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various code cleanups and comments

pull/1712/head
Arjan van de Ven 7 years ago
parent
f2810beafb
commit
9c29524f50
2 changed files with 71 additions and 60 deletions
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  1. +13
    -24
      kernel/x86_64/dgemv_n_microk_haswell-4.c
  2. +58
    -36
      kernel/x86_64/dsymv_L_microk_haswell-2.c

+ 13
- 24
kernel/x86_64/dgemv_n_microk_haswell-4.c View File

@@ -25,7 +25,7 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

/* Ensure that the compiler knows how to generate AVX2 instructions if it doesn't already*/
/* Ensure that the compiler knows how to generate AVX2 instructions if it doesn't already */
#ifndef __AVX512CD_
#pragma GCC target("avx2,fma")
#endif
@@ -68,17 +68,13 @@ static void dgemv_kernel_4x4( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT
__m512d tempY;
__m512d sum;

sum = _mm512_add_pd(
_mm512_add_pd(
_mm512_mul_pd(_mm512_loadu_pd(&ap[0][i]), x05),
_mm512_mul_pd(_mm512_loadu_pd(&ap[1][i]), x15)),
_mm512_add_pd(
_mm512_mul_pd(_mm512_loadu_pd(&ap[2][i]), x25),
_mm512_mul_pd(_mm512_loadu_pd(&ap[3][i]), x35))
);
sum = _mm512_loadu_pd(&ap[0][i]) * x05 +
_mm512_loadu_pd(&ap[1][i]) * x15 +
_mm512_loadu_pd(&ap[2][i]) * x25 +
_mm512_loadu_pd(&ap[3][i]) * x35;

tempY = _mm512_loadu_pd(&y[i]);
tempY = _mm512_add_pd(tempY, _mm512_mul_pd(sum, __alpha5));
tempY += sum * __alpha5;
_mm512_storeu_pd(&y[i], tempY);
}
#endif
@@ -87,17 +83,13 @@ static void dgemv_kernel_4x4( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT
__m256d tempY;
__m256d sum;

sum = _mm256_add_pd(
_mm256_add_pd(
_mm256_mul_pd(_mm256_loadu_pd(&ap[0][i]), x0),
_mm256_mul_pd(_mm256_loadu_pd(&ap[1][i]), x1)),
_mm256_add_pd(
_mm256_mul_pd(_mm256_loadu_pd(&ap[2][i]), x2),
_mm256_mul_pd(_mm256_loadu_pd(&ap[3][i]), x3))
);
sum = _mm256_loadu_pd(&ap[0][i]) * x0 +
_mm256_loadu_pd(&ap[1][i]) * x1 +
_mm256_loadu_pd(&ap[2][i]) * x2 +
_mm256_loadu_pd(&ap[3][i]) * x3;

tempY = _mm256_loadu_pd(&y[i]);
tempY = _mm256_add_pd(tempY, _mm256_mul_pd(sum, __alpha));
tempY += sum * __alpha;
_mm256_storeu_pd(&y[i], tempY);
}

@@ -124,13 +116,10 @@ static void dgemv_kernel_4x2( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT
__m256d tempY;
__m256d sum;

sum = _mm256_add_pd(
_mm256_mul_pd(_mm256_loadu_pd(&ap[0][i]), x0),
_mm256_mul_pd(_mm256_loadu_pd(&ap[1][i]), x1)
);
sum = _mm256_loadu_pd(&ap[0][i]) * x0 + _mm256_loadu_pd(&ap[1][i]) * x1;

tempY = _mm256_loadu_pd(&y[i]);
tempY = _mm256_add_pd(tempY, _mm256_mul_pd(sum, __alpha));
tempY += sum * __alpha;
_mm256_storeu_pd(&y[i], tempY);
}



+ 58
- 36
kernel/x86_64/dsymv_L_microk_haswell-2.c View File

@@ -25,6 +25,14 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/


/* Ensure that the compiler knows how to generate AVX2 instructions if it doesn't already */
#ifndef __AVX512CD_
#pragma GCC target("avx2,fma")
#endif

