[Bug target/36079] [4.3/4.4 Regression] cld instruction is not emitted anymore.

["uros at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #13 from uros at gcc dot gnu dot org  2008-05-23 07:53 -------
Subject: Bug 36079

Author: uros
Date: Fri May 23 07:53:16 2008
New Revision: 135792

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135792
Log:
        PR target/36079
        * configure.ac: Handle --enable-cld.
        * configure: Regenerated.
        * config.gcc: Add USE_IX86_CLD to tm_defines for x86 targets.
        * config/i386/i386.h (struct machine_function): Add needs_cld field.
        (ix86_current_function_needs_cld): New define.
        * config/i386/i386.md (UNSPEC_CLD): New unspec volatile constant.
        (cld): New isns pattern.
        (strmov_singleop, rep_mov, strset_singleop, rep_stos, cmpstrnqi_nz_1,
        cmpstrnqi_1, strlenqi_1): Set ix86_current_function_needs_cld flag.
        * config/i386/i386.opt (mcld): New option.
        * config/i386/i386.c (ix86_expand_prologue): Emit cld insn if
        TARGET_CLD and ix86_current_function_needs_cld.
        (override_options): Use -mcld by default for 32-bit code if
        USE_IX86_CLD.

        * doc/install.texi (Options specification): Document --enable-cld.
        * doc/invoke.texi (Machine Dependent Options)
        [i386 and x86-64 Options]: Add -mcld option.
        (Intel 386 and AMD x86-64 Options): Document -mcld option.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config.gcc
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.h
    trunk/gcc/config/i386/i386.md
    trunk/gcc/config/i386/i386.opt
    trunk/gcc/configure
    trunk/gcc/configure.ac
    trunk/gcc/doc/install.texi
    trunk/gcc/doc/invoke.texi


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36079