From: Artur Skawina <art.08.09@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicolas Pitre <nico@cam.org>,
Git Mailing List <git@vger.kernel.org>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: block-sha1: improve code on large-register-set machines
Date: Wed, 12 Aug 2009 01:45:52 +0200 [thread overview]
Message-ID: <4A8202B0.9080608@gmail.com> (raw)
In-Reply-To: <alpine.LFD.2.01.0908111550470.28882@localhost.localdomain>
Linus Torvalds wrote:
>
> One thing that strikes me is that I've been just testing with gcc-4.4, and
> BenH (who did some tests on PPC where SHA1 is just _trivial_ because it
> all fits in the normal register space) noticed that older versions of gcc
> that he tested did much worse on this.
>
> I think Artur also posted (x86) numbers with older gcc versions doing
> worse. Maybe you're seeing some of that?
FWIW, this is how it looks here. On 32-bit x86 gcc4.4 makes a large
difference[1], but your code does fairly well w/ most gccs, relatively
to all the other C implementations.
artur
P4: [linusv is the recent one w/ the volatile stores]
### sha1bench-gcc295: GCCVER 2.95.4 20030502 (prerelease)
rfc3174 0.9438 64.67
linus 0.9081 67.21
linusv 0.4155 146.9
linusp4 0.8761 69.66
linusas 0.9619 63.45
linusas2 1.025 59.52
mozilla 1.314 46.46
mozillaas 1.132 53.92
### sha1bench-gcc31: GCCVER 3.2 2002-07-26 (prerelease)
rfc3174 0.8582 71.12
linus 0.7943 76.84
linusv 0.5667 107.7
linusp4 0.7224 84.48
linusas 0.7127 85.64
linusas2 0.5109 119.5
mozilla 1.251 48.79
mozillaas 1.239 49.27
### sha1bench-gcc32: GCCVER 3.2.3
rfc3174 0.9062 67.35
linus 0.5555 109.9
linusv 0.3647 167.4
linusp4 0.5337 114.4
linusas 0.7126 85.66
linusas2 0.5089 119.9
mozilla 1.138 53.64
mozillaas 1.075 56.78
### sha1bench-gcc33: GCCVER 3.3.6
rfc3174 0.9029 67.6
linus 0.6059 100.7
linusv 0.3734 163.4
linusp4 0.6695 91.16
linusas 0.7832 77.93
linusas2 0.571 106.9
mozilla 1.083 56.36
mozillaas 1.078 56.62
### sha1bench-gcc34: GCCVER 3.4.6 20060121 (prerelease)
rfc3174 0.9277 65.79
linus 0.6583 92.71
linusv 0.6096 100.1
linusp4 0.7326 83.31
linusas 0.7383 82.67
linusas2 0.6264 97.44
mozilla 1.398 43.67
mozillaas 1.392 43.84
### sha1bench-gcc40: GCCVER 4.0.4 20061113 (prerelease)
rfc3174 0.9889 61.72
linus 0.7508 81.29
linusv 0.7752 78.73
linusp4 0.6548 93.21
linusas 0.4904 124.5
linusas2 0.6378 95.7
mozilla 1.528 39.93
mozillaas 1.596 38.24
### sha1bench-gcc41: GCCVER 4.1.3 20080704 (prerelease)
rfc3174 0.9798 62.29
linus 0.6993 87.28
linusv 0.767 79.57
linusp4 0.6785 89.95
linusas 0.6555 93.11
linusas2 0.691 88.32
mozilla 1.594 38.3
mozillaas 1.566 38.98
### sha1bench-gcc42: GCCVER 4.2.5 20090330 (prerelease)
rfc3174 1.138 53.63
linus 0.7772 78.53
linusv 0.6138 99.43
linusp4 0.7018 86.97
linusas 0.8164 74.76
linusas2 0.7038 86.73
mozilla 1.697 35.97
mozillaas 1.491 40.94
### sha1bench-gcc43: GCCVER 4.3.5 20090810 (prerelease)
rfc3174 1.148 53.15
linus 0.7085 86.14
linusv 0.5474 111.5
linusp4 0.5399 113
linusas 0.7522 81.14
