OpenBLAS/kernel/generic/gemmkernel_4x2.c

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#include "common.h"
#include <stdbool.h>

int CNAME(BLASLONG bm,BLASLONG bn,BLASLONG bk,FLOAT alpha,FLOAT* ba,FLOAT* bb,FLOAT* C,BLASLONG ldc)
{

   BLASLONG i,j,k;
   FLOAT *C0,*C1,*ptrba,*ptrbb;

   FLOAT res0_0;
   FLOAT res0_1;
   FLOAT res0_2;
   FLOAT res0_3;

   FLOAT res1_0;
   FLOAT res1_1;
   FLOAT res1_2;
   FLOAT res1_3;

   FLOAT a0;
   FLOAT a1;

   FLOAT b0;
   FLOAT b1;

   for (j=0; j<(bn/2); j+=2)
   {
        C0 = C;
        C1 = C0+ldc;

        ptrba = ba;

        for (i=0; i<bm/4; i+=1)
	{
		ptrbb = bb;

		res0_0 = 0;
		res0_1 = 0;
		res0_2 = 0;
		res0_3 = 0;

		res1_0 = 0;
		res1_1 = 0;
		res1_2 = 0;
		res1_3 = 0;

		for (k=0; k<bk; k++)
                {
			b0 = ptrbb[0];
			b1 = ptrbb[1];

			a0 = ptrba[0];
			res0_0 += a0*b0;
			res1_0 += a0*b1;

			a1 = ptrba[1];
			res0_1 += a1*b0;
			res1_1 += a1*b1;

			a0 = ptrba[2];
			res0_2 += a0*b0;
			res1_2 += a0*b1;

			a1 = ptrba[3];
			res0_3 += a1*b0;
			res1_3 += a1*b1;

			ptrba = ptrba+4;
			ptrbb = ptrbb+2;
                }

		res0_0 *= alpha;
		res0_1 *= alpha;
		res0_2 *= alpha;
		res0_3 *= alpha;

		res1_0 *= alpha;
		res1_1 *= alpha;
		res1_2 *= alpha;
		res1_3 *= alpha;

		C0[0] += res0_0;
		C0[1] += res0_1;
		C0[2] += res0_2;
		C0[3] += res0_3;

		C1[0] += res1_0;
		C1[1] += res1_1;
		C1[2] += res1_2;
		C1[3] += res1_3;

		C0 = C0+4;
		C1 = C1+4;

	}

	if ( bm & 2 )
	{
		ptrbb = bb;

		res0_0 = 0;
		res0_1 = 0;

		res1_0 = 0;
		res1_1 = 0;

		for (k=0; k<bk; k++)
                {
			b0 = ptrbb[0];
			b1 = ptrbb[1];

			a0 = ptrba[0];
			res0_0 += a0*b0;
			res1_0 += a0*b1;

			a1 = ptrba[1];
			res0_1 += a1*b0;
			res1_1 += a1*b1;

			ptrba = ptrba+2;
			ptrbb = ptrbb+2;
                }

		res0_0 *= alpha;
		res0_1 *= alpha;

		res1_0 *= alpha;
		res1_1 *= alpha;

		C0[0] += res0_0;
		C0[1] += res0_1;

		C1[0] += res1_0;
		C1[1] += res1_1;

		C0 = C0+2;
		C1 = C1+2;

	}

	if ( bm & 1 )
	{
		ptrbb = bb;

		res0_0 = 0;

		res1_0 = 0;

		for (k=0; k<bk; k++)
                {
			b0 = ptrbb[0];
			b1 = ptrbb[1];

			a0 = ptrba[0];
			res0_0 += a0*b0;
			res1_0 += a0*b1;

			ptrba = ptrba+1;
			ptrbb = ptrbb+2;
                }

		res0_0 *= alpha;

		res1_0 *= alpha;

		C0[0] += res0_0;

		C1[0] += res1_0;

		C0 += C0+1;
		C1 += C1+1;

	}

        k = (bk<<1);
        bb = bb+k;
        i = (ldc<<1);
        C = C+i;
    }

   for (j=0; j<(bn&1); j+=1) // do the Mx1 loops
   {
        C0 = C;

        ptrba = ba;

        for (i=0; i<bm/4; i+=1) // do blocks of 4x1 loops
	{
		ptrbb = bb;

		res0_0 = 0;
		res0_1 = 0;
		res0_2 = 0;
		res0_3 = 0;

		for (k=0; k<bk; k++)
                {
			b0 = ptrbb[0];

			a0 = ptrba[0];
			res0_0 += a0*b0;

			a1 = ptrba[1];
			res0_1 += a1*b0;

			a0 = ptrba[2];
			res0_2 += a0*b0;

			a1 = ptrba[3];
			res0_3 += a1*b0;

			ptrba = ptrba+4;
			ptrbb = ptrbb+1;
                }

		res0_0 *= alpha;
		res0_1 *= alpha;
		res0_2 *= alpha;
		res0_3 *= alpha;

		C0[0] += res0_0;
		C0[1] += res0_1;
		C0[2] += res0_2;
		C0[3] += res0_3;

		C0 = C0+4;

	}

	if ( bm & 2 ) // do any 2x1 loop
	{
		ptrbb = bb;

		res0_0 = 0;
		res0_1 = 0;

		for (k=0; k<bk; k++)
                {
			b0 = ptrbb[0];

			a0 = ptrba[0];
			res0_0 += a0*b0;

			a1 = ptrba[1];
			res0_1 += a1*b0;

			ptrba = ptrba+2;
			ptrbb = ptrbb+1;
                }

		res0_0 *= alpha;
		res0_1 *= alpha;

		C0[0] += res0_0;
		C0[1] += res0_1;

		C0 = C0+2;

	}

	if ( bm & 1 ) // do any 1x1 loop
	{
		ptrbb = bb;

		res0_0 = 0;

		for (k=0; k<bk; k++)
                {
			b0 = ptrbb[0];

			a0 = ptrba[0];
			res0_0 += a0*b0;

			ptrba = ptrba+1;
			ptrbb = ptrbb+1;
                }

		res0_0 *= alpha;

		C0[0] = res0_0;

		C0 += C0+1;

	}
        k = (bk<<0);
        bb = bb+k;
        C = C+ldc;
   }
   return 0;
}