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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.
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