The ffs () function returns the position of the first (least significant) bit set in the word i. The least significant bit is position 1 and the most significant position is, for example, 32 or 64. The functions ffsll () and ffsl () do the same but take arguments of possibly different size.

The ffs () function returns the position of the first (least significant) bit set in the word i. The least significant bit is position 1 and the most significant position is, for example, 32 or 64. The functions ffsll () and ffsl () do the same but take arguments of possibly different size.

ffs — find first set bit SYNOPSIS top #include <strings.h> int ffs(int i); DESCRIPTION top The ffs() function shall find the first bit set (beginning with the least significant bit) in i, and return the index of that bit. Bits are numbered starting at one (the least significant bit).

ffs()函数返回单词i中设置的第一(最低有效)位的位置。最低有效位是位置1，最高有效位是例如32或64。函数ffsll()和ffsl()的功能相同，但参数的大小可能不同。

The ffs() function shall find the first bit set (beginning with the least significant bit) in i, and return the index of that bit. Bits are numbered starting at one (the least significant bit).

2018年1月2日 · 本文探讨Linux内核中的位操作函数ffs和fls，它们分别用于查找二进制数中第一个和最后一个1的位。 以整数32和34为例，介绍了ffs和fls的使用，并展示了ffs.h的源码片段。 今天阅读源码时遇到一个 函数：ffs，它时内核中实现的位操作函数，用来查找二进制表示数中第一个为1的位。 与ffs对应的还有fls.h，用来查找二进制数中最后一个为1的位。 整数34，对应的二进制为100010，第一个为1的位为2，最后一个为1的为是6。 * ffs - find first bit set. * @x: the word to …

The ffs (), ffsl () and ffsll () functions find the first (least signifi- cant) bit set in value and return the index of that bit. The fls (), flsl () and flsll () functions find the last (most signifi- cant) bit set in value and return the index of that bit. Bits are numbered starting at 1, the least significant bit. A return.

The ffs() function returns the position of the first (least signifi- cant) bit set in the word i. The least significant bit is position 1. and the most significant position is, for example, 32 or 64. The func- tions ffsll() and ffsl() do the same but take arguments of possibly. different size.

The ffs() function returns the position of the first (least significant) bit set in the word i. The least significant bit is position 1 and the most significant position is, for example, 32 or 64. The functions ffsll() and ffsl() do the same but take arguments of possibly different size. RETURN VALUE

The ffs (), ffsl () and ffsll () functions find the first (least signifi- cant) bit set in value and return the index of that bit. The fls (), flsl () and flsll () functions find the last (most significant) bit set in value and return the index of that bit. Bits are numbered starting at 1, the least significant bit. A return.