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https://github.com/cuberite/libdeflate.git
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f2c3a5b4e9
* Bring in common headers and program code from xpack project * Move program code to programs/ * Move library code to lib/ * GNU89 and MSVC2010 compatibility * Other changes
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
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* matchfinder_sse2.h - matchfinding routines optimized for Intel SSE2
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* (Streaming SIMD Extensions).
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*/
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#include <emmintrin.h>
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static forceinline bool
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matchfinder_init_sse2(mf_pos_t *data, size_t size)
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{
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__m128i v, *p;
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size_t n;
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if (size % sizeof(__m128i) * 4)
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return false;
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STATIC_ASSERT(sizeof(mf_pos_t) == 2);
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v = _mm_set1_epi16(MATCHFINDER_INITVAL);
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p = (__m128i *)data;
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n = size / (sizeof(__m128i) * 4);
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do {
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p[0] = v;
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p[1] = v;
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p[2] = v;
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p[3] = v;
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p += 4;
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} while (--n);
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return true;
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}
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static forceinline bool
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matchfinder_rebase_sse2(mf_pos_t *data, size_t size)
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{
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__m128i v, *p;
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size_t n;
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if ((size % sizeof(__m128i) * 4 != 0))
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return false;
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STATIC_ASSERT(sizeof(mf_pos_t) == 2);
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v = _mm_set1_epi16((u16)-MATCHFINDER_WINDOW_SIZE);
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p = (__m128i *)data;
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n = size / (sizeof(__m128i) * 4);
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do {
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/* PADDSW: Add Packed Signed Integers With Signed Saturation */
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p[0] = _mm_adds_epi16(p[0], v);
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p[1] = _mm_adds_epi16(p[1], v);
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p[2] = _mm_adds_epi16(p[2], v);
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p[3] = _mm_adds_epi16(p[3], v);
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p += 4;
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} while (--n);
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return true;
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}
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