Arm VERSION 1.2 Instrukcja Użytkownika Pobierz pdf (Strona 119)

100

101

ARM Instruction Reference

Flexible offset syntax

Both pre-indexed and post-indexed offsets can be either of the following:

#expr

{-}Rm{, shift}

where:

is an optional minus sign. If

is present, the offset is subtracted from

Otherwise, the offset is added to

expr

is an expression evaluating to an integer in the range –4095 to +4095.

This is often a numeric constant (see examples below).

is a register containing a value to be used as the offset.

must not be r15.

shift

is an optional shift to be applied to

. It can be any one of:

ASR n

arithmetic shift right

bits. 1 ≤

≤ 32.

LSL n

logical shift left

bits. 0 ≤

≤ 31.

LSR n

logical shift right

bits. 1 ≤

≤ 32.

ROR n

rotate right

bits. 1 ≤

≤ 31.

RRX

rotate right one bit, with extend.

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 359 360

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Arm VERSION 1.2 Instrukcja Użytkownika Strona 119

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