Datasheet

Differences

Note

BATS is no longer shipped with ADS 1.1 or later.

The compiler performs instruction scheduling for ARM10 code by re-ordering machine

instructions to gain maximum speed and minimize wait states. The linker uses

BLX

interworking veneers when the underlying architecture (the ARM9E and ARM10, for

example, have architecture 5) supports it.

New ARM/Thumb procedure call standard

The Procedure Call Standard has been redesigned to:

• give equal emphasis to ARM and Thumb

• interwork between ARM-state and Thumb-state for all variants

• reduce the number of variants

• support position-independence

• produce compact code (especially with Thumb)

• be binary compatible with the previous most commonly used APCS variant.

The new ARM/Thumb Procedure Call Standard (ATPCS) enables a consistent ARM

and Thumb definition of Read Only Position Independence (also called Position

Independent Code), and Read Write Position Independence (also called Position

Independent Data) for both ARM and Thumb.

Floating-point support

Enhanced floating-point support is available in the compiler, assembler, and debugger:

• The compiler, assembler, and debugger support the new VFP floating-point

architecture in scalar mode.

• The compiler can generate VFP instructions for

double

and

float

operations. (The

inline assembler, however, does not support VFP.)

• The assembler supports VFP in vector mode. (New register names and directives

are available.)

• The compiler and assembler command-line option

-fpu

specifies the FPA

hardware, VFP hardware, or software variants.

Choose

-fpu FPA

-fpu softFPA

to retain the old SDT 2.50/2.51 format.