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msvcrt: Use the atan() implementation from the bundled musl library.
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@ -78,11 +78,13 @@ void msvcrt_init_math( void *module )
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}
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/* Copied from musl: src/internal/libm.h */
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#if !defined(__i386__) || _MSVCR_VER>=120
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static inline float fp_barrierf(float x)
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{
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volatile float y = x;
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return y;
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}
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#endif
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static inline double fp_barrier(double x)
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{
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@ -489,93 +491,14 @@ double CDECL MSVCRT_asin( double x )
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/*********************************************************************
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* atan (MSVCRT.@)
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*
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* Copied from musl: src/math/atan.c
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*/
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double CDECL atan( double x )
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#if _MSVCR_VER == 0 /* other versions call atan() directly */
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double CDECL MSVCRT_atan( double x )
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{
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static const double atanhi[] = {
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4.63647609000806093515e-01,
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7.85398163397448278999e-01,
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9.82793723247329054082e-01,
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1.57079632679489655800e+00,
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};
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static const double atanlo[] = {
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2.26987774529616870924e-17,
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3.06161699786838301793e-17,
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1.39033110312309984516e-17,
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6.12323399573676603587e-17,
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};
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static const double aT[] = {
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3.33333333333329318027e-01,
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-1.99999999998764832476e-01,
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1.42857142725034663711e-01,
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-1.11111104054623557880e-01,
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9.09088713343650656196e-02,
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-7.69187620504482999495e-02,
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6.66107313738753120669e-02,
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-5.83357013379057348645e-02,
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4.97687799461593236017e-02,
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-3.65315727442169155270e-02,
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1.62858201153657823623e-02,
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};
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double w, s1, s2, z;
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unsigned int ix, sign;
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int id;
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#if _MSVCR_VER == 0
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if (isnan(x)) return math_error(_DOMAIN, "atan", x, 0, x);
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#endif
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ix = *(ULONGLONG*)&x >> 32;
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sign = ix >> 31;
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ix &= 0x7fffffff;
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if (ix >= 0x44100000) { /* if |x| >= 2^66 */
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if (isnan(x))
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return x;
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z = atanhi[3] + 7.5231638452626401e-37;
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return sign ? -z : z;
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}
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if (ix < 0x3fdc0000) { /* |x| < 0.4375 */
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if (ix < 0x3e400000) { /* |x| < 2^-27 */
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if (ix < 0x00100000)
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/* raise underflow for subnormal x */
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fp_barrierf((float)x);
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return x;
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}
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id = -1;
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} else {
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x = fabs(x);
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if (ix < 0x3ff30000) { /* |x| < 1.1875 */
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if (ix < 0x3fe60000) { /* 7/16 <= |x| < 11/16 */
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id = 0;
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x = (2.0 * x - 1.0) / (2.0 + x);
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} else { /* 11/16 <= |x| < 19/16 */
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id = 1;
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x = (x - 1.0) / (x + 1.0);
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}
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} else {
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if (ix < 0x40038000) { /* |x| < 2.4375 */
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id = 2;
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x = (x - 1.5) / (1.0 + 1.5 * x);
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} else { /* 2.4375 <= |x| < 2^66 */
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id = 3;
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x = -1.0 / x;
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}
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}
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}
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/* end of argument reduction */
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z = x * x;
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w = z * z;
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/* break sum from i=0 to 10 aT[i]z**(i+1) into odd and even poly */
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s1 = z * (aT[0] + w * (aT[2] + w * (aT[4] + w * (aT[6] + w * (aT[8] + w * aT[10])))));
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s2 = w * (aT[1] + w * (aT[3] + w * (aT[5] + w * (aT[7] + w * aT[9]))));
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if (id < 0)
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return x - x * (s1 + s2);
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z = atanhi[id] - (x * (s1 + s2) - atanlo[id] - x);
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return sign ? -z : z;
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return atan( x );
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}
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#endif
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/*********************************************************************
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* exp (MSVCRT.@)
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@ -1254,7 +1254,7 @@
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@ cdecl asctime(ptr)
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@ cdecl asctime_s(ptr long ptr)
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@ cdecl asin(double) MSVCRT_asin
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@ cdecl atan(double)
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@ cdecl atan(double) MSVCRT_atan
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@ cdecl atan2(double double)
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@ cdecl -arch=!i386 asinf(float)
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@ cdecl -arch=!i386 atanf(float) MSVCRT_atanf
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