From: Sunil Pandey <skpgkp2@gmail.com>
To: "H.J. Lu" <hjl.tools@gmail.com>,
Libc-stable Mailing List <libc-stable@sourceware.org>
Cc: Noah Goldstein <goldstein.w.n@gmail.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH v1 08/23] x86: Optimize strspn in strspn-c.c
Date: Thu, 12 May 2022 12:39:09 -0700 [thread overview]
Message-ID: <CAMAf5_cwcYP21f-Hy5QAFz6K13QU25TFTS76n7X3BzQVetetkQ@mail.gmail.com> (raw)
In-Reply-To: <CAMe9rOo7oks15kPUaZqd=Z1J1Xe==FJoECTNU5mBca9WTHgf1w@mail.gmail.com>
On Thu, Mar 24, 2022 at 11:58 AM H.J. Lu via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> On Wed, Mar 23, 2022 at 2:59 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > Use _mm_cmpeq_epi8 and _mm_movemask_epi8 to get strlen instead of
> > _mm_cmpistri. Also change offset to unsigned to avoid unnecessary
> > sign extensions.
> >
> > geometric_mean(N=20) of all benchmarks that dont fallback on
> > sse2; New / Original: .901
> >
> > All string/memory tests pass.
> > ---
> > Geomtric Mean N=20 runs; All functions page aligned
> > len, align1, align2, pos, New Time / Old Time
> > 1, 0, 0, 512, 0.768
> > 1, 1, 0, 512, 0.666
> > 1, 0, 1, 512, 1.193
> > 1, 1, 1, 512, 0.872
> > 2, 0, 0, 512, 0.698
> > 2, 2, 0, 512, 0.687
> > 2, 0, 2, 512, 1.393
> > 2, 2, 2, 512, 0.944
> > 3, 0, 0, 512, 0.691
> > 3, 3, 0, 512, 0.676
> > 3, 0, 3, 512, 1.388
> > 3, 3, 3, 512, 0.948
> > 4, 0, 0, 512, 0.74
> > 4, 4, 0, 512, 0.678
> > 4, 0, 4, 512, 1.421
> > 4, 4, 4, 512, 0.943
> > 5, 0, 0, 512, 0.691
> > 5, 5, 0, 512, 0.675
> > 5, 0, 5, 512, 1.348
> > 5, 5, 5, 512, 0.952
> > 6, 0, 0, 512, 0.685
> > 6, 6, 0, 512, 0.67
> > 6, 0, 6, 512, 1.333
> > 6, 6, 6, 512, 0.95
> > 7, 0, 0, 512, 0.688
> > 7, 7, 0, 512, 0.675
> > 7, 0, 7, 512, 1.344
> > 7, 7, 7, 512, 0.919
> > 8, 0, 0, 512, 0.716
> > 8, 0, 8, 512, 0.935
> > 9, 0, 0, 512, 0.716
> > 9, 1, 0, 512, 0.712
> > 9, 0, 9, 512, 0.956
> > 9, 1, 9, 512, 0.992
> > 10, 0, 0, 512, 0.699
> > 10, 2, 0, 512, 0.68
> > 10, 0, 10, 512, 0.952
> > 10, 2, 10, 512, 0.932
> > 11, 0, 0, 512, 0.705
> > 11, 3, 0, 512, 0.685
> > 11, 0, 11, 512, 0.956
> > 11, 3, 11, 512, 0.927
> > 12, 0, 0, 512, 0.695
> > 12, 4, 0, 512, 0.675
> > 12, 0, 12, 512, 0.948
> > 12, 4, 12, 512, 0.928
> > 13, 0, 0, 512, 0.7
> > 13, 5, 0, 512, 0.678
> > 13, 0, 13, 512, 0.944
> > 13, 5, 13, 512, 0.931
> > 14, 0, 0, 512, 0.703
> > 14, 6, 0, 512, 0.678
> > 14, 0, 14, 512, 0.949
> > 14, 6, 14, 512, 0.93
