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| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/doc/extend.texi | 5 |
2 files changed, 9 insertions, 0 deletions
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 <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> 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}}. |