Displaying 2 results from an estimated 2 matches for "_mm_srli_epi64".
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_mm_srli_epi16
2014 Jan 24
2
PATCH for lpc_intrin_sse41.c: faster shifts
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)
2014 Jan 30
0
PATCH for lpc_intrin_sse41.c: faster shifts
lvqcl wrote:
> 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)) -...