#ifdef __AVX2__

#include <immintrin.h>

#define HAVE_KERNEL_4x4 1
@@ -33,13 +41,14 @@ static void dsymv_kernel_4x4(BLASLONG from, BLASLONG to, FLOAT **a, FLOAT *x, FL
{


__m256d temp2_0, temp2_1, temp2_2, temp2_3; // temp2_0 temp2_1 temp2_2 temp2_3
__m256d accum_0, accum_1, accum_2, accum_3;
__m256d temp1_0, temp1_1, temp1_2, temp1_3;

temp2_0 = _mm256_setzero_pd();
temp2_1 = _mm256_setzero_pd();
temp2_2 = _mm256_setzero_pd();
temp2_3 = _mm256_setzero_pd();
/* the 256 bit wide acculmulator vectors start out as zero */
accum_0 = _mm256_setzero_pd();
accum_1 = _mm256_setzero_pd();
accum_2 = _mm256_setzero_pd();
accum_3 = _mm256_setzero_pd();

temp1_0 = _mm256_broadcastsd_pd(_mm_load_sd(&temp1[0]));
temp1_1 = _mm256_broadcastsd_pd(_mm_load_sd(&temp1[1]));
@@ -47,15 +56,16 @@ static void dsymv_kernel_4x4(BLASLONG from, BLASLONG to, FLOAT **a, FLOAT *x, FL
temp1_3 = _mm256_broadcastsd_pd(_mm_load_sd(&temp1[3]));

#ifdef __AVX512CD__
__m512d temp2_05, temp2_15, temp2_25, temp2_35; // temp2_0 temp2_1 temp2_2 temp2_3
__m512d accum_05, accum_15, accum_25, accum_35;
__m512d temp1_05, temp1_15, temp1_25, temp1_35;
BLASLONG to2;
int delta;

temp2_05 = _mm512_setzero_pd();
temp2_15 = _mm512_setzero_pd();
temp2_25 = _mm512_setzero_pd();
temp2_35 = _mm512_setzero_pd();
/* the 512 bit wide accumulator vectors start out as zero */
accum_05 = _mm512_setzero_pd();
accum_15 = _mm512_setzero_pd();
accum_25 = _mm512_setzero_pd();
accum_35 = _mm512_setzero_pd();

temp1_05 = _mm512_broadcastsd_pd(_mm_load_sd(&temp1[0]));
temp1_15 = _mm512_broadcastsd_pd(_mm_load_sd(&temp1[1]));
@@ -80,19 +90,23 @@ static void dsymv_kernel_4x4(BLASLONG from, BLASLONG to, FLOAT **a, FLOAT *x, FL

_y += temp1_05 * a0 + temp1_15 * a1 + temp1_25 * a2 + temp1_35 * a3;

temp2_05 += _x * a0;
temp2_15 += _x * a1;
temp2_25 += _x * a2;
temp2_35 += _x * a3;
accum_05 += _x * a0;
accum_15 += _x * a1;
accum_25 += _x * a2;
accum_35 += _x * a3;

_mm512_storeu_pd(&y[from], _y);

};

temp2_0 = _mm256_add_pd(_mm512_extractf64x4_pd(temp2_05, 0), _mm512_extractf64x4_pd(temp2_05, 1));
temp2_1 = _mm256_add_pd(_mm512_extractf64x4_pd(temp2_15, 0), _mm512_extractf64x4_pd(temp2_15, 1));
temp2_2 = _mm256_add_pd(_mm512_extractf64x4_pd(temp2_25, 0), _mm512_extractf64x4_pd(temp2_25, 1));
temp2_3 = _mm256_add_pd(_mm512_extractf64x4_pd(temp2_35, 0), _mm512_extractf64x4_pd(temp2_35, 1));
/*
* we need to fold our 512 bit wide accumulator vectors into 256 bit wide vectors so that the AVX2 code
* below can continue using the intermediate results in its loop
*/
accum_0 = _mm256_add_pd(_mm512_extractf64x4_pd(accum_05, 0), _mm512_extractf64x4_pd(accum_05, 1));
accum_1 = _mm256_add_pd(_mm512_extractf64x4_pd(accum_15, 0), _mm512_extractf64x4_pd(accum_15, 1));
accum_2 = _mm256_add_pd(_mm512_extractf64x4_pd(accum_25, 0), _mm512_extractf64x4_pd(accum_25, 1));
accum_3 = _mm256_add_pd(_mm512_extractf64x4_pd(accum_35, 0), _mm512_extractf64x4_pd(accum_35, 1));

