quda/tests/misc.cpp

Go to the documentation of this file.

#include <stdio.h>
#include <stdlib.h>
#include "quda.h"
#include <string.h>
#include "invert_quda.h"
#include "misc.h"
 #include <assert.h>
#include "util_quda.h"
#include <test_util.h>


extern int verbose;

#define stSpinorSiteSize 6
template<typename Float>
void display_spinor_internal(Float* spinor)
{
    printf("(%f,%f) (%f,%f) (%f,%f) \t", 
           spinor[0], spinor[1], spinor[2], 
           spinor[3], spinor[4], spinor[5]);
    
    printf("\n");
    return;
}



void display_spinor(void* spinor, int len, int precision)
{    
    int i;
    
    if (precision == QUDA_DOUBLE_PRECISION){
        double* myspinor = (double*)spinor;
        for (i = 0;i < len; i++){
            display_spinor_internal(myspinor + stSpinorSiteSize*i);
        }
    }else if (precision == QUDA_SINGLE_PRECISION){
        float* myspinor = (float*)spinor;
        for (i=0;i < len ;i++){
            display_spinor_internal(myspinor + stSpinorSiteSize*i);
        }
    }
    return;
}



template<typename Float>
void display_link_internal(Float* link)
{
    int i, j;
    
    for (i = 0;i < 3; i++){
        for(j=0;j < 3; j++){
            printf("(%.10f,%.10f) \t", link[i*3*2 + j*2], link[i*3*2 + j*2 + 1]);
        }
        printf("\n");
    }
    printf("\n");
    return;
}



void display_link(void* link, int len, int precision)
{    
    int i;
    
    if (precision == QUDA_DOUBLE_PRECISION){
        double* mylink = (double*)link;
        for (i = 0;i < len; i++){
            display_link_internal(mylink + gaugeSiteSize*i);
        }
    }else if (precision == QUDA_SINGLE_PRECISION){
        float* mylink = (float*)link;
        for (i=0;i < len ;i++){
            display_link_internal(mylink + gaugeSiteSize*i);
        }
    }
    return;
}



template <typename Float>
void accumulateConjugateProduct(Float *a, Float *b, Float *c, int sign) {
  a[0] += sign * (b[0]*c[0] - b[1]*c[1]);
  a[1] -= sign * (b[0]*c[1] + b[1]*c[0]);
}


template<typename Float>
int link_sanity_check_internal_12(Float* link, int dir, int ga_idx, QudaGaugeParam* gaugeParam, int oddBit)
{
    //printf("link sanity check is called\n");
    
    int ret =0;
    
    Float refc_buf[6];
    Float* refc = &refc_buf[0];

    memset((void*)refc, 0, sizeof(refc_buf));

    Float* a = link;
    Float* b = link + 6;
    Float* c = link + 12;
    
    accumulateConjugateProduct(refc + 0*2, a + 1*2, b + 2*2, +1);
    accumulateConjugateProduct(refc + 0*2, a + 2*2, b + 1*2, -1);
    accumulateConjugateProduct(refc + 1*2, a + 2*2, b + 0*2, +1);
    accumulateConjugateProduct(refc + 1*2, a + 0*2, b + 2*2, -1);
    accumulateConjugateProduct(refc + 2*2, a + 0*2, b + 1*2, +1);
    accumulateConjugateProduct(refc + 2*2, a + 1*2, b + 0*2, -1);
    
    int X1h=gaugeParam->X[0]/2;
    int X1 =gaugeParam->X[0];    
    int X2 =gaugeParam->X[1];
    int X3 =gaugeParam->X[2];
    int X4 =gaugeParam->X[3];
    double t_boundary = (gaugeParam->t_boundary ==QUDA_ANTI_PERIODIC_T)? -1.0:1.0;

   double u0 = gaugeParam->tadpole_coeff;
   double coff= -u0*u0*24;
   //coff = (dir < 6) ? coff : ( (ga_idx >= (X4-3)*X1h*X2*X3 )? t_boundary : 1); 

   //float u0 = (dir < 6) ? gaugeParam->anisotropy : ( (ga_idx >= (X4-3)*X1h*X2*X3 )? t_boundary : 1); 

