Win32 汇编 - 移位: SHL、SHR、SAL、SAR、ROL、ROR、RCL、RCR、SHLD、SHRD

SHL、SHR、SAL、SAR: 移位指令

;SHL(Shift Left):             逻辑左移
;SHR(Shift Right):            逻辑右移
;SAL(Shift Arithmetic Left):  算术左移
;SAR(Shift Arithmetic Right): 算术右移

;其中的 SHL 和 SAL 相同, 但 SHR 和 SAR 不同.

;SHL、SAL: 每位左移, 低位补 0,  高位进 CF
;SHR     : 每位右移, 低位进 CF, 高位补 0
;SAR     : 每位右移, 低位进 CF, 高位不变

;它们的结果影响 OF、SF、ZF、PF、CF
;它们的指令格式相同:
SHL r/m, i8
SHL r/m, CL


; Test24_1.asm
.386
.model flat, stdcallinclude    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib.code
main proc ;SHL、ALmov al, 11100111bshl al, 1PrintHex al ;CE - 11001110bsal al, 2PrintHex al ;38 - 00111000bmov al, 11100111bmov cl, 2shl al, clPrintHex al ;9C - 10011100b ;SHRmov al, 11100111bshr al, 2PrintHex al ;39 - 00111001b ;SARmov al, 11100111bsar al, 2PrintHex al ;F9 - 11111001bret
main endp
end main

ROL、ROR、RCL、RCR: 循环移位指令

;ROL(Rotate Left):                循环左移
;ROR(Rotate Right):               循环右移
;RCL(Rotate through Carry Left):  带进位循环左移
;RCR(Rotate through Carry Right): 带进位循环右移

;ROL: 循环左移, 高位到低位并送 CF
;ROR: 循环右移, 低位到高位并送 CF
;RCL: 循环左移, 进位值(原CF)到低位, 高位进 CF
;RCR: 循环右移, 进位值(原CF)到高位, 低位进 CF

;它们的结果影响 OF、CF
;它们的指令格式相同:
SHL r/m, i8
SHL r/m, CL


; Test24_2.asm
.386
.model flat, stdcallinclude    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib.code
main proc ;ROLmov al, 11000011brol al, 1PrintHex al ;87 - 010000111b ;RORmov al, 11000011bror al, 1PrintHex al ;E1 - 11100001b ;RCLclcmov al, 10101111brcl al, 1PrintHex al ;5E - 01011110bstcmov al, 10101111brcl al, 1PrintHex al ;5F - 01011111bclcmov al, 10101111brcl al, 2PrintHex al ;BD - 10111101b ;RCRclcmov al, 11101011brcr al, 2PrintHex al ;BA - 10111010bret
main endp
end main

SHLD、SHRD: 双精度移位

;SHLD(Double-Precision Shift Left):  双精度左移
;SHRD(Double-Precision Shift Right): 双精度右移

;SHLD 和 SHRD 有三个操作数
;操作数三: 是移位数目
;操作数一: 是目的操作数
;SHLD 左边被移出的位由操作数二相同数目的高位填充
;SHRD 右边被移出的位由操作数二相同数目的低位填充
;操作数二不变, 且须是寄存器

;它们的结果影响 OF、SF、ZF、PF、CF
;它们的指令格式相同:
SHLD r16/32/m16/m32, r16/32, i8
SHLD r16/32/m16/m32, r16/32, CL


; Test25_3.asm
.386
.model flat, stdcallinclude    windows.inc
include    kernel32.inc
include    masm32.inc
include    debug.inc
includelib kernel32.lib
includelib masm32.lib
includelib debug.lib.code
main proc ;SHLDmov ax, 1100110011110000bmov dx, 1111111100000000bshld ax, dx, 2PrintHex ax ;33C3 - 0011001111000011b ;SHRDmov ax, 0000111100110011bmov dx, 0000000011111111bshrd ax, dx, 2PrintHex ax ;C3CC - 1100001111001100bret
main endp
end main

（转载自：http://www.cnblogs.com/del/archive/2010/04/15/1712490.html）

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