From df7764c32d037c1633ac39880ab62c9bf178f4a0 Mon Sep 17 00:00:00 2001 From: Ralf Corsepius Date: Fri, 18 Mar 2011 10:11:19 +0000 Subject: Import from zlib-1.2.4 --- cpukit/zlib/contrib/asm686/README.686 | 17 +++++++++++++++++ cpukit/zlib/contrib/asm686/match.S | 24 +++++++++++++++++++----- 2 files changed, 36 insertions(+), 5 deletions(-) (limited to 'cpukit/zlib') diff --git a/cpukit/zlib/contrib/asm686/README.686 b/cpukit/zlib/contrib/asm686/README.686 index a593f23afd..a0bf3bea4a 100644 --- a/cpukit/zlib/contrib/asm686/README.686 +++ b/cpukit/zlib/contrib/asm686/README.686 @@ -32,3 +32,20 @@ then do: CFLAGS="-O3 -DASMV" ./configure make OBJA=match.o + + +Update: + +I've been ignoring these assembly routines for years, believing that +gcc's generated code had caught up with it sometime around gcc 2.95 +and the major rearchitecting of the Pentium 4. However, I recently +learned that, despite what I believed, this code still has some life +in it. On the Pentium 4 and AMD64 chips, it continues to run about 8% +faster than the code produced by gcc 4.1. + +In acknowledgement of its continuing usefulness, I've altered the +license to match that of the rest of zlib. Share and Enjoy! + +Brian Raiter +breadbox@muppetlabs.com +April, 2007 diff --git a/cpukit/zlib/contrib/asm686/match.S b/cpukit/zlib/contrib/asm686/match.S index 5c3e9ee367..06817e1dd0 100644 --- a/cpukit/zlib/contrib/asm686/match.S +++ b/cpukit/zlib/contrib/asm686/match.S @@ -1,9 +1,23 @@ -/* match.s -- Pentium-Pro-optimized version of longest_match() - * Written for zlib 1.1.2 - * Copyright (C) 1998 Brian Raiter +/* match.S -- x86 assembly version of the zlib longest_match() function. + * Optimized for the Intel 686 chips (PPro and later). * - * This is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License. + * Copyright (C) 1998, 2007 Brian Raiter + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the author be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. */ #ifndef NO_UNDERLINE -- cgit v1.2.3