  
#if 1
   
   {
       int index = fullLatticeIndex(ga_idx, oddBit);
       int i4 = index /(X3*X2*X1);
       int i3 = (index - i4*(X3*X2*X1))/(X2*X1);
       int i2 = (index - i4*(X3*X2*X1) - i3*(X2*X1))/X1;
       int i1 = index - i4*(X3*X2*X1) - i3*(X2*X1) - i2*X1;
       
       if (dir == 0) {
           if (i4 % 2 == 1){
               coff *= -1;
           }
       }

       if (dir == 2){
           if ((i1+i4) % 2 == 1){
               coff *= -1;
           }
       }
       if (dir == 4){
           if ( (i4+i1+i2) % 2 == 1){
               coff *= -1;
           }
       }
       if (dir == 6){
           if (ga_idx >= (X4-3)*X1h*X2*X3 ){
               coff *= -1;
           } 
       }

       //printf("local ga_idx =%d, index=%d, i4,3,2,1 =%d %d %d %d\n", ga_idx, index, i4, i3, i2,i1);
 
   }
#endif
 

   refc[0]*=coff; refc[1]*=coff; refc[2]*=coff; refc[3]*=coff; refc[4]*=coff; refc[5]*=coff;
   
    
    double delta = 0.0001;
    int i;
    for (i =0;i < 6; i++){
        double diff =  refc[i] -  c[i];
        double absdiff = diff > 0? diff: (-diff);
        if (absdiff  > delta){
            printf("ERROR: sanity check failed for link\n");
            display_link_internal(link);
            printf("refc = (%.10f,%.10f) (%.10f,%.10f) (%.10f,%.10f)\n", 
                   refc[0], refc[1], refc[2], refc[3], refc[4], refc[5]);
            printf("dir=%d, ga_idx=%d, coff=%f, t_boundary=%f\n",dir, ga_idx,coff, t_boundary);
            printf("X=%d %d %d %d, X1h=%d\n", gaugeParam->X[0], X2, X3, X4, X1h);
            return -1;
        }
        
    }
    

    return ret;
}


template<typename Float>
int site_link_sanity_check_internal_12(Float* link, int dir, int ga_idx, QudaGaugeParam* gaugeParam, int oddBit)
{
    
    int ret =0;
    
    Float refc_buf[6];
    Float* refc = &refc_buf[0];

    memset((void*)refc, 0, sizeof(refc_buf));

    Float* a = link;
    Float* b = link + 6;
    Float* c = link + 12;
    
    accumulateConjugateProduct(refc + 0*2, a + 1*2, b + 2*2, +1);
    accumulateConjugateProduct(refc + 0*2, a + 2*2, b + 1*2, -1);
    accumulateConjugateProduct(refc + 1*2, a + 2*2, b + 0*2, +1);
    accumulateConjugateProduct(refc + 1*2, a + 0*2, b + 2*2, -1);
    accumulateConjugateProduct(refc + 2*2, a + 0*2, b + 1*2, +1);
    accumulateConjugateProduct(refc + 2*2, a + 1*2, b + 0*2, -1);


    int X1h=gaugeParam->X[0]/2;
    int X1 =gaugeParam->X[0];    
    int X2 =gaugeParam->X[1];
    int X3 =gaugeParam->X[2];
    int X4 =gaugeParam->X[3];

#if 1        
    double coeff= 1.0;
   
   {
       int index = fullLatticeIndex(ga_idx, oddBit);
       int i4 = index /(X3*X2*X1);
       int i3 = (index - i4*(X3*X2*X1))/(X2*X1);
       int i2 = (index - i4*(X3*X2*X1) - i3*(X2*X1))/X1;
       int i1 = index - i4*(X3*X2*X1) - i3*(X2*X1) - i2*X1;
       
       if (dir == XUP) {
           if (i4 % 2 == 1){
               coeff *= -1;
           }
       }

       if (dir == YUP){
           if ((i1+i4) % 2 == 1){
               coeff *= -1;
           }
       }
       if (dir == ZUP){
           if ( (i4+i1+i2) % 2 == 1){
               coeff *= -1;
           }
       }
       if (dir == TUP){
         if ((commCoords(3) == commDim(3) -1) && i4 == (X4-1) ){
           coeff *= -1;
         } 
       }       
   }
 
   
   refc[0]*=coeff; refc[1]*=coeff; refc[2]*=coeff; refc[3]*=coeff; refc[4]*=coeff; refc[5]*=coeff;
#endif
   
    
    double delta = 0.0001;
    int i;
    for (i =0;i < 6; i++){
        double diff =  refc[i] -  c[i];
        double absdiff = diff > 0? diff: (-diff);
        if (absdiff  > delta){
            printf("ERROR: sanity check failed for site link\n");
            display_link_internal(link);
            printf("refc = (%.10f,%.10f) (%.10f,%.10f) (%.10f,%.10f)\n", 
                   refc[0], refc[1], refc[2], refc[3], refc[4], refc[5]);
            printf("X=%d %d %d %d, X1h=%d\n", gaugeParam->X[0], X2, X3, X4, X1h);
            return -1;
        }
        
