From: Noah Goldstein <goldstein.w.n@gmail.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: GNU C Library <libc-alpha@sourceware.org>,
"Carlos O'Donell" <carlos@systemhalted.org>
Subject: Re: [PATCH v2 1/2] x86: Move mem{p}{mov|cpy}_{chk_}erms to its own file
Date: Wed, 29 Jun 2022 16:09:23 -0700 [thread overview]
Message-ID: <CAFUsyf+_+77dpELmxrj-WV3sVV-fRuSzH=EkNPpE2kfRKJLLcQ@mail.gmail.com> (raw)
In-Reply-To: <CAMe9rOr1rhTrFt6gfNa_YA6=PY+aJezT_0EedT4GV560ypT1VA@mail.gmail.com>
On Wed, Jun 29, 2022 at 3:20 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Wed, Jun 29, 2022 at 3:13 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > The primary memmove_{impl}_unaligned_erms implementations don't
> > interact with this function. Putting them in same file both
> > wastes space and unnecessarily bloats a hot code section.
> > ---
> > sysdeps/x86_64/multiarch/Makefile | 1 +
> > sysdeps/x86_64/multiarch/memmove-erms.S | 53 +++++++++++++++++++
> > .../multiarch/memmove-vec-unaligned-erms.S | 50 -----------------
> > 3 files changed, 54 insertions(+), 50 deletions(-)
> > create mode 100644 sysdeps/x86_64/multiarch/memmove-erms.S
> >
> > diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
> > index 666ee4d5d6..62a4d96fb8 100644
> > --- a/sysdeps/x86_64/multiarch/Makefile
> > +++ b/sysdeps/x86_64/multiarch/Makefile
> > @@ -18,6 +18,7 @@ sysdep_routines += \
> > memmove-avx-unaligned-erms-rtm \
> > memmove-avx512-no-vzeroupper \
> > memmove-avx512-unaligned-erms \
> > + memmove-erms \
> > memmove-evex-unaligned-erms \
> > memmove-sse2-unaligned-erms \
> > memmove-ssse3 \
> > diff --git a/sysdeps/x86_64/multiarch/memmove-erms.S b/sysdeps/x86_64/multiarch/memmove-erms.S
> > new file mode 100644
> > index 0000000000..d98d21644b
> > --- /dev/null
> > +++ b/sysdeps/x86_64/multiarch/memmove-erms.S
> > @@ -0,0 +1,53 @@
>
> Need copyright notice.
Fixed in V3.
>
> > +#include <sysdep.h>
> > +
> > +#if defined USE_MULTIARCH && IS_IN (libc)
> > + .text
> > +ENTRY (__mempcpy_chk_erms)
> > + cmp %RDX_LP, %RCX_LP
> > + jb HIDDEN_JUMPTARGET (__chk_fail)
> > +END (__mempcpy_chk_erms)
> > +
> > +/* Only used to measure performance of REP MOVSB. */
> > +ENTRY (__mempcpy_erms)
> > + mov %RDI_LP, %RAX_LP
> > + /* Skip zero length. */
> > + test %RDX_LP, %RDX_LP
> > + jz 2f
> > + add %RDX_LP, %RAX_LP
> > + jmp L(start_movsb)
> > +END (__mempcpy_erms)
> > +
> > +ENTRY (__memmove_chk_erms)
> > + cmp %RDX_LP, %RCX_LP
> > + jb HIDDEN_JUMPTARGET (__chk_fail)
> > +END (__memmove_chk_erms)
> > +
> > +ENTRY (__memmove_erms)
> > + movq %rdi, %rax
> > + /* Skip zero length. */
> > + test %RDX_LP, %RDX_LP
> > + jz 2f
> > +L(start_movsb):
> > + mov %RDX_LP, %RCX_LP
> > + cmp %RSI_LP, %RDI_LP
> > + jb 1f
> > + /* Source == destination is less common. */
> > + je 2f
> > + lea (%rsi,%rcx), %RDX_LP
> > + cmp %RDX_LP, %RDI_LP
> > + jb L(movsb_backward)
> > +1:
> > + rep movsb
> > +2:
> > + ret
> > +L(movsb_backward):
> > + leaq -1(%rdi,%rcx), %rdi
> > + leaq -1(%rsi,%rcx), %rsi
> > + std
> > + rep movsb
> > + cld
> > + ret
> > +END (__memmove_erms)
> > +strong_alias (__memmove_erms, __memcpy_erms)
> > +strong_alias (__memmove_chk_erms, __memcpy_chk_erms)
> > +#endif
> > diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> > index d1518b8bab..04747133b7 100644
