OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

extend.texi: Reserve upper bits of memory model for future use. 

2012-02-15  Andrew MacLeod  <amacleod@redhat.com>

	* extend.texi: Reserve upper bits of memory model for future use.

From-SVN: r184277
This commit is contained in:
Andrew MacLeod 2012-02-15 16:41:25 +00:00 committed by Andrew Macleod
parent adc44a79d6
commit b1cef2a542
2 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
2012-02-15 Andrew MacLeod <amacleod@redhat.com>
* extend.texi: Reserve upper bits of memory model for future use.
2012-01-15 Georg-Johann Lay <avr@gjlay.de>
Anatoly Sokolov <aesok@post.ru>
Eric Weddington <eric.weddington@atmel.com>

5
gcc/doc/extend.texi
View File

@ -7092,6 +7092,11 @@ functions will map any runtime value to @code{__ATOMIC_SEQ_CST} rather
than invoke a runtime library call or inline a switch statement. This is
standard compliant, safe, and the simplest approach for now.
The memory model parameter is a signed int, but only the lower 8 bits are
reserved for the memory model. The remainder of the signed int is reserved
for future use and should be 0. Use of the predefined atomic values will
ensure proper usage.
@deftypefn {Built-in Function} @var{type} __atomic_load_n (@var{type} *ptr, int memmodel)
This built-in function implements an atomic load operation. It returns the
contents of @code{*@var{ptr}}.