FFS_EXPR

[Mike Stump]

On Sunday, August 4, 2002, at 02:02 PM, Micah Nathan Moore wrote:

> I am trying to learn the tree interface to gcc and I have
> come across FFS_EXPR.  I have not been able to figure out
> what type of expression this is.  I realize that I will
> probably look/feel/be an idiot for not seeing what FFS
> means, but I have to ask.

I don't see what relevance FFS has to anything you need to do or 
learn...   There are many things in gcc that you will not have to 
learn, this is just one of those things.  But if you really want to 
know, do man fss on a real system:

FS(3)                  System Library Functions Manual                 
FFS(3)

NAME
      ffs - find first bit set in a bit string

LIBRARY
      Standard C Library (libc, -lc)

SYNOPSIS
      #include <string.h>

      int
      ffs(int value);

DESCRIPTION
      The ffs() function finds the first bit set in value and returns 
the index
      of that bit.  Bits are numbered starting from 1, starting at the 
right-
      most bit.  A return value of 0 means that the argument was zero.

SEE ALSO
      bitstring(3)

HISTORY
      The ffs() function appeared in 4.3BSD.

BSD                             April 19, 1994                          
    BSD