> > 15, 0, 0, 512, 0.694
> > 15, 7, 0, 512, 0.678
> > 15, 0, 15, 512, 0.953
> > 15, 7, 15, 512, 0.924
> > 16, 0, 0, 512, 1.021
> > 16, 0, 16, 512, 1.067
> > 17, 0, 0, 512, 0.991
> > 17, 1, 0, 512, 0.984
> > 17, 0, 17, 512, 0.979
> > 17, 1, 17, 512, 0.993
> > 18, 0, 0, 512, 0.992
> > 18, 2, 0, 512, 1.008
> > 18, 0, 18, 512, 1.016
> > 18, 2, 18, 512, 0.993
> > 19, 0, 0, 512, 0.984
> > 19, 3, 0, 512, 0.985
> > 19, 0, 19, 512, 1.007
> > 19, 3, 19, 512, 1.006
> > 20, 0, 0, 512, 0.969
> > 20, 4, 0, 512, 0.968
> > 20, 0, 20, 512, 0.975
> > 20, 4, 20, 512, 0.975
> > 21, 0, 0, 512, 0.992
> > 21, 5, 0, 512, 0.992
> > 21, 0, 21, 512, 0.98
> > 21, 5, 21, 512, 0.97
> > 22, 0, 0, 512, 0.989
> > 22, 6, 0, 512, 0.987
> > 22, 0, 22, 512, 0.99
> > 22, 6, 22, 512, 0.985
> > 23, 0, 0, 512, 0.989
> > 23, 7, 0, 512, 0.98
> > 23, 0, 23, 512, 1.0
> > 23, 7, 23, 512, 0.993
> > 24, 0, 0, 512, 0.99
> > 24, 0, 24, 512, 0.998
> > 25, 0, 0, 512, 1.01
> > 25, 1, 0, 512, 1.0
> > 25, 0, 25, 512, 0.97
> > 25, 1, 25, 512, 0.967
> > 26, 0, 0, 512, 1.009
> > 26, 2, 0, 512, 0.986
> > 26, 0, 26, 512, 0.997
> > 26, 2, 26, 512, 0.993
> > 27, 0, 0, 512, 0.984
> > 27, 3, 0, 512, 0.997
> > 27, 0, 27, 512, 0.989
> > 27, 3, 27, 512, 0.976
> > 28, 0, 0, 512, 0.991
> > 28, 4, 0, 512, 1.003
> > 28, 0, 28, 512, 0.986
> > 28, 4, 28, 512, 0.989
> > 29, 0, 0, 512, 0.986
> > 29, 5, 0, 512, 0.985
> > 29, 0, 29, 512, 0.984
> > 29, 5, 29, 512, 0.977
> > 30, 0, 0, 512, 0.991
> > 30, 6, 0, 512, 0.987
> > 30, 0, 30, 512, 0.979
> > 30, 6, 30, 512, 0.974
> > 31, 0, 0, 512, 0.995
> > 31, 7, 0, 512, 0.995
> > 31, 0, 31, 512, 0.994
> > 31, 7, 31, 512, 0.984
> > 4, 0, 0, 32, 0.861
> > 4, 1, 0, 32, 0.864
> > 4, 0, 1, 32, 0.962
> > 4, 1, 1, 32, 0.967
> > 4, 0, 0, 64, 0.884
> > 4, 2, 0, 64, 0.818
> > 4, 0, 2, 64, 0.889
> > 4, 2, 2, 64, 0.918
> > 4, 0, 0, 128, 0.942
> > 4, 3, 0, 128, 0.884
> > 4, 0, 3, 128, 0.931
> > 4, 3, 3, 128, 0.883
> > 4, 0, 0, 256, 0.964
> > 4, 4, 0, 256, 0.922
> > 4, 0, 4, 256, 0.956
> > 4, 4, 4, 256, 0.93
> > 4, 5, 0, 512, 0.833
> > 4, 0, 5, 512, 1.027
> > 4, 5, 5, 512, 0.929
> > 4, 0, 0, 1024, 0.998
> > 4, 6, 0, 1024, 0.986
> > 4, 0, 6, 1024, 0.984
> > 4, 6, 6, 1024, 0.977
> > 4, 0, 0, 2048, 0.991
> > 4, 7, 0, 2048, 0.987
> > 4, 0, 7, 2048, 0.996
> > 4, 7, 7, 2048, 0.98
> > 10, 1, 0, 64, 0.826
> > 10, 1, 1, 64, 0.907
> > 10, 2, 0, 64, 0.829
> > 10, 2, 2, 64, 0.91
> > 10, 3, 0, 64, 0.83
> > 10, 3, 3, 64, 0.915
> > 10, 4, 0, 64, 0.83
