exp_special.c

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#include <fpieee.h>
#include <excpt.h>
#include <float.h>
#include <math.h>
#include <errno.h>
 
#include "libm_new.h"
 
// y = expf(x)
// y = exp(x)
 
// these codes and the ones in the related .asm files have to match
#define EXP_X_NAN       1
#define EXP_Y_ZERO      2
#define EXP_Y_INF       3
 
float _expf_special(float x, float y, U32 code)
{
    switch(code)
    {
    case EXP_X_NAN:
        {
            UT64 ym; ym.u64 = 0; ym.f32[0] = y;
            _handle_errorf("expf", _FpCodeExp, ym.u64, _DOMAIN, 0, EDOM, x, 0.0, 1);
        }
        break;
 
    case EXP_Y_ZERO:
        {
            UT64 ym; ym.u64 = 0; ym.f32[0] = y;
            _handle_errorf("expf", _FpCodeExp, ym.u64, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, 0.0, 1);
        }
        break;
 
    case EXP_Y_INF:
        {
            UT64 ym; ym.u64 = 0; ym.f32[0] = y;
            _handle_errorf("expf", _FpCodeExp, ym.u64, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, 0.0, 1);
 
        }
        break;
    }
 
    return y;
}
 
double _exp_special(double x, double y, U32 code)
{
    switch(code)
    {
    case EXP_X_NAN:
        {
            UT64 ym; ym.f64 = y;
            _handle_error("exp", _FpCodeExp, ym.u64, _DOMAIN, 0, EDOM, x, 0.0, 1);
        }
        break;
 
    case EXP_Y_ZERO:
        {
            UT64 ym; ym.f64 = y;
            _handle_error("exp", _FpCodeExp, ym.u64, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, 0.0, 1);
        }
        break;
 
    case EXP_Y_INF:
        {
            UT64 ym; ym.f64 = y;
            _handle_error("exp", _FpCodeExp, ym.u64, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, 0.0, 1);
        }
        break;
    }
 
 
    return y;
}