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Fix sparse mask handling in softmax kernel #33814

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Merged
maxnick merged 4 commits into from
Feb 4, 2026
Merged

Fix sparse mask handling in softmax kernel #33814

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5ae6469
Fix sparse mask handling in softmax kernel
mangguo321 Jan 26, 2026
cdd68e6
Add softmax kernel unit test with sparse mask
mangguo321 Jan 30, 2026
2bcf7f8
Fix typo
mangguo321 Jan 30, 2026
6301843
Skip the test on non-x86_64 platforms as xattention is supported only…
mangguo321 Feb 1, 2026
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39 changes: 24 additions & 15 deletions src/plugins/intel_cpu/src/nodes/kernels/scaled_attn/softmax_kernel.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -318,8 +318,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) { \
size_t mask_idx = (i + n * vec_len_f32_avx512) / sparse_block_size; \
uint8_t mask_val = sparse_mask[mask_idx]; \
__m512 v_mask_block = _mm512_set1_ps(mask_val ? 0.f : -FLT_MAX); \
v_a = _mm512_add_ps(v_a, v_mask_block); \
if (!mask_val) { \
v_a = v_nfltmax; \
} \
} \
if (has_causal_mask) { \
auto v_maski8 = \
Expand Down Expand Up @@ -355,8 +356,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) {
size_t mask_idx = i / sparse_block_size;
uint8_t mask_val = sparse_mask[mask_idx];
__m512 v_mask_block = _mm512_set1_ps(mask_val ? 0.f : -FLT_MAX);
v_a = _mm512_add_ps(v_a, v_mask_block);
if (!mask_val) {
v_a = v_nfltmax;
}
}

if (has_causal_mask) {
Expand Down Expand Up @@ -390,8 +392,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) {
size_t mask_idx = i / sparse_block_size;
uint8_t mask_val = sparse_mask[mask_idx];
__m512 v_mask_block = _mm512_set1_ps(mask_val ? 0.f : -FLT_MAX);
v_a = _mm512_add_ps(v_a, v_mask_block);
if (!mask_val) {
v_a = v_nfltmax;
}
}

if (has_causal_mask) {
Expand Down Expand Up @@ -439,8 +442,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) { \
size_t mask_idx = (i + n * vec_len_f32_avx2) / sparse_block_size; \
uint8_t mask_val = sparse_mask[mask_idx]; \
__m256 v_mask_block = _mm256_set1_ps(mask_val ? 0.f : -FLT_MAX); \
v_a = _mm256_add_ps(v_a, v_mask_block); \
if (!mask_val) { \
v_a = v_nfltmax; \
} \
} \
if (has_causal_mask) { \
auto v_maski8 = _mm_loadu_si128(reinterpret_cast<__m128i const*>(causal_mask + i + n * vec_len_f32_avx2)); \
Expand Down Expand Up @@ -476,8 +480,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) {
size_t mask_idx = i / sparse_block_size;
uint8_t mask_val = sparse_mask[mask_idx];
__m256 v_mask_block = _mm256_set1_ps(mask_val ? 0.f : -FLT_MAX);
v_a = _mm256_add_ps(v_a, v_mask_block);
if (!mask_val) {
v_a = v_nfltmax;
}
}

if (has_causal_mask) {
Expand Down Expand Up @@ -512,8 +517,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) {
size_t mask_idx = i / sparse_block_size;
uint8_t mask_val = sparse_mask[mask_idx];
__m256 v_mask_block = _mm256_set1_ps(mask_val ? 0.f : -FLT_MAX);
v_a = _mm256_add_ps(v_a, v_mask_block);
if (!mask_val) {
v_a = v_nfltmax;
}
}

if (has_causal_mask) {
Expand Down Expand Up @@ -560,8 +566,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) {
size_t mask_idx = i / sparse_block_size;
uint8_t mask_val = sparse_mask[mask_idx];
float32x4_t v_mask_block = vdupq_n_f32(mask_val ? 0.0F : -FLT_MAX);
v_a = vaddq_f32(v_a, v_mask_block);
if (!mask_val) {
v_a = v_nfltmax;
}
}

if (has_causal_mask) {
Expand Down Expand Up @@ -596,7 +603,9 @@ inline void scale_add2_reduce_max(float* a,
if (has_sparse_mask) {
size_t mask_idx = i / sparse_block_size;
uint8_t mask_val = sparse_mask[mask_idx];
a[i] += (mask_val ? 0.0F : -FLT_MAX);
if (!mask_val) {
a[i] = -FLT_MAX;
}
}

if (has_causal_mask) {
Expand Down
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