> > 10, 4, 4, 64, 0.911
> > 10, 5, 0, 64, 0.828
> > 10, 5, 5, 64, 0.905
> > 10, 6, 0, 64, 0.828
> > 10, 6, 6, 64, 0.812
> > 10, 7, 0, 64, 0.83
> > 10, 7, 7, 64, 0.819
> > 6, 0, 0, 0, 1.261
> > 6, 0, 0, 1, 1.252
> > 6, 0, 1, 1, 0.845
> > 6, 0, 0, 2, 1.27
> > 6, 0, 2, 2, 0.85
> > 6, 0, 0, 3, 1.269
> > 6, 0, 3, 3, 0.845
> > 6, 0, 0, 4, 1.287
> > 6, 0, 4, 4, 0.852
> > 6, 0, 0, 5, 1.278
> > 6, 0, 5, 5, 0.851
> > 6, 0, 0, 6, 1.269
> > 6, 0, 6, 6, 0.841
> > 6, 0, 0, 7, 1.268
> > 6, 0, 7, 7, 0.851
> > 6, 0, 0, 8, 1.291
> > 6, 0, 8, 8, 0.837
> > 6, 0, 0, 9, 1.283
> > 6, 0, 9, 9, 0.831
> > 6, 0, 0, 10, 1.252
> > 6, 0, 10, 10, 0.997
> > 6, 0, 0, 11, 1.295
> > 6, 0, 11, 11, 1.046
> > 6, 0, 0, 12, 1.296
> > 6, 0, 12, 12, 1.038
> > 6, 0, 0, 13, 1.287
> > 6, 0, 13, 13, 1.082
> > 6, 0, 0, 14, 1.284
> > 6, 0, 14, 14, 1.001
> > 6, 0, 0, 15, 1.286
> > 6, 0, 15, 15, 1.002
> > 6, 0, 0, 16, 0.894
> > 6, 0, 16, 16, 0.874
> > 6, 0, 0, 17, 0.892
> > 6, 0, 17, 17, 0.974
> > 6, 0, 0, 18, 0.907
> > 6, 0, 18, 18, 0.993
> > 6, 0, 0, 19, 0.909
> > 6, 0, 19, 19, 0.99
> > 6, 0, 0, 20, 0.894
> > 6, 0, 20, 20, 0.978
> > 6, 0, 0, 21, 0.89
> > 6, 0, 21, 21, 0.958
> > 6, 0, 0, 22, 0.893
> > 6, 0, 22, 22, 0.99
> > 6, 0, 0, 23, 0.899
> > 6, 0, 23, 23, 0.986
> > 6, 0, 0, 24, 0.893
> > 6, 0, 24, 24, 0.989
> > 6, 0, 0, 25, 0.889
> > 6, 0, 25, 25, 0.982
> > 6, 0, 0, 26, 0.889
> > 6, 0, 26, 26, 0.852
> > 6, 0, 0, 27, 0.89
> > 6, 0, 27, 27, 0.832
> > 6, 0, 0, 28, 0.89
> > 6, 0, 28, 28, 0.831
> > 6, 0, 0, 29, 0.89
> > 6, 0, 29, 29, 0.838
> > 6, 0, 0, 30, 0.907
> > 6, 0, 30, 30, 0.833
> > 6, 0, 0, 31, 0.888
> > 6, 0, 31, 31, 0.837
> > 6, 0, 0, 32, 0.853
> > 6, 0, 32, 32, 0.828
> > 6, 0, 0, 33, 0.857
> > 6, 0, 33, 33, 0.947
> > 6, 0, 0, 34, 0.847
> > 6, 0, 34, 34, 0.954
> > 6, 0, 0, 35, 0.841
> > 6, 0, 35, 35, 0.94
> > 6, 0, 0, 36, 0.854
> > 6, 0, 36, 36, 0.958
> > 6, 0, 0, 37, 0.856
> > 6, 0, 37, 37, 0.957
> > 6, 0, 0, 38, 0.839
> > 6, 0, 38, 38, 0.962
> > 6, 0, 0, 39, 0.866
> > 6, 0, 39, 39, 0.945
> > 6, 0, 0, 40, 0.845
> > 6, 0, 40, 40, 0.961
> > 6, 0, 0, 41, 0.858
> > 6, 0, 41, 41, 0.961
> > 6, 0, 0, 42, 0.862
> > 6, 0, 42, 42, 0.825
> > 6, 0, 0, 43, 0.864
> > 6, 0, 43, 43, 0.82
> > 6, 0, 0, 44, 0.843
> > 6, 0, 44, 44, 0.81
> > 6, 0, 0, 45, 0.859
> > 6, 0, 45, 45, 0.816
> > 6, 0, 0, 46, 0.866
> > 6, 0, 46, 46, 0.81
> > 6, 0, 0, 47, 0.858
> > 6, 0, 47, 47, 0.807
> > 6, 0, 0, 48, 0.87
> > 6, 0, 48, 48, 0.87
