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fix #829: 兼容Intel Cascade Lake架构的CPU

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liu.shen 2025-03-09 19:26:12 +08:00
parent 407e1b9ab2
commit 26bd889ff8
1 changed files with 23 additions and 2 deletions
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25
third_party/llamafile/iqk_mul_mat.inc vendored
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@ -2385,7 +2385,12 @@ struct SimpleBits {
__m256i values[4];
};
// fix for #829: 添加对 AVX512VPOPCNTDQ 的检测
#if defined(HAVE_FANCY_SIMD) && defined(__AVX512VPOPCNTDQ__)
#define HAVE_AVX512_POPCNT 1
#else
#define HAVE_AVX512_POPCNT 0
#endif
struct EvenSignHelper {
#if defined HAVE_FANCY_SIMD
@ -2396,7 +2401,23 @@ struct EvenSignHelper {
};
IQK_ALWAYS_INLINE void sign_2_values(__m256i aux, __m256i * values) const {
aux = _mm256_and_si256(_mm256_srlv_epi32(aux, shifts), mask);
auto pcnt = _mm256_popcnt_epi32(aux);
// fix for #829: 兼容Intel Cascade Lake架构的CPU，如果不支持AVX512VPOPCNTDQ扩展，则使用替代实现
#if HAVE_AVX512_POPCNT
auto pcnt = _mm256_popcnt_epi32(aux);
#else
// 提供替代实现，使用标准的位计数方法
__m256i pcnt;
int* pcnt_ptr = reinterpret_cast<int*>(&pcnt);
int* aux_ptr = reinterpret_cast<int*>(&aux); // 直接获取 aux 的地址，避免不必要的复制
#pragma unroll 8 // 提示编译器展开循环，提高 SIMD 计算吞吐量
for (int i = 0; i < 8; i++) {
pcnt_ptr[i] = __builtin_popcount(aux_ptr[i]); // 使用编译器内置 popcount
}
#endif
sbits_t sbits;
sbits.vec = _mm256_cvtepi32_epi8(_mm256_or_si256(aux, _mm256_slli_epi32(_mm256_and_si256(pcnt, mone), 7)));
values[0] = _mm256_mask_sub_epi8(values[0], sbits.mask[0], _mm256_setzero_si256(), values[0]);