    }
    

    return ret;
}






// a+=b
template <typename Float>
void complexAddTo(Float *a, Float *b) {
  a[0] += b[0];
  a[1] += b[1];
}

// a = b*c
template <typename Float>
void complexProduct(Float *a, Float *b, Float *c) {
    a[0] = b[0]*c[0] - b[1]*c[1];
    a[1] = b[0]*c[1] + b[1]*c[0];
}

// a = conj(b)*conj(c)
template <typename Float>
void complexConjugateProduct(Float *a, Float *b, Float *c) {
    a[0] = b[0]*c[0] - b[1]*c[1];
    a[1] = -b[0]*c[1] - b[1]*c[0];
}

// a = conj(b)*c
template <typename Float>
void complexDotProduct(Float *a, Float *b, Float *c) {
    a[0] = b[0]*c[0] + b[1]*c[1];
    a[1] = b[0]*c[1] - b[1]*c[0];
}

// a += b*c
template <typename Float>
void accumulateComplexProduct(Float *a, Float *b, Float *c, Float sign) {
  a[0] += sign*(b[0]*c[0] - b[1]*c[1]);
  a[1] += sign*(b[0]*c[1] + b[1]*c[0]);
}

// a += conj(b)*c)
template <typename Float>
void accumulateComplexDotProduct(Float *a, Float *b, Float *c) {
    a[0] += b[0]*c[0] + b[1]*c[1];
    a[1] += b[0]*c[1] - b[1]*c[0];
}


template<typename Float>
int link_sanity_check_internal_8(Float* link, int dir, int ga_idx, QudaGaugeParam* gaugeParam, int oddBit)
{
    int ret =0;
    
    Float ref_link_buf[18];
    Float* ref = & ref_link_buf[0];    
    memset(ref, 0, sizeof(ref_link_buf));
    
    ref[0] = atan2(link[1], link[0]);
    ref[1] = atan2(link[13], link[12]);
    for (int i=2; i<7; i++) {
        ref[i] = link[i];
    }

    int X1h=gaugeParam->X[0]/2;
    int X2 =gaugeParam->X[1];
    int X3 =gaugeParam->X[2];
    int X4 =gaugeParam->X[3];
    double t_boundary = (gaugeParam->t_boundary ==QUDA_ANTI_PERIODIC_T)? -1.0:1.0;
    
    
    // First reconstruct first row
    Float row_sum = 0.0;
    row_sum += ref[2]*ref[2];
    row_sum += ref[3]*ref[3];
    row_sum += ref[4]*ref[4];
    row_sum += ref[5]*ref[5];

#define SMALL_NUM 1e-24
    row_sum = (row_sum != 0)?row_sum: SMALL_NUM;
#if 1
    Float u0= -gaugeParam->tadpole_coeff*gaugeParam->tadpole_coeff*24;
    {
        int X1h=gaugeParam->X[0]/2;
        int X1 =gaugeParam->X[0];
        int X2 =gaugeParam->X[1];
        int X3 =gaugeParam->X[2];
        int X4 =gaugeParam->X[3];
      
        int index = fullLatticeIndex(ga_idx, oddBit);
        int i4 = index /(X3*X2*X1);
        int i3 = (index - i4*(X3*X2*X1))/(X2*X1);
        int i2 = (index - i4*(X3*X2*X1) - i3*(X2*X1))/X1;
        int i1 = index - i4*(X3*X2*X1) - i3*(X2*X1) - i2*X1;
      
        if (dir == 0) {
            if (i4 % 2 == 1){
                u0 *= -1;
            }
        }
      
        if (dir == 1){
            if ((i1+i4) % 2 == 1){
                u0 *= -1;
            }
        }
        if (dir == 2){
            if ( (i4+i1+i2) % 2 == 1){
                u0 *= -1;
            }
        }
        if (dir == 3){
            if (ga_idx >= (X4-3)*X1h*X2*X3 ){
                u0 *= -1;
            }
        }
       
