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分享关于align对齐问题
align是伪指令还是指令？
.data
ALIGN 2
mybytes BYTE 1,2,3,4
;这样定义的话，是1，2，3，4都偶地址对齐呢，还是只对第一个变量进行偶地址对齐?
.data
ALIGN 2
mybytes BYTE 1,2,3,4
;这样定义的话，是1，2，3，4都偶地址对齐呢，还是只对第一个变量进行偶地址对齐?
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大熊猫侯佩 2008-10-22
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伪指令，参看masm手册:
Syntax: ALIGN [number]
Description:
ALIGN aligns the next variable or instruction on an offset address
that is a multiple of <expression>. The <number> parameter must be
a power of 2 (1,2,4,8,...) less than or equal to the alignment of
the current segment. If <number> is omitted, the alignment is
determined by the align field of the preceding SEGMENT directive.
In a segment containing no instructions, the assembler pads each
skipped byte with nulls (00h). In a code segment, the assembler
inserts a no-operation sequence (not necessarily NOP instructions)
to fill the gap.
This directive is useful for optimizing data and instruction
fetches on processors with 16 or 32 bit data paths.
EVEN is a synonym for ALIGN 2.
Syntax: ALIGN [number]
Description:
ALIGN aligns the next variable or instruction on an offset address
that is a multiple of <expression>. The <number> parameter must be
a power of 2 (1,2,4,8,...) less than or equal to the alignment of
the current segment. If <number> is omitted, the alignment is
determined by the align field of the preceding SEGMENT directive.
In a segment containing no instructions, the assembler pads each
skipped byte with nulls (00h). In a code segment, the assembler
inserts a no-operation sequence (not necessarily NOP instructions)
to fill the gap.
This directive is useful for optimizing data and instruction
fetches on processors with 16 or 32 bit data paths.
EVEN is a synonym for ALIGN 2.
cnzdgs 2008-10-22
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align是伪指令。
第一个变量进行偶地址对齐。
第一个变量进行偶地址对齐。
