* doc/invoke.texi (ARM Options): Document -munaligned-access.

From-SVN: r189604

gcc/ChangeLog

+2012-07-18  Nick Clifton  <nickc@redhat.com>
+
+	* doc/invoke.texi (ARM Options): Document -munaligned-access.
+
 2012-07-18  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	* config/sh/sh.md (mulsidi3, umulsidi3): Remove constraints in
@@ -12,7 +16,7 @@
 	PR target/33135
 	* config/sh/sh.opt (mieee): Use Var instead of Mask.  Correct
 	description.
-	* config/sh/sh.c (sh_option_override): Do not change 
+	* config/sh/sh.c (sh_option_override): Do not change
 	flag_finite_math_only.  Set TARGET_IEEE to complement of
 	flag_finite_math_only.
 	* doc/invoke.texi (SH options): Add mno-ieee.  Correct description

gcc/doc/invoke.texi

@@ -497,7 +497,8 @@ Objective-C and Objective-C++ Dialects}.
 -mcaller-super-interworking  -mcallee-super-interworking @gol
 -mtp=@var{name} -mtls-dialect=@var{dialect} @gol
 -mword-relocations @gol
--mfix-cortex-m3-ldrd}
+-mfix-cortex-m3-ldrd @gol
+-munaligned-access}
 
 @emph{AVR Options}
 @gccoptlist{-mmcu=@var{mcu} -maccumulate-args -mbranch-cost=@var{cost} @gol
@@ -11049,6 +11050,23 @@ with overlapping destination and base registers are used.  This option avoids
 generating these instructions.  This option is enabled by default when
 @option{-mcpu=cortex-m3} is specified.
 
+@item -munaligned-access
+@itemx -mno-unaligned-access
+@opindex munaligned-access
+@opindex mno-unaligned-access
+Enables (or disables) reading and writing of 16- and 32- bit values
+from addresses that are not 16- or 32- bit aligned.  By default
+unaligned access is disabled for all pre-ARMv6 and all ARMv6-M
+architectures, and enabled for all other architectures.  If unaligned
+access is not enabled then words in packed data structures will be
+accessed a byte at a time.
+
+The ARM attribute @code{Tag_CPU_unaligned_access} will be set in the
+generated object file to either true or false, depending upon the
+setting of this option.  If unaligned access is enabled then the
+preprocessor symbol @code{__ARM_FEATURE_UNALIGNED} will also be
+defined.
+
 @end table
 
 @node AVR Options