I wrote a patch that enables FLAC__BYTES_PER_WORD==8 in
libFLAC/bitreader.c and libFLAC\bitwriter.c.
The tests were done on an Intel Nehalem CPU, and flac was compiled
with CGG 4.9.x.
Average speed increase for FLAC__BYTES_PER_WORD change from 4 to 8:
Decoding speed:
ia32 architecture
16-bit .flac: -15%
24-bit .flac: -11%
x86-64 architecture
16-bit .flac: +3%
24-bit .flac: -0.6%
Encoding speed (only fastest presets (-0...-5) were tested):
ia32 architecture
16-bit .wav: +0.6%
24-bit .wav: +3%
x86-64 architecture
16-bit .wav: +6%
24-bit .wav: +7%
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