It turns out that int64 shift is quite slow...
This patch changes the code from:
(FLAC__int32)(xmm.m128i_i64[0] >> lp_quantization)
into:
_mm_cvtsi128_si32(_mm_srli_epi64(xmm, lp_quantization));
Encoding of 24-bit .wav files with 32-bit FLAC became noticeably faster.
The new code works only if quantization <= 32, but its max value is 15 so the
code always work.
(max_shiftlimit == (1 << (FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN-1)) - 1 == 15)
_______________________________________________
flac-dev mailing list
[email protected]
http://lists.xiph.org/mailman/listinfo/flac-dev
