[Bug string/19776] Improve in sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19776

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The branch, hjl/pr19776/master has been created
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=94a97fa99c9fc6bb1a579aabbde4509b9cb746b8

commit 94a97fa99c9fc6bb1a579aabbde4509b9cb746b8
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Mar 7 05:47:26 2016 -0800

    Enable __memcpy_chk_sse2_unaligned

    Check Fast_Unaligned_Load for __memcpy_chk_sse2_unaligned

        * sysdeps/x86_64/multiarch/memcpy_chk.S (__memcpy_chk): Check
        Fast_Unaligned_Load to enable __memcpy_chk_sse2_unaligned.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=164b82bb51a39bdfb21478b4ca28909fb265bdd1

commit 164b82bb51a39bdfb21478b4ca28909fb265bdd1
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Mar 7 05:44:58 2016 -0800

    Enable __mempcpy_chk_sse2_unaligned

    Check Fast_Unaligned_Load for __mempcpy_chk_sse2_unaligned

        * sysdeps/x86_64/multiarch/mempcpy_chk.S (__mempcpy_chk): Check
        Fast_Unaligned_Load to enable __mempcpy_chk_sse2_unaligned.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=681c975ae1db45f1f184e52172bb5288f84a184d

commit 681c975ae1db45f1f184e52172bb5288f84a184d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Mar 7 05:42:46 2016 -0800

    Enable __mempcpy_sse2_unaligned

    Check Fast_Unaligned_Load for __mempcpy_sse2_unaligned.

        * sysdeps/x86_64/multiarch/mempcpy.S (__mempcpy): Check
        Fast_Unaligned_Load to enable __mempcpy_sse2_unaligned.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9452ba101b95ec3a20074b1cc8fd2d84b6e0e859

commit 9452ba101b95ec3a20074b1cc8fd2d84b6e0e859
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Mar 6 17:06:41 2016 -0800

    Add __mempcpy_sse2_unaligned and _chk functions

    Add __mempcpy_chk_sse2_unaligned, __mempcpy_sse2_unaligned and
    __memcpy_chk_sse2_unaligned.

        * sysdeps/x86_64/multiarch/ifunc-impl-list.c
        (__libc_ifunc_impl_list): Test __memcpy_chk_sse2_unaligned,
        __mempcpy_chk_sse2_unaligned and __mempcpy_sse2_unaligned.
        * sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S
        (__mempcpy_chk_sse2_unaligned): New.
        (__mempcpy_sse2_unaligned): Likewise.
        (__memcpy_chk_sse2_unaligned): Likewise.
        (L(start): New label.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b812ca4864339d011edde57a86b27b80748bbfda

commit b812ca4864339d011edde57a86b27b80748bbfda
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Mar 6 16:52:53 2016 -0800

    Remove L(overlapping) from memcpy-sse2-unaligned.S

    Since memcpy doesn't need to check overlapping source and destination,
    we can remove L(overlapping).

        [BZ #19776]
        * sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S
        (L(overlapping)): Removed.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b74a495c76c05e9685482322a6a30d12a98a8a44

commit b74a495c76c05e9685482322a6a30d12a98a8a44
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Mar 6 13:46:54 2016 -0800

    Don't use RAX as scratch register

    To prepare sharing code with mempcpy, don't use RAX as scratch register
    so that RAX can be set to the return value at entrance.

        [BZ #19776]
        * sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S: Don't use
        RAX as scratch register.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ab3ae148820f5023254a4979d6eef60537f0bb03

commit ab3ae148820f5023254a4979d6eef60537f0bb03
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Mar 6 14:16:32 2016 -0800

    Remove dead code from memcpy-sse2-unaligned.S

    There are

    ENTRY(__memcpy_sse2_unaligned)
       movq  %rsi, %rax
       leaq  (%rdx,%rdx), %rcx
       subq  %rdi, %rax
       subq  %rdx, %rax
       cmpq  %rcx, %rax
       jb L(overlapping)

    When branch is taken,

       cmpq  %rsi, %rdi
       jae   .L3

    will never be taken.  We can remove the dead code.

        [BZ #19776]
        * sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S (.L3) Removed.

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