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authorParménides GV <parmegv@sdf.org>2014-04-09 16:03:55 +0200
committerParménides GV <parmegv@sdf.org>2014-04-09 16:07:34 +0200
commit1684c8f398922065a97e7da4dac4ac6a33cc5218 (patch)
tree76a4b11ae0d7b217c088f3c2b8fc7e69a7b8ae0d /app/lzo/asm/i386/00README.TXT
parentb9a2b085a8f508cd09e2639c70be845c992c4a3e (diff)
Back to the standard "app" module.
This return to "app" instead of "bitmask_android" is due to this reading: https://developer.android.com/sdk/installing/studio-build.html#projectStructure I'll have to tweak the final apk name in build.gradle.
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+
+Directory overview:
+===================
+
+As writing portable assembler sources supporting different operating
+systems, compilers and assemblers has proven to be extremely painful,
+the assembler sources have been converted into a more portable 'db'
+format. Use these whenever possible.
+
+ src_gas sources converted for portable gcc/gas syntax
+ src_masm sources converted for portable masm/tasm/wasm syntax
+ src_nasm sources converted for portable nasm syntax
+
+ src assembler sources (you need the OpenSource nasm assembler)
+
+ obj pre-assembled object files
+
+Also look 'src_XXX/all/asm_all.asm' which contains all assembler
+functions conveniently arranged into a single file.
+
+
+Notes:
+======
+
+- The assembler sources are designed for a flat 32-bit memory model
+ running in protected mode - they should work with all i386
+ 32-bit compilers around.
+
+- All functions expect a 'cdecl' (C stack based) calling convention.
+ The function return value will be placed into 'eax'.
+ All other registers are preserved.
+
+- Prototypes for the assembler functions can be found in <lzo/lzo_asm.h>.
+
+- For reasons of speed all fast assembler decompressors (having '_fast'
+ in their name) can access (write to) up to 3 bytes past the end of
+ the decompressed (output) block. Data past the end of the compressed
+ (input) block is never accessed (read from).
+ [ technical note: because data is transferred in 32-bit units ]
+
+- Finally you should test if the assembler versions are actually faster
+ than the C version on your machine - some compilers can do a very good
+ optimization job, and they also can optimize the code for a specific
+ processor type.
+