* doc/invoke.texi (Option Summary, Xtensa Options): Document
-mserialize-volatile and -mno-serialize-volatile Xtensa options.
* config/xtensa/xtensa.c (print_operand): Do not emit MEMW instructions
unless TARGET_SERIALIZE_VOLATILE is enabled.
* config/xtensa/xtensa.md (*lsiu, *ssiu): Likewise.
* config/xtensa/xtensa.h (TARGET_DEFAULT): Add MASK_SERIALIZE_VOLATILE.
* config/xtensa/xtensa.opt (mserialize_volatile): New option.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@133234 138bc75d-0d04-0410-961f-82ee72b054a4