OpenBLAS/kernel/x86_64/sbgemv_t.c

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#include "common.h"

#if defined (COOPERLAKE)
#include "sbgemv_t_microk_cooperlake.c"
#endif

#define ALIGN64_ALLOC(alloc_size, TYPE, ptr_align, ptr)   \
    ptr = (TYPE *) malloc(sizeof(TYPE)*alloc_size + 63); \
    ptr_align = ((int)(((uintptr_t)ptr & (uintptr_t)0x3F))!=0) ? (TYPE *)((char *)ptr + (64 - (int)((uintptr_t)ptr & (uintptr_t)0x3F))) : ptr

#define ALIGN64_FREE(ptr) \
    free(ptr)

#ifndef HAVE_SBGEMV_T_ACCL_KERNEL
static void sbgemv_kernel_t(BLASLONG m, BLASLONG n, float alpha, bfloat16 *a, BLASLONG lda, bfloat16 *x, float beta, float *y)
{
	BLASLONG offset_lda, offset_n;
    float accum = 0.0;

    bfloat16 * a_bf16 = malloc(sizeof(bfloat16)*m*n);
    float *    a_fp32 = malloc(sizeof(float)*m*n);
    float *    x_fp32 = malloc(sizeof(float)*n);

    for (BLASLONG i=0; i<m; i++)  {
        offset_lda = lda * i;
        offset_n = n * i;
        for (BLASLONG j=0; j<n; j++) {
            a_bf16[offset_n + j] = a[offset_lda + j];
        }
    }

    SBF16TOS_K(n, x, 1, x_fp32, 1);
    SBF16TOS_K(m*n, a_bf16, 1, a_fp32, 1);

	for (BLASLONG i=0; i<m; i++) {
		offset_n = n * i;
        accum = 0.0;
		for (BLASLONG j=0; j<n; j++) {
		    accum += a_fp32[offset_n + j] * x_fp32[j];
		}
        if (beta == ZERO) {
		    y[i] = alpha * accum;
        } else {
            y[i] = alpha * accum + beta * y[i];
        }
	}

    free(a_bf16);
    free(a_fp32);
    free(x_fp32);
}
#endif

static void bf16_compress_vector(BLASLONG n, bfloat16 * src, bfloat16 * target, BLASLONG inc)
{
    for(BLASLONG i=0; i<n; i++) {
        target[i] = src[i*inc];
    }
}

static void fp32_compress_vector(BLASLONG n, float * src, float * target, BLASLONG inc)
{
    for(BLASLONG i=0; i<n; i++) {
        target[i] = src[i*inc];
    }
}

static void fp32_expand_vector(BLASLONG n, float * src, float * target, BLASLONG inc)
{
    for(BLASLONG i=0; i<n; i++) {
        target[i*inc] = src[i];
    }
}

int CNAME(BLASLONG m, BLASLONG n, float alpha, bfloat16 *a, BLASLONG lda, bfloat16 *x, BLASLONG incx, float beta, float * y, BLASLONG incy)
{
    if ( m < 1 || n < 1) return(0);

    bfloat16 * xbuffer_align = x;
    float    * ybuffer_align = y;

    bfloat16 * xbuffer = NULL;
    float    * ybuffer = NULL;

    // Switch m and n
    BLASLONG t = m;
    m = n;
    n = t;

    if (incx != 1) {
        ALIGN64_ALLOC(n, bfloat16, xbuffer_align, xbuffer);
        bf16_compress_vector(n, x, xbuffer_align, incx);
    }

    if (incy != 1) {
        ALIGN64_ALLOC(m, float, ybuffer_align, ybuffer);
        if (beta != ZERO) {
            fp32_compress_vector(m, y, ybuffer_align, incy);
        }
    }

    sbgemv_kernel_t(m, n, alpha, a, lda, xbuffer_align, beta, ybuffer_align);

    if (incy != 1) {
        fp32_expand_vector(m, ybuffer_align, y, incy);
        ALIGN64_FREE(ybuffer);
    }

    if (incx != 1) {
        ALIGN64_FREE(xbuffer);
    }

	return(0);
}