECOND,THIRD,FOURTH>

This invocation of the CASE macro expands to the following code:

CASEW ITEMC,#0,S^#<<30001$-30000$>/2>-1

30000$:

.SIGNED_WORD FIRST-30000$

.SIGNED_WORD SECOND-30000$

.SIGNED_WORD THIRD-30000$

.SIGNED_WORD FOURTH-30000$

30001$:

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