Chapter 40. VAX Dependent Features

229

(long displacement)

OPCODE ..., foo ;

brb bar ;

foo: jmp destination ;

bar:

aobleq

aoblss

sobgeq

sobgtr

(byte displacement)

OPCODE

...

(word displacement)

OPCODE ..., foo ;

brb bar ;

foo: brw destination ;

bar:

(long displacement)

OPCODE ..., foo ;

brb bar ;

foo: jmp destination ;

bar:

40.6. VAX Operands

The immediate character is

$

for Unix compatibility, not

#

as DEC writes it.

The indirect character is

*

for Unix compatibility, not

@

as DEC writes it.

The displacement sizing character is

`

(an accent grave) for Unix compatibility, not

^

as DEC writes

it. The letter preceding

`

may have either case.

G

is not understood, but all other letters (

b i l s w

)

are understood.

Register names understood are

r0 r1 r2 ... r15 ap fp sp pc

. Upper and lower case letters

are equivalent.

For instance

tstb *w`$4(r5)

Any expression is permitted in an operand. Operands are comma separated.