        //printf("local ga_idx =%d, index=%d, i4,3,2,1 =%d %d %d %d\n", ga_idx, index, i4, i3, i2,i1);
       
    }
#endif
    

    Float U00_mag = sqrt( (1.f/(u0*u0) - row_sum)>0? (1.f/(u0*u0)-row_sum):0);
  
    ref[14] = ref[0];
    ref[15] = ref[1];

    ref[0] = U00_mag * cos(ref[14]);
    ref[1] = U00_mag * sin(ref[14]);

    Float column_sum = 0.0;
    for (int i=0; i<2; i++) column_sum += ref[i]*ref[i];
    for (int i=6; i<8; i++) column_sum += ref[i]*ref[i];
    Float U20_mag = sqrt( (1.f/(u0*u0) - column_sum) > 0? (1.f/(u0*u0)-column_sum) : 0);

    ref[12] = U20_mag * cos(ref[15]);
    ref[13] = U20_mag * sin(ref[15]);

    // First column now restored

    // finally reconstruct last elements from SU(2) rotation
    Float r_inv2 = 1.0/(u0*row_sum);

    // U11
    Float A[2];
    complexDotProduct(A, ref+0, ref+6);
    complexConjugateProduct(ref+8, ref+12, ref+4);
    accumulateComplexProduct(ref+8, A, ref+2, u0);
    ref[8] *= -r_inv2;
    ref[9] *= -r_inv2;

    // U12
    complexConjugateProduct(ref+10, ref+12, ref+2);
    accumulateComplexProduct(ref+10, A, ref+4, -u0);
    ref[10] *= r_inv2;
    ref[11] *= r_inv2;

    // U21
    complexDotProduct(A, ref+0, ref+12);
    complexConjugateProduct(ref+14, ref+6, ref+4);
    accumulateComplexProduct(ref+14, A, ref+2, -u0);
    ref[14] *= r_inv2;
    ref[15] *= r_inv2;

    // U12
    complexConjugateProduct(ref+16, ref+6, ref+2);
    accumulateComplexProduct(ref+16, A, ref+4, u0);
    ref[16] *= -r_inv2;
    ref[17] *= -r_inv2;

    double delta = 0.0001;
    int i;
    for (i =0;i < 18; i++){

        double diff =  ref[i] -  link[i];
        double absdiff = diff > 0? diff: (-diff);
        if ( (ref[i] !=  ref[i]) || (absdiff  > delta)){
            printf("ERROR: sanity check failed for link\n");
            display_link_internal(link);
            printf("reconstructed link is\n");
            display_link_internal(ref);
            printf("dir=%d, ga_idx=%d, u0=%f, t_boundary=%f\n",dir, ga_idx, u0, t_boundary);
            printf("X=%d %d %d %d, X1h=%d\n", gaugeParam->X[0], X2, X3, X4, X1h);
            return -1;
        }
        
    }
    

    return ret;
}


//this len must be V
int
link_sanity_check(void* link, int len, int precision, int dir, QudaGaugeParam* gaugeParam)
{
    int i;
    int rc = 0;
    
    if (precision == QUDA_DOUBLE_PRECISION){
        double* mylink = (double*)link;
        //even
        for (i = 0;i < len/2; i++){
            rc = link_sanity_check_internal_12(mylink + gaugeSiteSize*i, dir, i, gaugeParam, 0);
            if (rc != 0){
                printf("ERROR: even link sanity check failed, i=%d\n",i);
                display_link_internal(mylink+gaugeSiteSize*i);
                exit(1);
            }
        }
        
        mylink = mylink + gaugeSiteSize*len/2;
        //odd
        for (i = 0;i < len/2; i++){
            rc = link_sanity_check_internal_12(mylink + gaugeSiteSize*i, dir, i, gaugeParam, 1);
            if (rc != 0){
                printf("ERROR: odd link sanity check failed, i=%d\n",i);
                display_link_internal(mylink+gaugeSiteSize*i);
                exit(1);
            }
        }       
        
    }else if (precision == QUDA_SINGLE_PRECISION){
        float* mylink = (float*)link;

