81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* need a new enough GCC for avx512 support */
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#if (( defined(__GNUC__) && __GNUC__ > 6 && defined(__AVX512CD__)) || (defined(__clang__) && __clang_major__ >= 9))
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#define HAVE_DASUM_KERNEL 1
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#include <immintrin.h>
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#include <stdint.h>
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#ifndef ABS_K
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#define ABS_K(a) ((a) > 0 ? (a) : (-(a)))
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#endif
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static FLOAT dasum_kernel(BLASLONG n, FLOAT *x1)
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{
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BLASLONG i = 0;
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FLOAT sumf = 0.0;
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if (n >= 256) {
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BLASLONG align_512 = ((64 - ((uintptr_t)x1 & (uintptr_t)0x3f)) >> 3) & 0x7;
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for (i = 0; i < align_512; i++) {
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sumf += ABS_K(x1[i]);
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}
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n -= align_512;
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x1 += align_512;
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}
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BLASLONG tail_index_SSE = n&(~7);
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BLASLONG tail_index_AVX512 = n&(~255);
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//
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if ( n >= 256 ) {
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__m512d accum_0, accum_1, accum_2, accum_3;
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accum_0 = _mm512_setzero_pd();
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accum_1 = _mm512_setzero_pd();
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accum_2 = _mm512_setzero_pd();
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accum_3 = _mm512_setzero_pd();
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for (i = 0; i < tail_index_AVX512; i += 32) {
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accum_0 += _mm512_abs_pd(_mm512_load_pd(&x1[i + 0]));
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accum_1 += _mm512_abs_pd(_mm512_load_pd(&x1[i + 8]));
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accum_2 += _mm512_abs_pd(_mm512_load_pd(&x1[i +16]));
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accum_3 += _mm512_abs_pd(_mm512_load_pd(&x1[i +24]));
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}
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accum_0 = accum_0 + accum_1 + accum_2 + accum_3;
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sumf += _mm512_reduce_add_pd(accum_0);
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}
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if (n >= 8) {
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__m128d accum_20, accum_21, accum_22, accum_23;
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accum_20 = _mm_setzero_pd();
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accum_21 = _mm_setzero_pd();
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accum_22 = _mm_setzero_pd();
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accum_23 = _mm_setzero_pd();
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__m128i abs_mask2 = _mm_set1_epi64x(0x7fffffffffffffff);
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for (i = tail_index_AVX512; i < tail_index_SSE; i += 8) {
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accum_20 += (__m128d)_mm_and_si128(_mm_loadu_si128((__m128i*)&x1[i + 0]), abs_mask2);
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accum_21 += (__m128d)_mm_and_si128(_mm_loadu_si128((__m128i*)&x1[i + 2]), abs_mask2);
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accum_22 += (__m128d)_mm_and_si128(_mm_loadu_si128((__m128i*)&x1[i + 4]), abs_mask2);
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accum_23 += (__m128d)_mm_and_si128(_mm_loadu_si128((__m128i*)&x1[i + 6]), abs_mask2);
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}
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accum_20 = accum_20 + accum_21 + accum_22 + accum_23;
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__m128d half_accum20;
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half_accum20 = _mm_hadd_pd(accum_20, accum_20);
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sumf += half_accum20[0];
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}
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for (i = tail_index_SSE; i < n; ++i) {
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sumf += ABS_K(x1[i]);
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}
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return sumf;
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}
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#endif
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