> > 6, 0, 0, 49, 0.871
> > 6, 0, 49, 49, 0.874
> > 6, 0, 0, 50, 0.87
> > 6, 0, 50, 50, 0.881
> > 6, 0, 0, 51, 0.868
> > 6, 0, 51, 51, 0.875
> > 6, 0, 0, 52, 0.873
> > 6, 0, 52, 52, 0.871
> > 6, 0, 0, 53, 0.866
> > 6, 0, 53, 53, 0.882
> > 6, 0, 0, 54, 0.863
> > 6, 0, 54, 54, 0.876
> > 6, 0, 0, 55, 0.851
> > 6, 0, 55, 55, 0.871
> > 6, 0, 0, 56, 0.867
> > 6, 0, 56, 56, 0.888
> > 6, 0, 0, 57, 0.862
> > 6, 0, 57, 57, 0.899
> > 6, 0, 0, 58, 0.873
> > 6, 0, 58, 58, 0.798
> > 6, 0, 0, 59, 0.881
> > 6, 0, 59, 59, 0.785
> > 6, 0, 0, 60, 0.867
> > 6, 0, 60, 60, 0.797
> > 6, 0, 0, 61, 0.872
> > 6, 0, 61, 61, 0.791
> > 6, 0, 0, 62, 0.859
> > 6, 0, 62, 62, 0.79
> > 6, 0, 0, 63, 0.87
> > 6, 0, 63, 63, 0.796
> >
> > sysdeps/x86_64/multiarch/strspn-c.c | 86 +++++++++++++----------------
> > 1 file changed, 39 insertions(+), 47 deletions(-)
> >
> > diff --git a/sysdeps/x86_64/multiarch/strspn-c.c b/sysdeps/x86_64/multiarch/strspn-c.c
> > index 8fb3aba64d..6124033ceb 100644
> > --- a/sysdeps/x86_64/multiarch/strspn-c.c
> > +++ b/sysdeps/x86_64/multiarch/strspn-c.c
> > @@ -62,81 +62,73 @@ __strspn_sse42 (const char *s, const char *a)
> > return 0;
> >
> > const char *aligned;
> > - __m128i mask;
> > - int offset = (int) ((size_t) a & 15);
> > + __m128i mask, maskz, zero;
> > + unsigned int maskz_bits;
> > + unsigned int offset = (int) ((size_t) a & 15);
> > + zero = _mm_set1_epi8 (0);
> > if (offset != 0)
> > {
> > /* Load masks. */
> > aligned = (const char *) ((size_t) a & -16L);
> > __m128i mask0 = _mm_load_si128 ((__m128i *) aligned);
> > -
> > - mask = __m128i_shift_right (mask0, offset);
> > + maskz = _mm_cmpeq_epi8 (mask0, zero);
> >
> > /* Find where the NULL terminator is. */
> > - int length = _mm_cmpistri (mask, mask, 0x3a);
> > - if (length == 16 - offset)
> > - {
> > - /* There is no NULL terminator. */
> > - __m128i mask1 = _mm_load_si128 ((__m128i *) (aligned + 16));
> > - int index = _mm_cmpistri (mask1, mask1, 0x3a);
> > - length += index;
> > -
> > - /* Don't use SSE4.2 if the length of A > 16. */
> > - if (length > 16)
> > - return __strspn_sse2 (s, a);
> > -
> > - if (index != 0)
> > - {
> > - /* Combine mask0 and mask1. We could play games with
> > - palignr, but frankly this data should be in L1 now
> > - so do the merge via an unaligned load. */
> > - mask = _mm_loadu_si128 ((__m128i *) a);
> > - }
> > - }
> > + maskz_bits = _mm_movemask_epi8 (maskz) >> offset;
> > + if (maskz_bits != 0)
