Reference Guide

58 Chapter 4

Assembler Directives and Pseudo-Operations

.ALLOW Directive

The .ALLOW directive tells the Assembler to temporarily allow PA-RISC

features from a higher version level of the PA-RISC architecture. The

.ALLOW directive also tells the Assembler to temporarily allow

implementation-speciﬁc features in the assembly source ﬁle.

Syntax

.ALLOW 1.1

Lines of source code

.ALLOW

Parameters

1.1 Allows PA-RISC 1.1 features.

2.0 Allows PA-RISC 2.0 features.

Discussion

Use the .ALLOW directive with the .LEVEL directive. The Assembler uses

the .LEVEL directive to mark the relocatable object ﬁle with the proper

PA-RISC architecture version level. In the source ﬁle, the Assembler

emits warning messages whenever a feature is used that is not

appropriate for the speciﬁed .LEVEL directive.

Use the .ALLOW directive when it is necessary to include features or

instructions from a later version of PA-RISC while leaving the

relocatable object ﬁle marked as an earlier PA-RISC architecture

version. For example, use the .ALLOW directive when you need to

include PA-RISC 2.0 features or instructions while leaving the

relocatable object ﬁle marked as a PA-RISC 1.1 architecture version.

NOTE A 2.0W parameter is not permitted with .ALLOW, because the code

generated for 2.0W(64-bit mode) is incompatible with other levels.