SHAOS » altivec https://shaos.net/blog { Personal Blog of Shaos } Mon, 04 Aug 2025 00:15:41 +0000 en-US hourly 1 http://wordpress.org/?v=3.9.1 Black big-endian and little-endian https://shaos.net/blog/2009/08/black-big-endian-and-little-endian.html https://shaos.net/blog/2009/08/black-big-endian-and-little-endian.html#comments Fri, 21 Aug 2009 04:52:00 +0000 http://shaos.net/blog4/?p=37 This is my home working place where I can port software from little-endian machine to big-endian:

Red table bought in IKEA. Right-bottom: Systemax server with Intel Core 2 Duo 2.6 ГГц (Slackware 12.2). Right-top: PowerMac G4 Cube (colored to black) with Debian 5.0 and preloaded libfreevec. Left-bottom: subwoofer Logitech, power adapter for Cube and Gigabit switch. Left-top: UPS CyberPower 1500AVR. In the center under the table: KVM IOGEAR (switching USB keyboard+mouse and VGA between both machines). In the center on the table: display SAMSUNG SyncMaster 204B (20.5′ with ratio 4:3), Logitech audio speakers and microphone RadioShack. Also you can see black “Das Keyboard” that doesn’t have any characters on it ;)

]]> https://shaos.net/blog/2009/08/black-big-endian-and-little-endian.html/feed 0 Vectorized memcpy on G4 Cube https://shaos.net/blog/2009/03/vectorized-memcpy-on-g4-cube.html https://shaos.net/blog/2009/03/vectorized-memcpy-on-g4-cube.html#comments Tue, 03 Mar 2009 00:41:00 +0000 http://shaos.net/blog4/?p=32 Again I tested new hardware using my memcpy benchmark – now for my 1st desktop on Intel Core 2 Duo 2.6 GHz and my 2nd desktop on PowerPC G4 450 MHz (black G4 Cube). Here you can see not-aligned (nal) and aligned (al) results and also “vectorized” results (G4-450v-nal and G4-450v-al) where memcpy was AltiVec optimized version from libfreevec v1.0.4.

P.S. If you want optimized AltiVec versions of such functions as bmove512, memccpy, memchr, memcmp, memcpy, memfrob, memmove, mempcpy, memrchr, memset, strcmp, strcpy, strlen, strncmp, strncpy, strnlen and swab for everything in your Linux system, then just put (of course after successful libfreevec installation) line /usr/local/lib/libfreevec_libc.so to file /etc/ld.so.preload (you can create this file if it’s not yet available) – thanks to Konstantinos Margaritis (author of libfreevec)!

]]> https://shaos.net/blog/2009/03/vectorized-memcpy-on-g4-cube.html/feed 0 Vectorized memcpy https://shaos.net/blog/2008/04/vectorized-memcpy.html https://shaos.net/blog/2008/04/vectorized-memcpy.html#comments Tue, 29 Apr 2008 11:28:00 +0000 http://shaos.net/blog4/?p=18 Some benchmarks of memcpy function on my Compaq Presario S6000NX Celeron 2.7 GHz (Linux), PowerMac G4 400 MHz (Linux) and PowerBook G4 1.67 GHz (Linux and Mac OS X):

As we can see vectorized memcpy on PowerPC G4 1.67 GHz almost twice as fast as Celeron 2.7 GHz (which is sometimes similar to speed of vectorized memcpy on PowerPC G4 400 MHz). Also we see that Mac OS X has vectorized memcpy by default. See source code of this test: files/test_g4.c (2.5K)

]]> https://shaos.net/blog/2008/04/vectorized-memcpy.html/feed 0 Full results for benchsuite on G4 1.67 GHz https://shaos.net/blog/2008/04/full-results-for-benchsuite-on-g4-1-67-ghz.html https://shaos.net/blog/2008/04/full-results-for-benchsuite-on-g4-1-67-ghz.html#comments Tue, 29 Apr 2008 00:49:00 +0000 http://shaos.net/blog4/?p=17 Full run of SVN version of freevec‘s benchsuite takes more than two days on my PowerBook G4 1.67 GHz. This is archive with sqlite DB and SQL: files/g4_1670_080428.zip

]]> https://shaos.net/blog/2008/04/full-results-for-benchsuite-on-g4-1-67-ghz.html/feed 0 Some vectorization for my PowerMac G4 https://shaos.net/blog/2008/04/some-vectorization-for-my-powermac-g4.html https://shaos.net/blog/2008/04/some-vectorization-for-my-powermac-g4.html#comments Sat, 26 Apr 2008 23:19:00 +0000 http://shaos.net/blog4/?p=16 Another test of libfreevec-1.0.3 under the same Debian 4.0 “etch” as at previous time, but now on my PowerMac G4 400 MHz:





Archive with original data files: files/g4_400_tests_080426.zip

]]> https://shaos.net/blog/2008/04/some-vectorization-for-my-powermac-g4.html/feed 0 Some vectorization for my PowerBook G4 https://shaos.net/blog/2008/04/some-vectorization-for-my-powerbook-g4.html https://shaos.net/blog/2008/04/some-vectorization-for-my-powerbook-g4.html#comments Sat, 26 Apr 2008 15:29:00 +0000 http://shaos.net/blog4/?p=15 Some benchmarks of libfreevec-1.0.3 on my PowerBook G4 1.67 GHz under Debian 4.0 “etch”. Tests were prepared by benchsuite-1.0.2 with little help from OpenOffice.org Calc. Thanks to Konstantinos Margaritis for excellent work!






Archive with original data files: files/g4_1670_tests_080425.zip

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