Cosmetics to speed up finding sections of interest.

Originally committed as revision 11596 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/optimization.txt

 optimization Tips (for libavcodec):
+===================================
 
 What to optimize:
+-----------------
 If you plan to do non-x86 architecture specific optimizations (SIMD normally),
 then take a look in the i386/ directory, as most important functions are
 already optimized for MMX.
@@ -9,7 +11,9 @@ If you want to do x86 optimizations then you can either try to finetune the
 stuff in the i386 directory or find some other functions in the C source to
 optimize, but there aren't many left.
 
+
 Understanding these overoptimized functions:
+--------------------------------------------
 As many functions tend to be a bit difficult to understand because
 of optimizations, it can be hard to optimize them further, or write
 architecture-specific versions. It is recommened to look at older
@@ -23,7 +27,9 @@ and how they can be optimized.
 NOTE: If you still don't understand some function, ask at our mailing list!!!
 (http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel)
 
+
 What speedup justifies an optimizetion?
+---------------------------------------
 Normaly with clean&simple optimizations and widely used codecs a overall
 speedup of the affected codec of 0.1% is enough. These speedups accumulate
 and can make a big difference after a while ...
@@ -35,6 +41,7 @@ small and readable than to make it 1% faster.
 
 
 WTF is that function good for ....:
+-----------------------------------
 The primary purpose of that list is to avoid wasting time to optimize functions
 which are rarely used
 
@@ -145,9 +152,11 @@ The minimum guaranteed alignment is written in the .h files, for example:
 
 
 Links:
+======
 http://www.aggregate.org/MAGIC/
 
 x86-specific:
+-------------
 http://developer.intel.com/design/pentium4/manuals/248966.htm
 
 The IA-32 Intel Architecture Software Developer's Manual, Volume 2:
@@ -161,7 +170,7 @@ http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/22007.pd
 
 
 ARM-specific:
-
+-------------
 ARM Architecture Reference Manual (up to ARMv5TE):
 http://www.arm.com/community/university/eulaarmarm.html
 
@@ -176,7 +185,7 @@ Optimization guide for Intel XScale (used in Sharp Zaurus PDA):
 http://download.intel.com/design/intelxscale/27347302.pdf
 
 PowerPC-specific:
-
+-----------------
 PowerPC32/AltiVec PIM:
 www.freescale.com/files/32bit/doc/ref_manual/ALTIVECPEM.pdf
 
@@ -188,6 +197,7 @@ http://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/30B3520C93F437AB8725706
 http://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/9F820A5FFA3ECE8C8725716A0062585F/$file/CBE_Handbook_v1.1_24APR2007_pub.pdf
 
 SPARC-specific:
+---------------
 SPARC Joint Programming Specification (JPS1): Commonality
 http://www.fujitsu.com/downloads/PRMPWR/JPS1-R1.0.4-Common-pub.pdf
 
@@ -198,6 +208,7 @@ VIS Whitepaper (contains optimization guidelines)
 http://www.sun.com/processors/vis/download/vis/vis_whitepaper.pdf
 
 GCC asm links:
+--------------
 official doc but quite ugly
 http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html