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Faster GEMV for RVV #5826

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Faster GEMV for RVV #5826

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5b22140
Merge branch 'develop' of https://github.com/OpenMathLib/OpenBLAS int…
ChipKerchner May 28, 2026
6a23c36
Unroll inner loop - 2 rows at a time. Up to 1.5X faster.
ChipKerchner Jun 2, 2026
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54 changes: 46 additions & 8 deletions kernel/riscv64/gemv_n_vector.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,12 +49,33 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
{
if (n < 0) return(0);

FLOAT *a_ptr, *y_ptr, temp;
FLOAT *a_ptr, *y_ptr, *a2_ptr, temp, temp2;
BLASLONG i, j, vl;
FLOAT_V_T va, vy;
FLOAT_V_T va, vy, va2;

if (inc_y == 1) {
for (j = 0; j < n; j++) {
for (j = 0; j < (n >> 1); j++) {
temp = alpha * x[0];
temp2 = alpha * x[inc_x];
y_ptr = y;
a_ptr = a;
a2_ptr = a + lda;
for (i = m; i > 0; i -= vl) {
vl = VSETVL(i);
vy = VLEV_FLOAT(y_ptr, vl);
va = VLEV_FLOAT(a_ptr, vl);
va2 = VLEV_FLOAT(a2_ptr, vl);
vy = VFMACCVF_FLOAT(vy, temp, va, vl);
vy = VFMACCVF_FLOAT(vy, temp2, va2, vl);
VSEV_FLOAT(y_ptr, vy, vl);
y_ptr += vl;
a_ptr += vl;
a2_ptr += vl;
}
x += inc_x * 2;
a += lda * 2;
}
if (n & 1) {
temp = alpha * x[0];
y_ptr = y;
a_ptr = a;
Expand All @@ -67,12 +88,31 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
y_ptr += vl;
a_ptr += vl;
}
x += inc_x;
a += lda;
}
} else {
BLASLONG stride_y = inc_y * sizeof(FLOAT);
for (j = 0; j < n; j++) {
for (j = 0; j < (n >> 1); j++) {
temp = alpha * x[0];
temp2 = alpha * x[inc_x];
y_ptr = y;
a_ptr = a;
a2_ptr = a + lda;
for (i = m; i > 0; i -= vl) {
vl = VSETVL(i);
vy = VLSEV_FLOAT(y_ptr, stride_y, vl);
va = VLEV_FLOAT(a_ptr, vl);
va2 = VLEV_FLOAT(a2_ptr, vl);
vy = VFMACCVF_FLOAT(vy, temp, va, vl);
vy = VFMACCVF_FLOAT(vy, temp2, va2, vl);
VSSEV_FLOAT(y_ptr, stride_y, vy, vl);
y_ptr += vl * inc_y;
a_ptr += vl;
a2_ptr += vl;
}
x += inc_x * 2;
a += lda * 2;
}
if (n & 1) {
temp = alpha * x[0];
y_ptr = y;
a_ptr = a;
Expand All @@ -85,8 +125,6 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
y_ptr += vl * inc_y;
a_ptr += vl;
}
x += inc_x;
a += lda;
}
}
return(0);
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