MSVS profiler shows that the encoder spends too much time inside format_input() when the input is 24-bit. The attached patch increases encoding speed:
FLAC -5: from 27.1 to 24.2 seconds FLAC -8: from 76.2 to 73.1 seconds (MSVS 2010, 32-bit flac.exe, 24-bit stereo input file) For GCC compiles the encoding speed remains the same. I suspect that GCC is smart enough to use strict aliasing rule to optimize the code, and MSVS doesn't even know about it.
encode.patch
Description: Binary data
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