msvcrt: Import expm1 implementation from musl.
Signed-off-by: Piotr Caban <piotr@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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@ -19618,7 +19618,6 @@ fi
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for ac_func in \
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exp2 \
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exp2f \
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expm1 \
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expm1f \
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fma \
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fmaf \
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@ -2658,7 +2658,6 @@ fi
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AC_CHECK_FUNCS(\
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exp2 \
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exp2f \
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expm1 \
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expm1f \
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fma \
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fmaf \
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@ -5758,12 +5758,100 @@ float CDECL exp2f(float x)
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/*********************************************************************
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* expm1 (MSVCR120.@)
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*
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* Copied from musl: src/math/expm1.c
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*/
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double CDECL expm1(double x)
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{
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double ret = unix_funcs->expm1( x );
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if (isfinite(x) && !isfinite(ret)) *_errno() = ERANGE;
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return ret;
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static const double o_threshold = 7.09782712893383973096e+02,
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ln2_hi = 6.93147180369123816490e-01,
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ln2_lo = 1.90821492927058770002e-10,
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invln2 = 1.44269504088896338700e+00,
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Q1 = -3.33333333333331316428e-02,
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Q2 = 1.58730158725481460165e-03,
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Q3 = -7.93650757867487942473e-05,
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Q4 = 4.00821782732936239552e-06,
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Q5 = -2.01099218183624371326e-07;
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double y, hi, lo, c, t, e, hxs, hfx, r1, twopk;
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union {double f; UINT64 i;} u = {x};
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UINT32 hx = u.i >> 32 & 0x7fffffff;
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int k, sign = u.i >> 63;
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/* filter out huge and non-finite argument */
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if (hx >= 0x4043687A) { /* if |x|>=56*ln2 */
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if (isnan(x))
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return x;
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if (isinf(x))
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return sign ? -1 : x;
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if (sign)
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return math_error(_UNDERFLOW, "exp", x, 0, -1);
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if (x > o_threshold)
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return math_error(_OVERFLOW, "exp", x, 0, x * 0x1p1023);
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}
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/* argument reduction */
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if (hx > 0x3fd62e42) { /* if |x| > 0.5 ln2 */
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if (hx < 0x3FF0A2B2) { /* and |x| < 1.5 ln2 */
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if (!sign) {
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hi = x - ln2_hi;
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lo = ln2_lo;
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k = 1;
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} else {
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hi = x + ln2_hi;
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lo = -ln2_lo;
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k = -1;
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}
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} else {
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k = invln2 * x + (sign ? -0.5 : 0.5);
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t = k;
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hi = x - t * ln2_hi; /* t*ln2_hi is exact here */
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lo = t * ln2_lo;
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}
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x = hi - lo;
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c = (hi - x) - lo;
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} else if (hx < 0x3c900000) { /* |x| < 2**-54, return x */
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fp_barrier(x + 0x1p120f);
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if (hx < 0x00100000)
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fp_barrier((float)x);
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return x;
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} else
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k = 0;
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/* x is now in primary range */
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hfx = 0.5 * x;
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hxs = x * hfx;
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r1 = 1.0 + hxs * (Q1 + hxs * (Q2 + hxs * (Q3 + hxs * (Q4 + hxs * Q5))));
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t = 3.0 - r1 * hfx;
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e = hxs * ((r1 - t) / (6.0 - x * t));
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if (k == 0) /* c is 0 */
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return x - (x * e - hxs);
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e = x * (e - c) - c;
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e -= hxs;
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/* exp(x) ~ 2^k (x_reduced - e + 1) */
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if (k == -1)
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return 0.5 * (x - e) - 0.5;
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if (k == 1) {
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if (x < -0.25)
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return -2.0 * (e - (x + 0.5));
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return 1.0 + 2.0 * (x - e);
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}
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u.i = (UINT64)(0x3ff + k) << 52; /* 2^k */
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twopk = u.f;
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if (k < 0 || k > 56) { /* suffice to return exp(x)-1 */
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y = x - e + 1.0;
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if (k == 1024)
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y = y * 2.0 * 0x1p1023;
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else
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y = y * twopk;
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return y - 1.0;
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}
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u.i = (UINT64)(0x3ff - k) << 52; /* 2^-k */
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if (k < 20)
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y = (x - e + (1 - u.f)) * twopk;
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else
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y = (x - (e + u.f) + 1) * twopk;
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return y;
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}
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/*********************************************************************
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@ -98,18 +98,6 @@ static float CDECL unix_exp2f( float x )
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#endif
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}
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/*********************************************************************
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* expm1
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*/
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static double CDECL unix_expm1(double x)
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{
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#ifdef HAVE_EXPM1
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return expm1(x);
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#else
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return exp(x) - 1;
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#endif
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}
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/*********************************************************************
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* expm1f
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*/
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@ -374,7 +362,6 @@ static const struct unix_funcs funcs =
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unix_expf,
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unix_exp2,
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unix_exp2f,
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unix_expm1,
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unix_expm1f,
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unix_fma,
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unix_fmaf,
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@ -29,7 +29,6 @@ struct unix_funcs
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float (CDECL *expf)(float x);
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double (CDECL *exp2)(double x);
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float (CDECL *exp2f)(float x);
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double (CDECL *expm1)(double x);
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float (CDECL *expm1f)(float x);
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double (CDECL *fma)(double x, double y, double z);
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float (CDECL *fmaf)(float x, float y, float z);
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@ -98,9 +98,6 @@
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/* Define to 1 if you have the `exp2f' function. */
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#undef HAVE_EXP2F
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/* Define to 1 if you have the `expm1' function. */
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#undef HAVE_EXPM1
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/* Define to 1 if you have the `expm1f' function. */
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#undef HAVE_EXPM1F
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