OpenBLAS/kernel/zarch/dasum.c

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

#if defined(DOUBLE) 
#define ABS fabs 
#else 
#define ABS fabsf 
#endif


 

static   FLOAT  dasum_kernel_32(BLASLONG n, FLOAT *x) {
    FLOAT asum    ; 
    __asm__  (
            "pfd     1, 0(%[ptr_x])   \n\t"
            "sllg    %%r0,%[n],3  \n\t"
            "agr     %%r0,%[ptr_x]    \n\t"   
            "vzero   %%v0       \n\t"
            "vzero   %%v1       \n\t"
            "vzero   %%v2       \n\t"
            "vzero   %%v3       \n\t"   
            ".align 16 \n\t"
            "1:      \n\t"
            "pfd     1, 256(%[ptr_temp] ) \n\t"
            "vlm     %%v24,%%v31, 0(%[ptr_temp] ) \n\t"  
    
            "vflpdb  %%v24, %%v24 \n\t"
            "vflpdb  %%v25, %%v25 \n\t"
            "vflpdb  %%v26, %%v26 \n\t"
            "vflpdb  %%v27, %%v27 \n\t"
            "vflpdb  %%v28, %%v28 \n\t"
            "vflpdb  %%v29, %%v29 \n\t"
            "vflpdb  %%v30, %%v30 \n\t"
            "vflpdb  %%v31, %%v31 \n\t"
    
            "vfadb   %%v0,%%v0,%%v24    \n\t"
            "vfadb   %%v1,%%v1,%%v25    \n\t"
            "vfadb   %%v2,%%v2,%%v26    \n\t"
            "vfadb   %%v3,%%v3,%%v27    \n\t" 
            "vfadb   %%v0,%%v0,%%v28    \n\t"
            "vfadb   %%v1,%%v1,%%v29    \n\t"
            "vfadb   %%v2,%%v2,%%v30    \n\t"
            "vfadb   %%v3,%%v3,%%v31    \n\t" 
    
            "vlm     %%v24,%%v31, 128(%[ptr_temp]) \n\t"  
    
            "vflpdb  %%v24, %%v24       \n\t"
            "vflpdb  %%v25, %%v25       \n\t"
            "vflpdb  %%v26, %%v26       \n\t"
            "vflpdb  %%v27, %%v27       \n\t"
            "vflpdb  %%v28, %%v28       \n\t"
            "vflpdb  %%v29, %%v29       \n\t"
            "vflpdb  %%v30, %%v30       \n\t"
            "vflpdb  %%v31, %%v31       \n\t"
            "la      %[ptr_temp],256(%[ptr_temp])  \n\t"  
            "vfadb   %%v0,%%v0,%%v24    \n\t"
            "vfadb   %%v1,%%v1,%%v25    \n\t"
            "vfadb   %%v2,%%v2,%%v26    \n\t"
            "vfadb   %%v3,%%v3,%%v27    \n\t" 
            "vfadb   %%v0,%%v0,%%v28    \n\t"
            "vfadb   %%v1,%%v1,%%v29    \n\t"
            "vfadb   %%v2,%%v2,%%v30    \n\t"
            "vfadb   %%v3,%%v3,%%v31    \n\t"  
            
            "clgrjl  %[ptr_temp],%%r0,1b           \n\t"
            "vfadb   %%v24,%%v0,%%v1    \n\t"
            "vfadb   %%v25,%%v2,%%v3    \n\t"
            "vfadb   %%v0,%%v25,%%v24   \n\t"
            "vrepg   %%v1,%%v0,1        \n\t"
            "adbr    %%f0,%%f1          \n\t"
            "ldr     %[asum],%%f0       \n\t"
            : [asum] "=f"(asum),[ptr_temp] "+&a"(x)
            : [mem] "m"( *(const double (*)[n])x ), [n] "r"(n), [ptr_x] "a"(x)
            : "cc", "r0" ,"f0","f1","v0","v1","v2","v3","v24","v25","v26","v27","v28","v29","v30","v31"
            );
      return asum;

}




FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x) {
    BLASLONG i = 0;
    BLASLONG j = 0;
    FLOAT sumf = 0.0;
    BLASLONG n1;

    if (n <= 0 || inc_x <= 0) return sumf;

    if (inc_x == 1) {

        n1 = n & -32;
               
        if (n1 > 0) {

            sumf = dasum_kernel_32(n1, x);
            i = n1;
        }

        while (i < n) {
            sumf += ABS(x[i]);
            i++;
        }

    } else {
        BLASLONG n1 = n & -4;
        register FLOAT sum1, sum2;
        sum1 = 0.0;
        sum2 = 0.0;
        while (j < n1) {

            sum1 += ABS(x[i]);
            sum2 += ABS(x[i + inc_x]);
            sum1 += ABS(x[i + 2 * inc_x]);
            sum2 += ABS(x[i + 3 * inc_x]);

            i += inc_x * 4;
            j += 4;

        }
        sumf = sum1 + sum2;
        while (j < n) {

            sumf += ABS(x[i]);
            i += inc_x;
            j++;
        }


    }
    return sumf;
}