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#include <math.h>
#include <float.h>
#include "common.h"
#ifdef FUNCTION_PROFILE
#include "functable.h"
#endif
#ifndef CBLAS
void NAME(FLOAT *DA, FLOAT *DB, FLOAT *C, FLOAT *S){
#else
void CNAME(FLOAT *DA, FLOAT *DB, FLOAT *C, FLOAT *S){
#endif
#ifdef DOUBLE
long double safmin = DBL_MIN;
#else
long double safmin = FLT_MIN;
#endif
#if defined(__i386__) || defined(__x86_64__) || defined(__ia64__) || defined(_M_X64) || defined(_M_IX86)
long double da = *DA;
long double db = *DB;
long double c;
long double s;
long double r, z;
long double sigma, dascal,dbscal;
long double ada = fabsl(da);
long double adb = fabsl(db);
long double maxab = MAX(ada,adb);
long double safmax;
long double scale;
#ifndef CBLAS
PRINT_DEBUG_NAME;
#else
PRINT_DEBUG_CNAME;
#endif
if (adb == ZERO) {
*C = ONE;
*S = ZERO;
*DB = ZERO;
} else if (ada == ZERO) {
*C = ZERO;
*S = ONE;
*DA = *DB;
*DB = ONE;
} else {
safmax = 1./safmin;
scale = MIN(MAX(safmin,maxab), safmax);
if (ada > adb)
sigma = copysign(1.,da);
else
sigma = copysign(1.,db);
dascal = da / scale;
dbscal = db / scale;
r = sigma * (scale * sqrt(dascal * dascal + dbscal * dbscal));
c = da / r;
s = db / r;
z = ONE;
if (ada > adb) z = s;
if ((ada <= adb) && (c != ZERO)) z = ONE / c;
*C = c;
*S = s;
*DA = r;
*DB = z;
}
#else
FLOAT da = *DA;
FLOAT db = *DB;
FLOAT c = *C;
FLOAT s = *S;
FLOAT sigma;
FLOAT r, z;
FLOAT ada = fabs(da);
FLOAT adb = fabs(db);
FLOAT maxab = MAX(ada,adb);
long double safmax ;
FLOAT scale ;
safmax = 1./safmin;
scale = MIN(MAX(safmin,maxab), safmax);
if (ada > adb)
sigma = copysign(1.,da);
else
sigma = copysign(1.,db);
#ifndef CBLAS
PRINT_DEBUG_NAME;
#else
PRINT_DEBUG_CNAME;
#endif
if (adb == ZERO) {
*C = ONE;
*S = ZERO;
*DB = ZERO;
} else if (ada == ZERO) {
*C = ZERO;
*S = ONE;
*DA = *DB;
*DB = ONE;
} else {
FLOAT aa = da / scale;
FLOAT bb = db / scale;
r = sigma * scale * sqrt(aa * aa + bb * bb);
c = da / r;
s = db / r;
z = ONE;
if (ada > adb) z = s;
if ((ada <= adb) && (c != ZERO)) z = ONE / c;
*C = c;
*S = s;
*DA = r;
*DB = z;
}
#endif
return;
}
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