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B-16 March, 2003 Developer’s Manual
Intel
®
80200 Processor based on Intel
®
XScale
™
Microarchitecture
Optimization Guide
B.3.5 Effective Use of Addressing Modes
The Intel
®
80200 processor provides a variety of addressing modes that make indexing an array of
objects highly efficient. For a detailed description of these addressing modes please refer to the
ARM Architecture Reference Manual. The following code samples illustrate how various kinds of
array operations can be optimized to make use of these addressing modes:
;Set the contents of the word pointed to by r0 to the value
;contained in r1 and make r0 point to the next word
str r1,[r0], #4
;Increment the contents of r0 to make it point to the next word
;and set the contents of the word pointed to the value contained
;in r1
str r1, [r0, #4]!
;Set the contents of the word pointed to by r0 to the value
;contained in r1 and make r0 point to the previous word
str r1,[r0], #-4
;Decrement the contents of r0 to make it point to the previous
;word and set the contents of the word pointed to the value
;contained in r1
str r1,[r0, #-4]!