ARM Compiler toolchain Assembler Reference: DCQ and DCQU

ARM Compiler toolchain Assembler Reference

Version 4.1

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DCQ and DCQU

The DCQ directive allocates one or more eight-byte blocks of memory, aligned on four-byte boundaries, and defines the initial runtime contents of the memory.

DCQU is the same, except that the memory alignment is arbitrary.

Syntax

{label} DCQ{U} {-}literal{,{-}literal}...

where:

literal: is a 64-bit numeric literal.
The range of numbers permitted is 0 to 2⁶⁴-1.
In addition to the characters normally permitted in a numeric literal, you can prefix literal with a minus sign. In this case, the range of numbers permitted is -2⁶³ to -1.
The result of specifying -n is the same as the result of specifying 2⁶⁴-n.

Usage

DCQ inserts up to three bytes of padding before the first defined eight-byte block, if necessary, to achieve four-byte alignment.

Use DCQU if you do not require alignment.

Examples

        AREA    MiscData, DATA, READWRITE
data    DCQ     -225,2_101     ; 2_101 means binary 101.
        DCQU    number+4       ; number must already be defined.

See also

Concept:

Using the Assembler:

Numeric literals.

Reference:

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