pow_special.c

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-----------
 
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#include <fpieee.h>
#include <excpt.h>
#include <float.h>
#include <math.h>
#include <errno.h>
 
#include "libm_new.h"
 
// these codes and the ones in the related .asm files have to match
#define POW_X_ONE_Y_SNAN            1
#define POW_X_ZERO_Z_INF            2
#define POW_X_NAN                   3
#define POW_Y_NAN                   4
#define POW_X_NAN_Y_NAN             5
#define POW_X_NEG_Y_NOTINT          6
#define POW_Z_ZERO                  7
#define POW_Z_DENORMAL              8
#define POW_Z_INF                   9
 
float _powf_special(float x, float y, float z, U32 code)
{
    switch(code)
    {
    case POW_X_ONE_Y_SNAN:
        {
            UT64 zm; zm.u64 = 0; zm.f32[0] = z;
            _handle_errorf("powf", _FpCodePow, zm.u64, 0, AMD_F_INVALID, 0, x, y, 2);
        }
        break;
 
    case POW_X_ZERO_Z_INF:
        {
            UT64 zm; zm.u64 = 0; zm.f32[0] = z;
            _handle_errorf("powf", _FpCodePow, zm.u64, _SING, AMD_F_DIVBYZERO, ERANGE, x, y, 2);
        }
        break;
 
    case POW_X_NAN:
    case POW_Y_NAN:
    case POW_X_NAN_Y_NAN:   
    case POW_X_NEG_Y_NOTINT:
        {
            UT64 zm; zm.u64 = 0; zm.f32[0] = z;
            _handle_errorf("powf", _FpCodePow, zm.u64, _DOMAIN, AMD_F_INVALID, EDOM, x, y, 2);
        }
        break;
 
    case POW_Z_ZERO:
        {
            UT64 zm; zm.u64 = 0; zm.f32[0] = z;
            _handle_errorf("powf", _FpCodePow, zm.u64, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, y, 2);
        }
        break;
 
    case POW_Z_INF:
        {
            UT64 zm; zm.u64 = 0; zm.f32[0] = z;
            _handle_errorf("powf", _FpCodePow, zm.u64, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, y, 2);
        }
        break;
    }
 
    return z;
}
 
double _pow_special(double x, double y, double z, U32 code)
{
    switch(code)
    {
    case POW_X_ZERO_Z_INF:
        {
            UT64 zm; zm.f64 = z;
            _handle_error("pow", _FpCodePow, zm.u64, _SING, AMD_F_DIVBYZERO, ERANGE, x, y, 2);
        }
        break;
 
    case POW_X_NAN:
    case POW_Y_NAN:
    case POW_X_NAN_Y_NAN:
    case POW_X_NEG_Y_NOTINT:
        {
            UT64 zm; zm.f64 = z;
            _handle_error("pow", _FpCodePow, zm.u64, _DOMAIN, AMD_F_INVALID, EDOM, x, y, 2);
        }
        break;
 
    case POW_Z_ZERO:
    case POW_Z_DENORMAL:
        {
            UT64 zm; zm.f64 = z;
            _handle_error("pow", _FpCodePow, zm.u64, _UNDERFLOW, AMD_F_INEXACT|AMD_F_UNDERFLOW, ERANGE, x, y, 2);
        }
        break;
 
    case POW_Z_INF:
        {
            UT64 zm; zm.f64 = z;
            _handle_error("pow", _FpCodePow, zm.u64, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, y, 2);
        }
        break;
    }
 
    return z;
}