From b1cef2a5429146655e2d9c99e29c6d2422f6255c Mon Sep 17 00:00:00 2001 From: Andrew MacLeod Date: Wed, 15 Feb 2012 16:41:25 +0000 Subject: extend.texi: Reserve upper bits of memory model for future use. 2012-02-15 Andrew MacLeod * extend.texi: Reserve upper bits of memory model for future use. From-SVN: r184277 --- gcc/ChangeLog | 4 ++++ gcc/doc/extend.texi | 5 +++++ 2 files changed, 9 insertions(+) (limited to 'gcc') diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3cbbf18..9d860de 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2012-02-15 Andrew MacLeod + + * extend.texi: Reserve upper bits of memory model for future use. + 2012-01-15 Georg-Johann Lay Anatoly Sokolov Eric Weddington diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index b666a2e..e4d17cf 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -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}}. -- cgit v1.1