[AARCH64] Document .arch and .arch_extension directive

2015-02-03  Renlin Li  <renlin.li@arm.com>

  gas/
    * doc/c-aarch64.texi (.arch): Document the directive.
    (.arch_extension): Likewise.

2 files changed, 23 insertions, 0 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 3322fce..5e77360 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2015-02-03  Renlin Li  <renlin.li@arm.com>
+
+	* doc/c-aarch64.texi (.arch): Document the directive.
+	(.arch_extension): Likewise.
+
 2015-02-03  Nick Clifton  <nickc@redhat.com>
 
 	* config/tc-rl78.h (TC_PARSE_CONS_EXPRESSION): Define.
diff --git a/gas/doc/c-aarch64.texi b/gas/doc/c-aarch64.texi
index 3488a1f..508dd11 100644
--- a/gas/doc/c-aarch64.texi
+++ b/gas/doc/c-aarch64.texi
@@ -232,6 +232,24 @@ The AArch64 architecture uses @sc{ieee} floating-point numbers.
 @table @code
 
 @c AAAAAAAAAAAAAAAAAAAAAAAAA
+
+@cindex @code{.arch} directive, AArch64
+@item .arch @var{name}
+Select the target architecture.  Valid values for @var{name} are the same as
+for the @option{-march} commandline option.
+
+Specifying @code{.arch} clears any previously selected architecture
+extensions.
+
+@cindex @code{.arch_extension} directive, AArch64
+@item .arch_extension @var{name}
+Add or remove an architecture extension to the target architecture.  Valid
+values for @var{name} are the same as those accepted as architectural
+extensions by the @option{-mcpu} commandline option.
+
+@code{.arch_extension} may be used multiple times to add or remove extensions
+incrementally to the architecture being compiled for.
+
 @c BBBBBBBBBBBBBBBBBBBBBBBBBB
 
 @cindex @code{.bss} directive, AArch64