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| author | Jingning Han <jingning@google.com> | 2013-06-21 15:56:24 -0700 |
|---|---|---|
| committer | Jingning Han <jingning@google.com> | 2013-06-25 12:02:26 -0700 |
| commit | 0084e61d5f935e763c29a49094377d4ab64577e5 (patch) | |
| tree | 44065ee93c4abb121fecccecb0dad8b7b0530238 /vp9/encoder | |
| parent | cd6932db770b7fe53f668bed8794e5d548745e38 (diff) | |
| download | libvpx-0084e61d5f935e763c29a49094377d4ab64577e5.tar libvpx-0084e61d5f935e763c29a49094377d4ab64577e5.tar.gz libvpx-0084e61d5f935e763c29a49094377d4ab64577e5.tar.bz2 libvpx-0084e61d5f935e763c29a49094377d4ab64577e5.zip | |
Tune the rounding operations in 8x8 ADST/DCT sse2
Improve the round-trip precision to meet the unit test setttings.
Change-Id: I303febae56b4b990ea3798b8ebed94c0510ecf79
Diffstat (limited to 'vp9/encoder')
| -rw-r--r-- | vp9/encoder/x86/vp9_dct_sse2.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/vp9/encoder/x86/vp9_dct_sse2.c b/vp9/encoder/x86/vp9_dct_sse2.c index f11200f62..484afce73 100644 --- a/vp9/encoder/x86/vp9_dct_sse2.c +++ b/vp9/encoder/x86/vp9_dct_sse2.c @@ -397,6 +397,24 @@ static INLINE void load_buffer_8x8(int16_t *input, __m128i in[8], int stride) { // write 8x8 array static INLINE void write_buffer_8x8(int16_t *output, __m128i res[8]) { + __m128i sign0 = _mm_srai_epi16(res[0], 15); + __m128i sign1 = _mm_srai_epi16(res[1], 15); + __m128i sign2 = _mm_srai_epi16(res[2], 15); + __m128i sign3 = _mm_srai_epi16(res[3], 15); + __m128i sign4 = _mm_srai_epi16(res[4], 15); + __m128i sign5 = _mm_srai_epi16(res[5], 15); + __m128i sign6 = _mm_srai_epi16(res[6], 15); + __m128i sign7 = _mm_srai_epi16(res[7], 15); + + res[0] = _mm_sub_epi16(res[0], sign0); + res[1] = _mm_sub_epi16(res[1], sign1); + res[2] = _mm_sub_epi16(res[2], sign2); + res[3] = _mm_sub_epi16(res[3], sign3); + res[4] = _mm_sub_epi16(res[4], sign4); + res[5] = _mm_sub_epi16(res[5], sign5); + res[6] = _mm_sub_epi16(res[6], sign6); + res[7] = _mm_sub_epi16(res[7], sign7); + res[0] = _mm_srai_epi16(res[0], 1); res[1] = _mm_srai_epi16(res[1], 1); res[2] = _mm_srai_epi16(res[2], 1); |