Skip to content

Improve SVE2 optimizations of SimdSynetConvert8uTo32f #897

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

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

Improve SVE2 optimizations of SimdSynetConvert8uTo32f #897

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions docs/2026.html
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,7 @@ <h5>Improving</h5>
<li>SVE2 optimizations of function SobelDyAbsSum.</li>
<li>SVE2 optimizations of function SegmentationChangeIndex.</li>
<li>SVE2 optimizations of function SynetConvert32fTo8u.</li>
<li>SVE2 optimizations of function SynetConvert8uTo32f.</li>
</ul>
<h5>Renaming</h5>
<ul>
Expand Down
61 changes: 41 additions & 20 deletions src/Simd/SimdSve2SynetConversion.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -268,33 +268,54 @@ namespace Simd
}
}

template <bool nofma> SIMD_INLINE void SynetConvert8uTo32fNhwc3(const uint8_t* src, const svfloat32_t& scale, const svfloat32_t& shift, float* dst, const svuint32_t& srcOffsets, const svuint32_t& dstOffsets, const svbool_t& mask)
{
svfloat32_t f32 = svcvt_f32_u32_x(mask, svld1ub_gather_u32offset_u32(mask, src, srcOffsets));
svst1_scatter_u32offset_f32(mask, dst, dstOffsets, Fmadd<nofma>(f32, scale, shift, mask));
}

template <bool nofma> void SynetConvert8uTo32fNhwc3(const uint8_t* src, size_t batch, size_t spatial, const float* scale, const float* shift, float* dst)
{
const size_t F = svcntw();
const size_t F = svcntw(), DF = F * 2;
const svbool_t body = svptrue_b32();
const svuint32_t srcOffsets = svmul_n_u32_x(body, svindex_u32(0, 1), 3);
const svuint32_t dstOffsets = svmul_n_u32_x(body, svindex_u32(0, 1), 3 * sizeof(float));
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 uint8_t* ps = src + 3 * s;
float* pd = dst + 3 * s;
SynetConvert8uTo32fNhwc3<nofma>(ps + 0, scale0, shift0, pd + 0, srcOffsets, dstOffsets, mask);
SynetConvert8uTo32fNhwc3<nofma>(ps + 1, scale1, shift1, pd + 1, srcOffsets, dstOffsets, mask);
SynetConvert8uTo32fNhwc3<nofma>(ps + 2, scale2, shift2, pd + 2, srcOffsets, dstOffsets, mask);
const uint8_t* ps = src + s * 3;
float* pd = dst + s * 3;
SynetConvert8uTo32f<nofma>(ps + 0 * F, scale0, shift0, pd + 0 * F, body);
SynetConvert8uTo32f<nofma>(ps + 1 * F, scale1, shift1, pd + 1 * F, body);
SynetConvert8uTo32f<nofma>(ps + 2 * F, scale2, shift2, pd + 2 * F, body);
SynetConvert8uTo32f<nofma>(ps + 3 * F, scale0, shift0, pd + 3 * F, body);
SynetConvert8uTo32f<nofma>(ps + 4 * F, scale1, shift1, pd + 4 * F, body);
SynetConvert8uTo32f<nofma>(ps + 5 * F, scale2, shift2, pd + 5 * F, body);
}
src += 3 * spatial;
dst += 3 * spatial;
for (; s + F <= spatial; s += F)
{
const uint8_t* ps = src + s * 3;
float* pd = dst + s * 3;
SynetConvert8uTo32f<nofma>(ps + 0 * F, scale0, shift0, pd + 0 * F, body);
SynetConvert8uTo32f<nofma>(ps + 1 * F, scale1, shift1, pd + 1 * F, body);
SynetConvert8uTo32f<nofma>(ps + 2 * F, scale2, shift2, pd + 2 * F, body);
}
if (s < spatial)
{
size_t tail = (spatial - s) * 3;
const uint8_t* ps = src + s * 3;
float* pd = dst + s * 3;
SynetConvert8uTo32f<nofma>(ps + 0 * F, scale0, shift0, pd + 0 * F, svwhilelt_b32((size_t)0, tail));
if (tail > F)
SynetConvert8uTo32f<nofma>(ps + 1 * F, scale1, shift1, pd + 1 * F, svwhilelt_b32(F, tail));
if (tail > F * 2)
SynetConvert8uTo32f<nofma>(ps + 2 * F, scale2, shift2, pd + 2 * F, svwhilelt_b32(F * 2, tail));
}
src += spatial * 3;
dst += spatial * 3;
}
}

Expand Down