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rework AddVectorEq_SSE2

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Take advantage of the known sizes used by VP8LHistogramAdd() and
remove loop for the remainder. The loop was being auto-vectorized making
the code larger and slower than the vectorized C code.

For larger sizes the new code is ~3-4.5% faster than the old code with
about the same improvement against the vectorized C code. For the
minimal size (40), the new code is ~30% faster than the C and old SSE2
code.

The LINE_SIZE==8 option is removed with this change. It had been set
to 16 for its entire life and clang-16 was unrolling the LINE_SIZE==8
case by 2 in any case; they both profile similarly.

Change-Id: I6dfedfd57474f44d15e2ce510a48e5252221077a
This commit is contained in:
James Zern 2024-11-12 15:13:42 -08:00
parent 7bda3deb89
commit 61e2cfdadd
1 changed files with 30 additions and 12 deletions
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42
src/dsp/lossless_enc_sse2.c
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@ -224,35 +224,53 @@ static void AddVector_SSE2(const uint32_t* WEBP_RESTRICT a,
}
}
#define LINE_SIZE 16 // 8 or 16
static void AddVectorEq_SSE2(const uint32_t* WEBP_RESTRICT a,
uint32_t* WEBP_RESTRICT out, int size) {
int i;
for (i = 0; i + LINE_SIZE <= size; i += LINE_SIZE) {
int i = 0;
int aligned_size = size & ~15;
// Size is, at minimum, NUM_DISTANCE_CODES (40) and may be as large as
// NUM_LITERAL_CODES (256) + NUM_LENGTH_CODES (24) + (0 or a non-zero power of
// 2). See the usage in VP8LHistogramAdd().
assert(size >= 16);
assert(size % 2 == 0);
do {
const __m128i a0 = _mm_loadu_si128((const __m128i*)&a[i + 0]);
const __m128i a1 = _mm_loadu_si128((const __m128i*)&a[i + 4]);
#if (LINE_SIZE == 16)
const __m128i a2 = _mm_loadu_si128((const __m128i*)&a[i + 8]);
const __m128i a3 = _mm_loadu_si128((const __m128i*)&a[i + 12]);
#endif
const __m128i b0 = _mm_loadu_si128((const __m128i*)&out[i + 0]);
const __m128i b1 = _mm_loadu_si128((const __m128i*)&out[i + 4]);
#if (LINE_SIZE == 16)
const __m128i b2 = _mm_loadu_si128((const __m128i*)&out[i + 8]);
const __m128i b3 = _mm_loadu_si128((const __m128i*)&out[i + 12]);
#endif
_mm_storeu_si128((__m128i*)&out[i + 0], _mm_add_epi32(a0, b0));
_mm_storeu_si128((__m128i*)&out[i + 4], _mm_add_epi32(a1, b1));
#if (LINE_SIZE == 16)
_mm_storeu_si128((__m128i*)&out[i + 8], _mm_add_epi32(a2, b2));
_mm_storeu_si128((__m128i*)&out[i + 12], _mm_add_epi32(a3, b3));
#endif
i += 16;
} while (i != aligned_size);
if ((size & 8) != 0) {
const __m128i a0 = _mm_loadu_si128((const __m128i*)&a[i + 0]);
const __m128i a1 = _mm_loadu_si128((const __m128i*)&a[i + 4]);
const __m128i b0 = _mm_loadu_si128((const __m128i*)&out[i + 0]);
const __m128i b1 = _mm_loadu_si128((const __m128i*)&out[i + 4]);
_mm_storeu_si128((__m128i*)&out[i + 0], _mm_add_epi32(a0, b0));
_mm_storeu_si128((__m128i*)&out[i + 4], _mm_add_epi32(a1, b1));
i += 8;
}
for (; i < size; ++i) {
out[i] += a[i];
size &= 7;
if (size == 4) {
const __m128i a0 = _mm_loadu_si128((const __m128i*)&a[i]);
const __m128i b0 = _mm_loadu_si128((const __m128i*)&out[i]);
_mm_storeu_si128((__m128i*)&out[i], _mm_add_epi32(a0, b0));
} else if (size == 2) {
const __m128i a0 = _mm_loadl_epi64((const __m128i*)&a[i]);
const __m128i b0 = _mm_loadl_epi64((const __m128i*)&out[i]);
_mm_storel_epi64((__m128i*)&out[i], _mm_add_epi32(a0, b0));
}
}
#undef LINE_SIZE
//------------------------------------------------------------------------------
// Entropy