> > + {
> > + mask = __m128i_shift_right (mask0, offset);
> > + offset = (unsigned int) ((size_t) s & 15);
> > + if (offset)
> > + goto start_unaligned;
> > +
> > + aligned = s;
> > + goto start_loop;
> > + }
> > }
> > - else
> > - {
> > - /* A is aligned. */
> > - mask = _mm_load_si128 ((__m128i *) a);
> >
> > - /* Find where the NULL terminator is. */
> > - int length = _mm_cmpistri (mask, mask, 0x3a);
> > - if (length == 16)
> > - {
> > - /* There is no NULL terminator. Don't use SSE4.2 if the length
> > - of A > 16. */
> > - if (a[16] != 0)
> > - return __strspn_sse2 (s, a);
> > - }
> > + /* A is aligned. */
> > + mask = _mm_loadu_si128 ((__m128i *) a);
> > +
> > + /* Find where the NULL terminator is. */
> > + maskz = _mm_cmpeq_epi8 (mask, zero);
> > + maskz_bits = _mm_movemask_epi8 (maskz);
> > + if (maskz_bits == 0)
> > + {
> > + /* There is no NULL terminator. Don't use SSE4.2 if the length
> > + of A > 16. */
> > + if (a[16] != 0)
> > + return __strspn_sse2 (s, a);
> > }
> > + aligned = s;
> > + offset = (unsigned int) ((size_t) s & 15);
> >
> > - offset = (int) ((size_t) s & 15);
> > if (offset != 0)
> > {
> > + start_unaligned:
> > /* Check partial string. */
> > aligned = (const char *) ((size_t) s & -16L);
> > __m128i value = _mm_load_si128 ((__m128i *) aligned);
> > + __m128i adj_value = __m128i_shift_right (value, offset);
> >
> > - value = __m128i_shift_right (value, offset);
> > -
> > - int length = _mm_cmpistri (mask, value, 0x12);
> > + unsigned int length = _mm_cmpistri (mask, adj_value, 0x12);
> > /* No need to check CFlag since it is always 1. */
> > if (length < 16 - offset)
> > return length;
> > /* Find where the NULL terminator is. */
> > - int index = _mm_cmpistri (value, value, 0x3a);
> > - if (index < 16 - offset)
> > + maskz = _mm_cmpeq_epi8 (value, zero);
> > + maskz_bits = _mm_movemask_epi8 (maskz) >> offset;
> > + if (maskz_bits != 0)
> > return length;
> > aligned += 16;
> > }
> > - else
> > - aligned = s;
> >
> > +start_loop:
> > while (1)
> > {
> > __m128i value = _mm_load_si128 ((__m128i *) aligned);
> > - int index = _mm_cmpistri (mask, value, 0x12);
> > - int cflag = _mm_cmpistrc (mask, value, 0x12);
> > + unsigned int index = _mm_cmpistri (mask, value, 0x12);
> > + unsigned int cflag = _mm_cmpistrc (mask, value, 0x12);
> > if (cflag)
> > return (size_t) (aligned + index - s);
> > aligned += 16;
> > --
> > 2.25.1
> >
>
> LGTM.