> > --- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> > +++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> > @@ -239,56 +239,6 @@ L(start):
> > #endif
> > #if defined USE_MULTIARCH && IS_IN (libc)
> > END (MEMMOVE_SYMBOL (__memmove, unaligned))
> > -# if VEC_SIZE == 16
> > -ENTRY (__mempcpy_chk_erms)
> > - cmp %RDX_LP, %RCX_LP
> > - jb HIDDEN_JUMPTARGET (__chk_fail)
> > -END (__mempcpy_chk_erms)
> > -
> > -/* Only used to measure performance of REP MOVSB. */
> > -ENTRY (__mempcpy_erms)
> > - mov %RDI_LP, %RAX_LP
> > - /* Skip zero length. */
> > - test %RDX_LP, %RDX_LP
> > - jz 2f
> > - add %RDX_LP, %RAX_LP
> > - jmp L(start_movsb)
> > -END (__mempcpy_erms)
> > -
> > -ENTRY (__memmove_chk_erms)
> > - cmp %RDX_LP, %RCX_LP
> > - jb HIDDEN_JUMPTARGET (__chk_fail)
> > -END (__memmove_chk_erms)
> > -
> > -ENTRY (__memmove_erms)
> > - movq %rdi, %rax
> > - /* Skip zero length. */
> > - test %RDX_LP, %RDX_LP
> > - jz 2f
> > -L(start_movsb):
> > - mov %RDX_LP, %RCX_LP
> > - cmp %RSI_LP, %RDI_LP
> > - jb 1f
> > - /* Source == destination is less common. */
> > - je 2f
> > - lea (%rsi,%rcx), %RDX_LP
> > - cmp %RDX_LP, %RDI_LP
> > - jb L(movsb_backward)
> > -1:
> > - rep movsb
> > -2:
> > - ret
> > -L(movsb_backward):
> > - leaq -1(%rdi,%rcx), %rdi
> > - leaq -1(%rsi,%rcx), %rsi
> > - std
> > - rep movsb
> > - cld
> > - ret
> > -END (__memmove_erms)
> > -strong_alias (__memmove_erms, __memcpy_erms)
> > -strong_alias (__memmove_chk_erms, __memcpy_chk_erms)
> > -# endif
> >
> > # ifdef SHARED
> > ENTRY (MEMMOVE_CHK_SYMBOL (__mempcpy_chk, unaligned_erms))
> > --
> > 2.34.1
> >
>
>
> --
> H.J.
next prev parent reply other threads:[~2022-06-29 23:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-28 15:27 [PATCH v1 " Noah Goldstein
2022-06-28 15:27 ` [PATCH v1 2/2] x86: Add support for building {w}memmove{_chk} with explicit ISA level Noah Goldstein
2022-06-30 3:13 ` [PATCH v4] " Noah Goldstein
2022-07-05 15:33 ` H.J. Lu
2022-07-05 19:23 ` Noah Goldstein
2022-07-05 19:38 ` H.J. Lu
2022-07-05 19:22 ` [PATCH v5] " Noah Goldstein
2022-07-05 19:41 ` [PATCH v6] " Noah Goldstein
2022-07-05 19:51 ` H.J. Lu
2022-06-29 19:31 ` [PATCH v1 1/2] x86: Move mem{p}{mov|cpy}_{chk_}erms to its own file H.J. Lu
2022-06-29 19:34 ` Noah Goldstein
2022-06-29 19:45 ` H.J. Lu
2022-06-29 19:48 ` Noah Goldstein
2022-06-29 19:59 ` H.J. Lu
2022-06-29 20:02 ` Noah Goldstein
2022-06-29 20:16 ` H.J. Lu
2022-06-29 22:13 ` Noah Goldstein
2022-06-29 22:13 ` [PATCH v2 " Noah Goldstein
2022-06-29 22:13 ` [PATCH v2 2/2] x86: Add support for building {w}memmove{_chk} with explicit ISA level Noah Goldstein
2022-06-29 23:27 ` H.J. Lu
2022-06-30 3:12 ` Noah Goldstein
2022-06-30 3:14 ` Noah Goldstein
2022-06-29 22:19 ` [PATCH v2 1/2] x86: Move mem{p}{mov|cpy}_{chk_}erms to its own file H.J. Lu
2022-06-29 23:09 ` Noah Goldstein [this message]
2022-06-29 23:07 ` [PATCH v3 " Noah Goldstein
2022-06-29 23:07 ` [PATCH v3 2/2] x86: Add support for building {w}memmove{_chk} with explicit ISA level Noah Goldstein
2022-06-29 23:30 ` [PATCH v3 1/2] x86: Move mem{p}{mov|cpy}_{chk_}erms to its own file H.J. Lu
2022-07-14 3:05 ` Sunil Pandey
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