reactos/sdk/lib/crt/math/libm_sse2/log_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"

// y = log10f(x)
// y = log10(x)
// y = logf(x)
// y = log(x)

// these codes and the ones in the related .asm files have to match
#define LOG_X_ZERO      1
#define LOG_X_NEG       2
#define LOG_X_NAN       3

static float _logf_special_common(float x, float y, U32 code, unsigned int op, char *name)
{
    switch(code)
    {
    case LOG_X_ZERO:
        {
            UT64 ym; ym.u64 = 0; ym.f32[0] = y;
            _handle_errorf(name, op, ym.u64, _SING, AMD_F_DIVBYZERO, ERANGE, x, 0.0, 1);
        }
        break;

    case LOG_X_NEG:
        {
            UT64 ym; ym.u64 = 0; ym.f32[0] = y;
            _handle_errorf(name, op, ym.u64, _DOMAIN, AMD_F_INVALID, EDOM, x, 0.0, 1);
        }
        break;

    case LOG_X_NAN:
        {
            unsigned int is_snan;
            UT32 xm; UT64 ym;
            xm.f32 = x;
            is_snan = (((xm.u32 & QNAN_MASK_32) == QNAN_SET_32) ? 0 : 1);
            ym.u64 = 0; ym.f32[0] = y;

            if(is_snan)
            {
                _handle_errorf(name, op, ym.u64, _DOMAIN, AMD_F_INVALID, EDOM, x, 0.0, 1);
            }
            else
            {
                _handle_errorf(name, op, ym.u64, _DOMAIN, 0, EDOM, x, 0.0, 1);
            }
        }
        break;
    }

    return y;
}

float _logf_special(float x, float y, U32 code)
{
    return _logf_special_common(x, y, code, _FpCodeLog, "logf");
}

float _log10f_special(float x, float y, U32 code)
{
    return _logf_special_common(x, y, code, _FpCodeLog10, "log10f");
}

static double _log_special_common(double x, double y, U32 code, unsigned int op, char *name)
{
    switch(code)
    {
    case LOG_X_ZERO:
        {
            UT64 ym; ym.f64 = y;
            _handle_error(name, op, ym.u64, _SING, AMD_F_DIVBYZERO, ERANGE, x, 0.0, 1);
        }
        break;

    case LOG_X_NEG:
        {
            UT64 ym; ym.f64 = y;
            _handle_error(name, op, ym.u64, _DOMAIN, AMD_F_INVALID, EDOM, x, 0.0, 1);
        }
        break;

    case LOG_X_NAN:
        {
            UT64 ym; ym.f64 = y;
            _handle_error(name, op, ym.u64, _DOMAIN, 0, EDOM, x, 0.0, 1);
        }
        break;
    }

    return y;
}

double _log_special(double x, double y, U32 code)
{
    return _log_special_common(x, y, code, _FpCodeLog, "log");
}

double _log10_special(double x, double y, U32 code)
{
    return _log_special_common(x, y, code, _FpCodeLog10, "log10");
}