>
> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
>
> Thanks.
>
> --
> H.J.
I would like to backport this patch to release branches.
Any comments or objections?
--Sunil
next prev parent reply other threads:[~2022-05-12 19:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220323215734.3927131-1-goldstein.w.n@gmail.com>
[not found] ` <20220323215734.3927131-3-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOqQHH-20_czF-vtb_L_6MRBer=H9g3XpNBQLzcoSLZj+A@mail.gmail.com>
[not found] ` <CAFUsyfKfR3haCneczj0=ji+u3X_RsMNCXuOadytBrcaxgoEVTg@mail.gmail.com>
[not found] ` <CAMe9rOqRGcLn3tvQSANaSydOM8RRQ2cY0PxBOHDu=iK88j=XUg@mail.gmail.com>
2022-05-12 19:31 ` [PATCH v1 03/23] x86: Code cleanup in strchr-avx2 and comment justifying branch Sunil Pandey
[not found] ` <20220323215734.3927131-4-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOraZjeAXy8GgdNqUb94y+0TUwbjWKJU7RixESgRYw1o7A@mail.gmail.com>
2022-05-12 19:32 ` [PATCH v1 04/23] x86: Code cleanup in strchr-evex " Sunil Pandey
[not found] ` <20220323215734.3927131-7-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOpSiZaO+mkq8OqwTHS__JgUD4LQQShMpjrgyGdZSPwUsA@mail.gmail.com>
2022-05-12 19:34 ` [PATCH v1 07/23] x86: Optimize strcspn and strpbrk in strcspn-c.c Sunil Pandey
[not found] ` <20220323215734.3927131-8-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOo7oks15kPUaZqd=Z1J1Xe==FJoECTNU5mBca9WTHgf1w@mail.gmail.com>
2022-05-12 19:39 ` Sunil Pandey [this message]
[not found] ` <20220323215734.3927131-9-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOrQ_zOdL-n-iiYpzLf+RxD_DBR51yEnGpRKB0zj4m31SQ@mail.gmail.com>
2022-05-12 19:40 ` [PATCH v1 09/23] x86: Remove strcspn-sse2.S and use the generic implementation Sunil Pandey
[not found] ` <20220323215734.3927131-10-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOqn8rZNfisVTmSKP9iWH1N26D--dncq1=MMgo-Hh-oR_Q@mail.gmail.com>
2022-05-12 19:41 ` [PATCH v1 10/23] x86: Remove strpbrk-sse2.S " Sunil Pandey
[not found] ` <20220323215734.3927131-11-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOp89e_1T9+i0W3=R3XR8DHp_Ua72x+poB6HQvE1q6b0MQ@mail.gmail.com>
2022-05-12 19:42 ` [PATCH v1 11/23] x86: Remove strspn-sse2.S " Sunil Pandey
[not found] ` <20220323215734.3927131-17-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOqkZtA9gE87TiqkHg+_rTZY4dqXO74_LykBwvihNO0YJA@mail.gmail.com>
2022-05-12 19:44 ` [PATCH v1 17/23] x86: Optimize str{n}casecmp TOLOWER logic in strcmp.S Sunil Pandey
[not found] ` <20220323215734.3927131-18-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOo-MzhNRiuyFhHpHKanbu50_OPr_Gaof9Yt16tJRwjYFA@mail.gmail.com>
2022-05-12 19:45 ` [PATCH v1 18/23] x86: Optimize str{n}casecmp TOLOWER logic in strcmp-sse42.S Sunil Pandey
[not found] ` <20220323215734.3927131-23-goldstein.w.n@gmail.com>
[not found] ` <CAMe9rOpzEL=V1OmUFJuScNetUc3mgMqYeqcqiD9aK+tBTN_sxQ@mail.gmail.com>
2022-05-12 19:54 ` [PATCH v1 23/23] x86: Remove AVX str{n}casecmp Sunil Pandey
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