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Fix SGEMV on POWER8 by reverting to the non-vectorized earlier code #5125

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Merged
merged 2 commits into from
Feb 12, 2025
Merged

Fix SGEMV on POWER8 by reverting to the non-vectorized earlier code #5125

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98b5ef9
Restore the non-vectorized code from before PR4880 for POWER8
martin-frbg Feb 12, 2025
81eed86
Restore the non-vectorized code from before PR4880 for POWER8
martin-frbg Feb 12, 2025
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23 changes: 19 additions & 4 deletions kernel/power/sgemv_t.c
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,17 @@ static void sgemv_kernel_4x8(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA
temp7 += v_x[i] * va7[i];
}


#if defined(POWER8)
y[0] += alpha * (temp0[0] + temp0[1]+temp0[2] + temp0[3]);
y[1] += alpha * (temp1[0] + temp1[1]+temp1[2] + temp1[3]);
y[2] += alpha * (temp2[0] + temp2[1]+temp2[2] + temp2[3]);
y[3] += alpha * (temp3[0] + temp3[1]+temp3[2] + temp3[3]);

y[4] += alpha * (temp4[0] + temp4[1]+temp4[2] + temp4[3]);
y[5] += alpha * (temp5[0] + temp5[1]+temp5[2] + temp5[3]);
y[6] += alpha * (temp6[0] + temp6[1]+temp6[2] + temp6[3]);
y[7] += alpha * (temp7[0] + temp7[1]+temp7[2] + temp7[3]);
#else
register __vector float t0, t1, t2, t3;
register __vector float a = { alpha, alpha, alpha, alpha };
__vector float *v_y = (__vector float*) y;
Expand All @@ -105,7 +115,7 @@ static void sgemv_kernel_4x8(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA

v_y[0] += a * temp0;
v_y[1] += a * temp4;

#endif
}


Expand All @@ -132,7 +142,12 @@ static void sgemv_kernel_4x4(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA
temp2 += v_x[i] * va2[i];
temp3 += v_x[i] * va3[i];
}

#if defined(POWER8)
y[0] += alpha * (temp0[0] + temp0[1]+temp0[2] + temp0[3]);
y[1] += alpha * (temp1[0] + temp1[1]+temp1[2] + temp1[3]);
y[2] += alpha * (temp2[0] + temp2[1]+temp2[2] + temp2[3]);
y[3] += alpha * (temp3[0] + temp3[1]+temp3[2] + temp3[3]);
#else
register __vector float t0, t1, t2, t3;
register __vector float a = { alpha, alpha, alpha, alpha };
__vector float *v_y = (__vector float*) y;
Expand All @@ -148,7 +163,7 @@ static void sgemv_kernel_4x4(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA
temp0 += temp1 + temp2 + temp3;

v_y[0] += a * temp0;

#endif
}


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24 changes: 20 additions & 4 deletions kernel/power/sgemv_t_8.c
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Original file line number Diff line number Diff line change
Expand Up @@ -99,7 +99,17 @@ static void sgemv_kernel_8x8(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA
temp7 += vx1* va7_1 + vx2 * va7_2;
}


#if defined(POWER8)
y[0] += alpha * (temp0[0] + temp0[1]+temp0[2] + temp0[3]);
y[1] += alpha * (temp1[0] + temp1[1]+temp1[2] + temp1[3]);
y[2] += alpha * (temp2[0] + temp2[1]+temp2[2] + temp2[3]);
y[3] += alpha * (temp3[0] + temp3[1]+temp3[2] + temp3[3]);

y[4] += alpha * (temp4[0] + temp4[1]+temp4[2] + temp4[3]);
y[5] += alpha * (temp5[0] + temp5[1]+temp5[2] + temp5[3]);
y[6] += alpha * (temp6[0] + temp6[1]+temp6[2] + temp6[3]);
y[7] += alpha * (temp7[0] + temp7[1]+temp7[2] + temp7[3]);
#else
register __vector float t0, t1, t2, t3;
register __vector float a = { alpha, alpha, alpha, alpha };
__vector float *v_y = (__vector float*) y;
Expand All @@ -126,7 +136,7 @@ static void sgemv_kernel_8x8(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA

v_y[0] += a * temp0;
v_y[1] += a * temp4;

#endif
}


Expand All @@ -153,7 +163,13 @@ static void sgemv_kernel_8x4(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA
temp2 += v_x[i] * va2[i] + v_x[i+1] * va2[i+1];
temp3 += v_x[i] * va3[i] + v_x[i+1] * va3[i+1];
}


#if defined(POWER8)
y[0] += alpha * (temp0[0] + temp0[1]+temp0[2] + temp0[3]);
y[1] += alpha * (temp1[0] + temp1[1]+temp1[2] + temp1[3]);
y[2] += alpha * (temp2[0] + temp2[1]+temp2[2] + temp2[3]);
y[3] += alpha * (temp3[0] + temp3[1]+temp3[2] + temp3[3]);
#else
register __vector float t0, t1, t2, t3;
register __vector float a = { alpha, alpha, alpha, alpha };
__vector float *v_y = (__vector float*) y;
Expand All @@ -169,7 +185,7 @@ static void sgemv_kernel_8x4(BLASLONG n, BLASLONG lda, FLOAT *ap, FLOAT *x, FLOA
temp0 += temp1 + temp2 + temp3;

v_y[0] += a * temp0;

#endif
}


Expand Down
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