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optimized sgemv_n for very small size of m

This commit is contained in:
wernsaar 2014-09-07 18:23:48 +02:00
parent 274828fa50
commit 75207b1148
1 changed files with 138 additions and 10 deletions
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148
kernel/x86_64/sgemv_n_4.c
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@ -438,25 +438,153 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
}
if ( m3 == 0 ) return;
if ( m3 == 0 ) return(0);
j=0;
while ( j < m3 )
if ( m3 == 3 )
{
a_ptr = a;
x_ptr = x;
FLOAT temp0 = 0.0;
FLOAT temp1 = 0.0;
FLOAT temp2 = 0.0;
if ( lda == 3 && inc_x ==1 )
{
for( i = 0; i < ( n & -4 ); i+=4 )
{
temp0 += a_ptr[0] * x_ptr[0] + a_ptr[3] * x_ptr[1];
temp1 += a_ptr[1] * x_ptr[0] + a_ptr[4] * x_ptr[1];
temp2 += a_ptr[2] * x_ptr[0] + a_ptr[5] * x_ptr[1];
temp0 += a_ptr[6] * x_ptr[2] + a_ptr[9] * x_ptr[3];
temp1 += a_ptr[7] * x_ptr[2] + a_ptr[10] * x_ptr[3];
temp2 += a_ptr[8] * x_ptr[2] + a_ptr[11] * x_ptr[3];
a_ptr += 12;
x_ptr += 4;
}
for( ; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
temp2 += a_ptr[2] * x_ptr[0];
a_ptr += 3;
x_ptr ++;
}
}
else
{
for( i = 0; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
temp2 += a_ptr[2] * x_ptr[0];
a_ptr += lda;
x_ptr += inc_x;
}
}
y_ptr[0] += alpha * temp0;
y_ptr += inc_y;
y_ptr[0] += alpha * temp1;
y_ptr += inc_y;
y_ptr[0] += alpha * temp2;
return(0);
}
if ( m3 == 2 )
{
a_ptr = a;
x_ptr = x;
FLOAT temp0 = 0.0;
FLOAT temp1 = 0.0;
if ( lda == 2 && inc_x ==1 )
{
for( i = 0; i < (n & -4) ; i+=4 )
{
temp0 += a_ptr[0] * x_ptr[0] + a_ptr[2] * x_ptr[1];
temp1 += a_ptr[1] * x_ptr[0] + a_ptr[3] * x_ptr[1];
temp0 += a_ptr[4] * x_ptr[2] + a_ptr[6] * x_ptr[3];
temp1 += a_ptr[5] * x_ptr[2] + a_ptr[7] * x_ptr[3];
a_ptr += 8;
x_ptr += 4;
}
for( ; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
a_ptr += 2;
x_ptr ++;
}
}
else
{
for( i = 0; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
a_ptr += lda;
x_ptr += inc_x;
}
}
y_ptr[0] += alpha * temp0;
y_ptr += inc_y;
y_ptr[0] += alpha * temp1;
return(0);
}
if ( m3 == 1 )
{
a_ptr = a;
x_ptr = x;
FLOAT temp = 0.0;
for( i = 0; i < n; i++ )
if ( lda == 1 && inc_x ==1 )
{
temp += a_ptr[0] * x_ptr[0];
a_ptr += lda;
x_ptr += inc_x;
for( i = 0; i < (n & -4); i+=4 )
{
temp += a_ptr[i] * x_ptr[i] + a_ptr[i+1] * x_ptr[i+1] + a_ptr[i+2] * x_ptr[i+2] + a_ptr[i+3] * x_ptr[i+3];
}
for( ; i < n; i++ )
{
temp += a_ptr[i] * x_ptr[i];
}
}
else
{
for( i = 0; i < n; i++ )
{
temp += a_ptr[0] * x_ptr[0];
a_ptr += lda;
x_ptr += inc_x;
}
}
y_ptr[0] += alpha * temp;
y_ptr += inc_y;
a++;
j++;
return(0);
}
return(0);
}