linusas2 0.5341 114.3
mozilla 1.723 35.43
mozillaas 1.502 40.64
### sha1bench-gcc44: GCCVER 4.4.2 20090809 (prerelease)
rfc3174 1.451 42.06
linus 0.5871 104
linusv 0.3713 164.4
linusp4 0.4367 139.8
linusas 0.4083 149.5
linusas2 0.4372 139.6
mozilla 1.104 55.27
mozillaas 1.314 46.44
And on Atom:
### sha1bench-gcc295: GCCVER 2.95.4 20030502 (prerelease)
rfc3174 1.905 32.04
linus 1.089 56.06
linusv 0.8134 75.04
linusp4 1.086 56.19
linusas 1.009 60.52
linusas2 1.255 48.63
mozilla 2.663 22.92
### sha1bench-gcc31: GCCVER 3.2 2002-07-26 (prerelease)
rfc3174 2.141 28.51
linus 1.022 59.75
linusv 0.8323 73.34
linusp4 1.061 57.54
linusas 0.9889 61.72
linusas2 0.9204 66.32
mozilla 2.573 23.72
### sha1bench-gcc32: GCCVER 3.2.3
rfc3174 2.155 28.32
linus 0.9031 67.58
linusv 0.7849 77.76
linusp4 0.847 72.06
linusas 0.9888 61.73
linusas2 0.912 66.93
mozilla 2.485 24.56
### sha1bench-gcc33: GCCVER 3.3.6
rfc3174 2.178 28.02
linus 0.9489 64.32
linusv 0.8642 70.63
linusp4 0.8784 69.48
linusas 1.017 60.03
linusas2 0.906 67.37
mozilla 2.541 24.02
### sha1bench-gcc34: GCCVER 3.4.6 20060121 (prerelease)
rfc3174 2.157 28.3
linus 0.9481 64.37
linusv 0.8383 72.8
linusp4 0.965 63.25
linusas 0.9852 61.95
linusas2 0.9809 62.22
mozilla 3.143 19.42
### sha1bench-gcc40: GCCVER 4.0.4 20061113 (prerelease)
rfc3174 2.088 29.24
linus 0.9706 62.89
linusv 0.928 65.77
linusp4 1.003 60.85
linusas 0.9478 64.4
linusas2 0.9475 64.42
mozilla 2.742 22.26
### sha1bench-gcc41: GCCVER 4.1.3 20080704 (prerelease)
rfc3174 2.047 29.81
linus 0.9778 62.42
linusv 1.051 58.06
linusp4 1.062 57.46
linusas 1.052 58.01
linusas2 1.069 57.12
mozilla 2.6 23.47
### sha1bench-gcc42: GCCVER 4.2.5 20090330 (prerelease)
rfc3174 2.025 30.14
linus 0.9622 63.43
linusv 0.7984 76.44
linusp4 0.8967 68.07
linusas 1.018 59.94
linusas2 0.9048 67.46
mozilla 2.748 22.21
### sha1bench-gcc43: GCCVER 4.3.5 20090810 (prerelease)
rfc3174 2.043 29.88
linus 0.9436 64.69
linusv 0.8532 71.54
linusp4 0.8531 71.54
linusas 1.04 58.71
linusas2 0.8495 71.85
mozilla 2.678 22.79
### sha1bench-gcc44: GCCVER 4.4.2 20090809 (prerelease)
rfc3174 2.119 28.8
linus 0.9132 66.84
linusv 0.8632 70.71
linusp4 0.9842 62.02
linusas 1.027 59.45
linusas2 0.9844 62
mozilla 2.214 27.57
prev parent reply other threads:[~2009-08-11 23:46 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-10 23:52 block-sha1: improve code on large-register-set machines Linus Torvalds
2009-08-11 6:15 ` Nicolas Pitre
2009-08-11 15:04 ` Linus Torvalds
2009-08-11 18:00 ` Nicolas Pitre
2009-08-11 19:31 ` Nicolas Pitre
2009-08-11 21:20 ` Brandon Casey
2009-08-11 21:36 ` Nicolas Pitre
2009-08-11 21:49 ` Brandon Casey
2009-08-11 22:57 ` Linus Torvalds
2009-08-11 23:13 ` Brandon Casey
2009-08-11 15:43 ` Linus Torvalds
2009-08-11 20:03 ` Nicolas Pitre
2009-08-11 22:53 ` Linus Torvalds
2009-08-11 23:14 ` Linus Torvalds
2009-08-12 2:26 ` Nicolas Pitre
2009-08-11 23:45 ` Artur Skawina [this message]
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