From: sh <sh@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 18 Jan 2019 08:38:06 +0000 (+0000)
Subject: Document atomic fetch and nand
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=597c6d15f881785b3decf4a6a08a6cf64b04be47;p=thirdparty%2Fgcc.git

Document atomic fetch and nand

Copy code example for fetch and nand from "Legacy __sync Built-in
Functions for Atomic Memory Access" to "Built-in Functions for Memory
Model Aware Atomic Operations".

gcc/

	* doc/extend.texi (Built-in Functions for Memory Model Aware
	Atomic Operations): Document atomic fetch and nand.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@268062 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2a18cf80ee4d..9018b8f00990 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-01-18  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* doc/extend.texi (Built-in Functions for Memory Model Aware
+	Atomic Operations): Document atomic fetch and nand.
+
 2019-01-18  Martin Liska  <mliska@suse.cz>
 	    Richard Biener  <rguenther@suse.de>
 
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index ebd564891764..95d22ac1e3cf 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -11017,6 +11017,7 @@ they are not scaled by the size of the type to which the pointer points.
 
 @smallexample
 @{ *ptr @var{op}= val; return *ptr; @}
+@{ *ptr = ~(*ptr & val); return *ptr; @} // nand
 @end smallexample
 
 The object pointed to by the first argument must be of integer or pointer
@@ -11038,6 +11039,7 @@ the type to which the pointer points.
 
 @smallexample
 @{ tmp = *ptr; *ptr @var{op}= val; return tmp; @}
+@{ tmp = *ptr; *ptr = ~(*ptr & val); return tmp; @} // nand
 @end smallexample
 
 The same constraints on arguments apply as for the corresponding