參數(shù)資料
型號(hào): SC100
廠商: Motorola, Inc.
英文描述: High-Performance Fix-Point DSP Core(高性能定點(diǎn)型數(shù)字信號(hào)處理器內(nèi)核)
中文描述: 高性能固定點(diǎn)DSP內(nèi)核(高性能定點(diǎn)型數(shù)字信號(hào)處理器內(nèi)核)
文件頁(yè)數(shù): 89/212頁(yè)
文件大小: 2672K
代理商: SC100
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Language Features
SC100 C Compiler
3-61
3.4.5.5 Pragmas which apply to variables
These pragmas are placed immediately after the definition of the object(s) to which they refer. Objects
referred to by pragmas must first be explicitly defined.
3.4.5.5.1 Alignment of variables
Objects are usually aligned according to their size, as described in
Section 3.4.2,
Types and Sizes.
The
default alignment for arrays is determined by their base type.
An array may need to be aligned to a specified value before it can be passed to an external function. The
pragma
#pragma align
can be used to force the alignment of arrays passed to an external function, to
meet the specific alignment requirements of the function.
To force the alignment of an array before passing it to an external function, specify
#pragma align
,
followed by the defined array object, and either the value 4 for 4-byte (32-bit double word) alignment or
8 for 8-byte (64-bit quad word) alignment.
Certain instructions, such as
move.2w
and
move.4w
,
which move words in pairs, may require alignment
to be applied that is stricter than the alignment defined for the data types involved.
In certain cases, the compiler cannot assess the alignment for dynamic objects and has to assume that the
objects have the alignment requirements for their base type. As a result, the compiler cannot use the
multiword move instructions for these objects. By specifying the exact alignment for one or more objects,
you can enable the compiler to use these multiword moves and generate more efficient code.
You can use the pragma
#pragma align
to provide the compiler with specific alignment information
about pointers to arrays, in order to enable the compiler to use multiword move instructions.
To inform the compiler that the address of an array is aligned as required for multiword moves, specify
#pragma align
, followed by the pointer to the array object, and either the value 4 for 4-byte alignment
or 8 for 8-byte alignment. When using
#pragma align
in this way, you should ensure that the object is in
fact aligned as required, since this form of the pragma does not force the alignment.
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