_rotr8, _rotr16

Microsoft 特定的

依指定的位元位置數目，將輸入值旋轉至最低有效位元 (LSB) 的右方。

語法

unsigned char _rotr8(
   unsigned char value,
   unsigned char shift
);
unsigned short _rotr16(
   unsigned short value,
   unsigned char shift
);

參數

value
[in]要旋轉的值。

shift
[in]要旋轉的位數。

傳回值

旋轉的值。

需求

內建	架構
_rotr8	x86、ARM、x64、ARM64
_rotr16	x86、ARM、x64、ARM64

標頭檔 < intrin.h>

備註

與右移作業不同，執行右旋轉時，從低端落下來的低階位會移至高階位位置。

範例

// rotr.cpp
#include <stdio.h>
#include <intrin.h>

#pragma intrinsic(_rotr8, _rotr16)

int main()
{
    unsigned char c = 'A', c1, c2;

    for (int i = 0; i < 8; i++)
    {
       printf_s("Rotating 0x%x right by %d bits gives 0x%x\n", c,
                i, _rotr8(c, i));
    }

    unsigned short s = 0x12;
    int nBit = 10;

    printf_s("Rotating unsigned short 0x%x right by %d bits "
             "gives 0x%x\n",
            s, nBit, _rotr16(s, nBit));
}

Rotating 0x41 right by 0 bits gives 0x41
Rotating 0x41 right by 1 bits gives 0xa0
Rotating 0x41 right by 2 bits gives 0x50
Rotating 0x41 right by 3 bits gives 0x28
Rotating 0x41 right by 4 bits gives 0x14
Rotating 0x41 right by 5 bits gives 0xa
Rotating 0x41 right by 6 bits gives 0x5
Rotating 0x41 right by 7 bits gives 0x82
Rotating unsigned short 0x12 right by 10 bits gives 0x480

END Microsoft 特定的

另請參閱

_rotl8、_rotl16
編譯器內建函式