算术运算符	名称	优先级
()	圆括号	1
+,-	正、负	2
*,/	乘、除	3
MOD	取模	3
+,-	加、减	4

 

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.386
.modelflat, stdcall

include   windows.inc
include   kernel32.inc
include   masm32.inc
include   debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.code
start:
    PrintDec 7 + 3          ;10
    PrintDec 7 - 3          ;4
    PrintDec 7 * 3          ;21
    PrintDec 7 / 3          ;2
    PrintDec 7 mod 3    ;1
    PrintDec 7 / 3 + 4    ;6
    PrintDec 7 / (3 + 4)  ;1
    ret
end start

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;EQ: 等于
;NE: 不等于

;LT: 小于
;LE: 小于等于

;GT: 大于
;GE: 大于等于

 

逻辑操作符(AND、OR、XOR、NOT)

 

高低分离符(HIGH、LOW、HIGHWORD、LOWWORD)

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.386
.modelflat, stdcall

include   windows.inc
include   kernel32.inc
include   masm32.inc
include   debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.code
start:
    PrintHex high         1122h ;11
    PrintHex low          1122h ;22
    PrintHex high     11223344h ;33
    PrintHex low      11223344h ;44
    PrintHex highword 11223344h ;1122
    PrintHex lowword  11223344h ;3344
    ret
end start

移位运算符(SHL、SHR)

.386
.modelflat, stdcall

include   windows.inc
include   kernel32.inc
include   masm32.inc
include   debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib

.code
start:
    PrintHex 12345678h shl 4 ;23456780
    PrintHex 12345678h shl 8 ;34567800
    PrintHex 12345678h shr 4 ;01234567
    PrintHex 12345678h shr 8 ;00123456
    ret
end start

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以上运算符(或伪指令)有些和汇编(硬)指令重名, 区别在于它们只用于常数表达式, 并在编译期出结果.

伪指令? (硬)指令?
MASM 的伪指令是 MASM 提供的, 它们告诉编译期如何编译, 其作用在生成 obj 文件之前;
(硬)指令是 CPU 提供的, 都有对应的二进制码, 它们作用在程序运行时.