#endif

@@ -103,6 +117,7 @@ static void dsymv_kernel_4x4(BLASLONG from, BLASLONG to, FLOAT **a, FLOAT *x, FL
_y = _mm256_loadu_pd(&y[from]);
_x = _mm256_loadu_pd(&x[from]);

/* load 4 rows of matrix data */
a0 = _mm256_loadu_pd(&a[0][from]);
a1 = _mm256_loadu_pd(&a[1][from]);
a2 = _mm256_loadu_pd(&a[2][from]);
@@ -110,33 +125,40 @@ static void dsymv_kernel_4x4(BLASLONG from, BLASLONG to, FLOAT **a, FLOAT *x, FL

_y += temp1_0 * a0 + temp1_1 * a1 + temp1_2 * a2 + temp1_3 * a3;

temp2_0 += _x * a0;
temp2_1 += _x * a1;
temp2_2 += _x * a2;
temp2_3 += _x * a3;
accum_0 += _x * a0;
accum_1 += _x * a1;
accum_2 += _x * a2;
accum_3 += _x * a3;

_mm256_storeu_pd(&y[from], _y);

};

__m128d xmm0, xmm1, xmm2, xmm3;
/*
* we now have 4 accumulator vectors. Each vector needs to be summed up element wise and stored in the temp2
* output array. There is no direct instruction for this in 256 bit space, only in 128 space.
*/

__m128d half_accum0, half_accum1, half_accum2, half_accum3;

xmm0 = _mm_add_pd(_mm256_extractf128_pd(temp2_0, 0), _mm256_extractf128_pd(temp2_0, 1));
xmm1 = _mm_add_pd(_mm256_extractf128_pd(temp2_1, 0), _mm256_extractf128_pd(temp2_1, 1));
xmm2 = _mm_add_pd(_mm256_extractf128_pd(temp2_2, 0), _mm256_extractf128_pd(temp2_2, 1));
xmm3 = _mm_add_pd(_mm256_extractf128_pd(temp2_3, 0), _mm256_extractf128_pd(temp2_3, 1));

xmm0 = _mm_hadd_pd(xmm0, xmm0);
xmm1 = _mm_hadd_pd(xmm1, xmm1);
xmm2 = _mm_hadd_pd(xmm2, xmm2);
xmm3 = _mm_hadd_pd(xmm3, xmm3);
/* Add upper half to lower half of each of the four 256 bit vectors to get to four 128 bit vectors */
half_accum0 = _mm_add_pd(_mm256_extractf128_pd(accum_0, 0), _mm256_extractf128_pd(accum_0, 1));
half_accum1 = _mm_add_pd(_mm256_extractf128_pd(accum_1, 0), _mm256_extractf128_pd(accum_1, 1));
half_accum2 = _mm_add_pd(_mm256_extractf128_pd(accum_2, 0), _mm256_extractf128_pd(accum_2, 1));
half_accum3 = _mm_add_pd(_mm256_extractf128_pd(accum_3, 0), _mm256_extractf128_pd(accum_3, 1));

/* in 128 bit land there is a hadd operation to do the rest of the element-wise sum in one go */
half_accum0 = _mm_hadd_pd(half_accum0, half_accum0);
half_accum1 = _mm_hadd_pd(half_accum1, half_accum1);
half_accum2 = _mm_hadd_pd(half_accum2, half_accum2);
half_accum3 = _mm_hadd_pd(half_accum3, half_accum3);

temp2[0] += xmm0[0];
temp2[1] += xmm1[0];
temp2[2] += xmm2[0];
temp2[3] += xmm3[0];
/* and store the lowest double value from each of these vectors in the temp2 output */
temp2[0] += half_accum0[0];
temp2[1] += half_accum1[0];
temp2[2] += half_accum2[0];
temp2[3] += half_accum3[0];
}

#endif

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