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Chapter 11. Alpha Dependent Features

.gprel32 expression

Computes the difference between the address in

expression

and the GP for the current object

file, and stores it in 4 bytes. In addition to being smaller than a full 8 byte address, this also does

not require a dynamic relocation when used in a shared library.

.t_floating expression

Stores

expression

as an ieee double precision value.

.s_floating expression

Stores

expression

as an ieee single precision value.

.f_floating expression

Stores

expression

as a VAX F format value.

.g_floating expression

Stores

expression

as a VAX G format value.

.d_floating expression

Stores

expression

as a VAX D format value.

.set feature

Enables or disables various assembler features. Using the positive name of the feature enables

while using

nofeature

disables.

at

Indicates that macro expansions may clobber the assembler temporary (

$at

or

$28

) regis 

ter. Some macros may not be expanded without this and will generate an error message if

noat

is in effect. When

at

is in effect, a warning will be generated if

$at

is used by the

programmer.

macro

Enables the expansion of macro instructions. Note that variants of real instructions, such as

br label

vs

br $31,label

are considered alternate forms and not macros.

move

reorder

volatile

These control whether and how the assembler may re order instructions. Accepted for com 

patibility with the OSF/1 assembler, but

as

does not do instruction scheduling, so these

features are ignored.

The following directives are recognized for compatibility with the OSF/1 assembler but are ignored.

.proc

.aproc

.reguse

.livereg

.option

.aent

.ugen

.eflag

.alias

.noalias