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Merged
ermig1979 merged 1 commit into from
Aug 20, 2026
Merged

Improve SVE2 optimizations of SimdSynetConvert32fTo8u #896

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1 change: 1 addition & 0 deletions docs/2026.html
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,7 @@ <h5>Improving</h5>
<li>SVE2 optimizations of function SobelDyAbs.</li>
<li>SVE2 optimizations of function SobelDyAbsSum.</li>
<li>SVE2 optimizations of function SegmentationChangeIndex.</li>
<li>SVE2 optimizations of function SynetConvert32fTo8u.</li>
</ul>
<h5>Renaming</h5>
<ul>
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61 changes: 48 additions & 13 deletions src/Simd/SimdSve2SynetConversion.cpp
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Expand Up @@ -115,26 +115,61 @@ namespace Simd
}
}

SIMD_INLINE svfloat32_t RepeatNhwc3(const svfloat32_t& table, uint32_t start, const svbool_t& mask)
{
svuint32_t index = svindex_u32(start, 1);
svuint32_t rem = svmls_n_u32_x(mask, index, svdiv_n_u32_x(mask, index, 3), 3);
return svreinterpret_f32_u32(svtbl_u32(svreinterpret_u32_f32(table), rem));
}

template <bool nofma> void SynetConvert32fTo8uNhwc3(const float* src, size_t batch, size_t spatial, const float* scale, const float* shift, int upper, uint8_t* dst)
{
const size_t F = svcntw();
const size_t F = svcntw(), DF = F * 2;
const svbool_t body = svptrue_b32();
const svuint32_t offsets = svmul_n_u32_x(body, svindex_u32(0, 1), 3);
svfloat32_t scale0 = svdup_n_f32(scale[0]), scale1 = svdup_n_f32(scale[1]), scale2 = svdup_n_f32(scale[2]);
svfloat32_t shift0 = svdup_n_f32(shift[0]), shift1 = svdup_n_f32(shift[1]), shift2 = svdup_n_f32(shift[2]);
const svbool_t channels = svwhilelt_b32((uint64_t)0, (uint64_t)3);
svfloat32_t scaleTbl = svld1_f32(channels, scale);
svfloat32_t shiftTbl = svld1_f32(channels, shift);
svfloat32_t scale0 = RepeatNhwc3(scaleTbl, 0, body);
svfloat32_t scale1 = RepeatNhwc3(scaleTbl, (uint32_t)F, body);
svfloat32_t scale2 = RepeatNhwc3(scaleTbl, (uint32_t)(F * 2), body);
svfloat32_t shift0 = RepeatNhwc3(shiftTbl, 0, body);
svfloat32_t shift1 = RepeatNhwc3(shiftTbl, (uint32_t)F, body);
svfloat32_t shift2 = RepeatNhwc3(shiftTbl, (uint32_t)(F * 2), body);
for (size_t b = 0; b < batch; ++b)
{
for (size_t s = 0; s < spatial; s += F)
size_t s = 0;
for (; s + DF <= spatial; s += DF)
{
svbool_t mask = svwhilelt_b32(s, spatial);
const float* ps = src + 3 * s;
uint8_t* pd = dst + 3 * s;
svst1b_scatter_u32offset_u32(mask, pd + 0, offsets, SynetConvert32fTo8u<nofma>(svld1_gather_u32index_f32(mask, ps + 0, offsets), scale0, shift0, upper, mask));
svst1b_scatter_u32offset_u32(mask, pd + 1, offsets, SynetConvert32fTo8u<nofma>(svld1_gather_u32index_f32(mask, ps + 1, offsets), scale1, shift1, upper, mask));
svst1b_scatter_u32offset_u32(mask, pd + 2, offsets, SynetConvert32fTo8u<nofma>(svld1_gather_u32index_f32(mask, ps + 2, offsets), scale2, shift2, upper, mask));
const float* ps = src + s * 3;
uint8_t* pd = dst + s * 3;
SynetConvert32fTo8u<nofma>(ps + 0 * F, scale0, shift0, upper, pd + 0 * F, body);
SynetConvert32fTo8u<nofma>(ps + 1 * F, scale1, shift1, upper, pd + 1 * F, body);
SynetConvert32fTo8u<nofma>(ps + 2 * F, scale2, shift2, upper, pd + 2 * F, body);
SynetConvert32fTo8u<nofma>(ps + 3 * F, scale0, shift0, upper, pd + 3 * F, body);
SynetConvert32fTo8u<nofma>(ps + 4 * F, scale1, shift1, upper, pd + 4 * F, body);
SynetConvert32fTo8u<nofma>(ps + 5 * F, scale2, shift2, upper, pd + 5 * F, body);
}
src += 3 * spatial;
dst += 3 * spatial;
for (; s + F <= spatial; s += F)
{
const float* ps = src + s * 3;
uint8_t* pd = dst + s * 3;
SynetConvert32fTo8u<nofma>(ps + 0 * F, scale0, shift0, upper, pd + 0 * F, body);
SynetConvert32fTo8u<nofma>(ps + 1 * F, scale1, shift1, upper, pd + 1 * F, body);
SynetConvert32fTo8u<nofma>(ps + 2 * F, scale2, shift2, upper, pd + 2 * F, body);
}
if (s < spatial)
{
size_t tail = (spatial - s) * 3;
const float* ps = src + s * 3;
uint8_t* pd = dst + s * 3;
SynetConvert32fTo8u<nofma>(ps + 0 * F, scale0, shift0, upper, pd + 0 * F, svwhilelt_b32((size_t)0, tail));
if (tail > F)
SynetConvert32fTo8u<nofma>(ps + 1 * F, scale1, shift1, upper, pd + 1 * F, svwhilelt_b32(F, tail));
if (tail > F * 2)
SynetConvert32fTo8u<nofma>(ps + 2 * F, scale2, shift2, upper, pd + 2 * F, svwhilelt_b32(F * 2, tail));
}
src += spatial * 3;
dst += spatial * 3;
}
}

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