        //even
        for (i=0;i < len/2 ;i++){
            rc = link_sanity_check_internal_12(mylink + gaugeSiteSize*i, dir, i, gaugeParam, 0);
            if (rc != 0){
                printf("ERROR: even link sanity check 12 failed, i=%d\n",i);
                exit(1);
            }
            /*
            rc = link_sanity_check_internal_8(mylink + gaugeSiteSize*i, dir, i, gaugeParam, 0);
            if (rc != 0){
                printf("ERROR: even link sanity check 8 failed, i=%d\n",i);
                exit(1);
            }
            */
            
        }
        mylink = mylink + gaugeSiteSize*len/2;
        //odd
        for (i=0;i < len/2 ;i++){
            rc = link_sanity_check_internal_12(mylink + gaugeSiteSize*i, dir, i, gaugeParam, 1);
            if (rc != 0){
                printf("ERROR: odd link sanity check 12 failed, i=%d\n", i);
                exit(1);
            }   
            /*
            rc = link_sanity_check_internal_8(mylink + gaugeSiteSize*i, dir, i, gaugeParam, 0);
            if (rc != 0){
                printf("ERROR: even link sanity check 8 failed, i=%d\n",i);
                exit(1);
            }
            */
        }       

    }
    
    return rc;
}



//this len must be V
int
site_link_sanity_check(void* link, int len, int precision, QudaGaugeParam* gaugeParam)
{
    int i;
    int rc = 0;
    int dir;
    
    if (precision == QUDA_DOUBLE_PRECISION){
        double* mylink = (double*)link;
        //even  
        for (i = 0;i < len/2; i++){
            for(dir=XUP;dir <= TUP; dir++){
                rc = site_link_sanity_check_internal_12(mylink + gaugeSiteSize*(4*i+dir), dir, i, gaugeParam, 0);
                if (rc != 0){
                    printf("ERROR: even link sanity check failed, i=%d, function %s\n",i, __FUNCTION__);
                    display_link_internal(mylink+gaugeSiteSize*i);
                    exit(1);
                }
            }
        }
        
        mylink = mylink + 4*gaugeSiteSize*len/2;
        //odd
        for (i = 0;i < len/2; i++){
            for(dir=XUP;dir <= TUP; dir++){         
                rc = site_link_sanity_check_internal_12(mylink + gaugeSiteSize*(4*i+dir), dir, i, gaugeParam, 1);
                if (rc != 0){
                    printf("ERROR: odd link sanity check failed, i=%d, function %s\n",i, __FUNCTION__);
                    display_link_internal(mylink+gaugeSiteSize*i);
                    exit(1);
                }
            }
        }       
        
    }else if (precision == QUDA_SINGLE_PRECISION){
        float* mylink = (float*)link;

        //even
        for (i=0;i < len/2 ;i++){
            for(dir=XUP;dir <= TUP; dir++){
                rc = site_link_sanity_check_internal_12(mylink + gaugeSiteSize*(4*i+dir), dir, i, gaugeParam, 0);
                if (rc != 0){
                    printf("ERROR: even link sanity check 12 failed, i=%d, function %s\n",i, __FUNCTION__);
                    exit(1);
                }
            }
        }
        mylink = mylink + 4*gaugeSiteSize*len/2;
        //odd
        for (i=0;i < len/2 ;i++){
            for(dir=XUP;dir <= TUP; dir++){
                rc = site_link_sanity_check_internal_12(mylink + gaugeSiteSize*(4*i+dir), dir, i, gaugeParam, 1);
                if (rc != 0){
                    printf("ERROR: odd link sanity check 12 failed, i=%d, function %s\n", i, __FUNCTION__);
                    exit(1);
                }       
            }
        }       

    }
    
    return rc;
}


QudaReconstructType
get_recon(char* s)
{
    QudaReconstructType  ret;
    
    if (strcmp(s, "8") == 0){
        ret =  QUDA_RECONSTRUCT_8;
    }else if (strcmp(s, "12") == 0){
        ret =  QUDA_RECONSTRUCT_12;
    }else if (strcmp(s, "18") == 0){
        ret =  QUDA_RECONSTRUCT_NO;
    }else{
        fprintf(stderr, "Error: invalid reconstruct type\n");
        exit(1);
    }
    
    return ret;
    
