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[Bug string/19776] Improve in sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 07 Mar 2016 15:57:19 +0000
- Subject: [Bug string/19776] Improve in sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S
- Auto-submitted: auto-generated
- References: <bug-19776-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19776
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Unreachable code in |Improve in
|sysdeps/x86_64/multiarch/me |sysdeps/x86_64/multiarch/me
|mcpy-sse2-unaligned.S |mcpy-sse2-unaligned.S
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #1)
> 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)
Since memcpy doesn't need to check overlapping source and destination,
we can remove L(overlapping).
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