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List: cairo-bugs
Subject: [cairo-bugs] [Bug 16128] New: optimize swap functions/speed
From: bugzilla-daemon () freedesktop ! org
Date: 2008-05-28 15:32:45
Message-ID: bug-16128-4039 () http ! bugs ! freedesktop ! org/
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http://bugs.freedesktop.org/show_bug.cgi?id=16128
Summary: optimize swap functions/speed improvement possible
Product: cairo
Version: 1.6.4
Platform: All
OS/Version: All
Status: RESOLVED
Severity: enhancement
Priority: medium
Component: xlib backend
AssignedTo: cworth@cworth.org
ReportedBy: charlet@adacore.com
QAContact: cairo-bugs@cairographics.org
Behdad Esfahbod <freedesktop@behdad.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
In cairo-xlib-surface.c, it should be possible to get a 2x to 4x speed
improvement
for _swap_ximage_[24]bytes by using facilities provided in <byteswap.h> (under
glibc systems), or by using recent GCC's builtin __builtin_bswap32.
Arno
--- Comment #1 from Arnaud Charlet <charlet@adacore.com> 2008-05-28 02:06:37 PST ---
Created an attachment (id=16783)
--> (http://bugs.freedesktop.org/attachment.cgi?id=16783)
test program with various byteswap implementations
The test program itself is too simple minded, but this attachment shows
several possible implementations of byteswapping which can be of interest.
$ gcc -O2 byteswap.c -o byteswap
$ ./byteswap
UINT32_GCC_SWAP
time spent: 1114
cairo code
time spent: 2247
UINT32_SWAP
time spent: 2225
UINT32_GLIBC_SWAP
time spent: 747
--- Comment #2 from Behdad Esfahbod <freedesktop@behdad.org> 2008-05-28 08:32:43 PST ---
commit 5de0650dbbed7a44789f25b0a5226593931a8ce8
Author: Behdad Esfahbod <behdad@behdad.org>
Date: Wed May 28 10:43:47 2008 -0400
[cairo-xlib] Add recently-added byteswap macros (#16128)
commit dd8f3a5690e92ac3421e5bbc475cc3e78865d8ef
Author: Behdad Esfahbod <behdad@behdad.org>
Date: Wed May 28 10:43:22 2008 -0400
Add support for byteswap macros bswap_16 and bswap_32
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