Datasheet

Differences

• the compilers now place zero initialized global and static definitions such as:

int a=0;

in the ZI data area. The variables are initialized by the C libraries at run time.

Previously such variables were placed in the RW area.

Changes to the inline assemblers

The inline assemblers support the ARMv5TE instructions. The inline assemblers do not

support VFP floating-point instructions.

Changes to the libraries

The ARM C libraries are now compiled with the

-split_ldm

compiler option. The

libraries preserve 8-byte alignment of the stack, and the default memory model

functions preserve 8-byte alignment of the heap. In addition:

• floating-point exceptions are disabled by default

• the ANSI C and C++ run-time support libraries are now combined

• a number of additional minor library variants are provided.

2.3.4 Changes to the assembler

This section describes:

• New instructions and directives

• New assembler options on page 2-24

• Obsolete assembler options on page 2-24

• Changed behavior on page 2-25.

New instructions and directives

The assembler provides support for new ARM architecture v5TE processors, including

the Intel XScale. The instruction set is now documented in the new ADS Assembler

Guide.

The ADS 1.1 assembler provides the following new directives:

PRESERVE8

Use this directive to mark assembly files that contain only functions that

preserve 8-byte alignment of the stack.

REQUIRE8

Use this directive to mark assembly files that contain at least one function

that requires 8-byte alignment of the stack

The assembler also supports the XScale coprocessor instructions

MAR

MRA

MIA

MIAPH

and

MIAxy