    
}

QudaPrecision
get_prec(char* s)
{
    QudaPrecision ret = QUDA_DOUBLE_PRECISION;
    
    if (strcmp(s, "double") == 0){
        ret = QUDA_DOUBLE_PRECISION;
    }else if (strcmp(s, "single") == 0){
        ret = QUDA_SINGLE_PRECISION;
    }else if (strcmp(s, "half") == 0){
        ret = QUDA_HALF_PRECISION;
    }else{
        fprintf(stderr, "Error: invalid precision type\n");     
        exit(1);
    }
    
    return ret;
}

const char* 
get_prec_str(QudaPrecision prec)
{
    const char* ret;
    
    switch( prec){
        
    case QUDA_DOUBLE_PRECISION:
        ret=  "double";
        break;
    case QUDA_SINGLE_PRECISION:
        ret= "single";
        break;
    case QUDA_HALF_PRECISION:
        ret= "half";
        break;
    default:
        ret = "unknown";        
        break;
    }
    
    
    return ret;
}


const char* 
get_unitarization_str(bool svd_only)
{
  const char* ret;
 
  if(svd_only){
    ret = "SVD";
  }else{
    ret = "Cayley-Hamilton/SVD";
  }
  return ret;
}

const char* 
get_gauge_order_str(QudaGaugeFieldOrder order)
{
  const char* ret;

  switch(order){
    case QUDA_QDP_GAUGE_ORDER:
        ret = "qdp";
        break;

    case QUDA_MILC_GAUGE_ORDER:
        ret = "milc";
        break;

    case QUDA_CPS_WILSON_GAUGE_ORDER:
        ret = "cps_wilson";
        break;

    default:
        ret = "unknown";
        break;
  }     

  return ret;
}


const char* 
get_recon_str(QudaReconstructType recon)
{
    const char* ret;
    switch(recon){
    case QUDA_RECONSTRUCT_12:
        ret= "12";
        break;
    case QUDA_RECONSTRUCT_8:
        ret = "8";
        break;
    case QUDA_RECONSTRUCT_NO:
        ret = "18";
        break;
    default:
        ret="unknown";
        break;
    }
    
    return ret;
}

const char*
get_test_type(int t)
{
    const char* ret;
    switch(t){
    case 0:
        ret = "even";
        break;
    case 1:
        ret = "odd";
        break;
    case 2:
        ret = "full";
        break;
    case 3:
        ret = "mcg_even";
        break;  
    case 4:
        ret = "mcg_odd";
        break;  
    case 5:
        ret = "mcg_full";
        break;  
    default:
        ret = "unknown";
        break;
    }
    
    return ret;
}

QudaDslashType
get_dslash_type(char* s)
{
  QudaDslashType ret =  QUDA_INVALID_DSLASH;
  
  if (strcmp(s, "wilson") == 0){
    ret = QUDA_WILSON_DSLASH;
  }else if (strcmp(s, "clover") == 0){
    ret = QUDA_CLOVER_WILSON_DSLASH;
  }else if (strcmp(s, "twisted_mass") == 0){
    ret = QUDA_TWISTED_MASS_DSLASH;
  }else if (strcmp(s, "asqtad") == 0){
    ret =  QUDA_ASQTAD_DSLASH;
  }else if (strcmp(s, "domain_wall") == 0){
    ret =  QUDA_DOMAIN_WALL_DSLASH;
  }else{
    fprintf(stderr, "Error: invalid dslash type\n");    
    exit(1);
  }
  
  return ret;
}

const char* 
get_dslash_type_str(QudaDslashType type)
{
  const char* ret;
  
  switch( type){        
  case QUDA_WILSON_DSLASH:
    ret=  "wilson";
    break;
  case QUDA_CLOVER_WILSON_DSLASH:
    ret= "clover";
    break;
  case QUDA_TWISTED_MASS_DSLASH:
    ret= "twisted_mass";
    break;
  case QUDA_ASQTAD_DSLASH:
    ret = "asqtad";
    break;
  case QUDA_DOMAIN_WALL_DSLASH:
    ret = "domain_wall";
      break;
  default:
    ret = "unknown";    
    break;
  }
  
  
  return ret;
    
}

const char* 
get_quda_ver_str()
{
  static char vstr[32];
  int major_num = QUDA_VERSION_MAJOR;
  int minor_num = QUDA_VERSION_MINOR;
  int ext_num = QUDA_VERSION_SUBMINOR;
  sprintf(vstr, "%1d.%1d.%1d", 
          major_num,
          minor_num,
          ext_num);
  return vstr;
}