diff options
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 5fc85a45abb..acd75e4f71b 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -4639,11 +4639,9 @@ returns the value that had previously been in memory. That is, @smallexample @{ tmp = *ptr; *ptr @var{op}= value; return tmp; @} +@{ tmp = *ptr; *ptr = ~tmp & value; return tmp; @} // nand @end smallexample -The builtin @code{__sync_fetch_and_nand} could be implemented by -@code{__sync_fetch_and_and(ptr, ~value)}. - @item @var{type} __sync_add_and_fetch (@var{type} *ptr, @var{type} value, ...) @itemx @var{type} __sync_sub_and_fetch (@var{type} *ptr, @var{type} value, ...) @itemx @var{type} __sync_or_and_fetch (@var{type} *ptr, @var{type} value, ...) @@ -4661,6 +4659,7 @@ return the new value. That is, @smallexample @{ *ptr @var{op}= value; return *ptr; @} +@{ *ptr = ~*ptr & value; return *ptr; @} // nand @end smallexample @item bool __sync_bool_compare_and_swap (@var{type} *ptr, @var{type} oldval @var{type} newval, ...) @@ -4673,7 +4672,7 @@ value of @code{*@var{ptr}} is @var{oldval}, then write @var{newval} into The ``bool'' version returns true if the comparison is successful and @var{newval} was written. The ``val'' version returns the contents -of @code{*@var{ptr}} after the operation. +of @code{*@var{ptr}} before the operation. @item __sync_synchronize (...) @findex __sync_synchronize |