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msvcrt: Use the atan2()/atan2f() implementation from the bundled musl library.
This commit is contained in:
Alexandre Julliard
parent
03bdd6d52d
commit
6148bf503b
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@ -797,77 +797,6 @@ float CDECL atanf( float x )
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return sign ? -z : z;
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}
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/*********************************************************************
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* atan2f (MSVCRT.@)
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*
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* Copied from musl: src/math/atan2f.c
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*/
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float CDECL atan2f( float y, float x )
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{
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static const float pi = 3.1415927410e+00,
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pi_lo = -8.7422776573e-08;
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float z;
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unsigned int m, ix, iy;
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if (isnan(x) || isnan(y))
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return x + y;
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ix = *(unsigned int*)&x;
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iy = *(unsigned int*)&y;
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if (ix == 0x3f800000) /* x=1.0 */
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return atanf(y);
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m = ((iy >> 31) & 1) | ((ix >> 30) & 2); /* 2*sign(x)+sign(y) */
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ix &= 0x7fffffff;
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iy &= 0x7fffffff;
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/* when y = 0 */
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if (iy == 0) {
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switch (m) {
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case 0:
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case 1: return y; /* atan(+-0,+anything)=+-0 */
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case 2: return pi; /* atan(+0,-anything) = pi */
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case 3: return -pi; /* atan(-0,-anything) =-pi */
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}
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}
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/* when x = 0 */
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if (ix == 0)
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return m & 1 ? -pi / 2 : pi / 2;
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/* when x is INF */
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if (ix == 0x7f800000) {
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if (iy == 0x7f800000) {
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switch (m) {
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case 0: return pi / 4; /* atan(+INF,+INF) */
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case 1: return -pi / 4; /* atan(-INF,+INF) */
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case 2: return 3 * pi / 4; /*atan(+INF,-INF)*/
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case 3: return -3 * pi / 4; /*atan(-INF,-INF)*/
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}
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} else {
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switch (m) {
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case 0: return 0.0f; /* atan(+...,+INF) */
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case 1: return -0.0f; /* atan(-...,+INF) */
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case 2: return pi; /* atan(+...,-INF) */
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case 3: return -pi; /* atan(-...,-INF) */
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}
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}
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}
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/* |y/x| > 0x1p26 */
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if (ix + (26 << 23) < iy || iy == 0x7f800000)
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return m & 1 ? -pi / 2 : pi / 2;
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/* z = atan(|y/x|) with correct underflow */
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if ((m & 2) && iy + (26 << 23) < ix) /*|y/x| < 0x1p-26, x < 0 */
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z = 0.0;
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else
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z = atanf(fabsf(y / x));
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switch (m) {
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case 0: return z; /* atan(+,+) */
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case 1: return -z; /* atan(-,+) */
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case 2: return pi - (z - pi_lo); /* atan(+,-) */
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default: /* case 3 */
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return (z - pi_lo) - pi; /* atan(-,-) */
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}
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}
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/* Copied from musl: src/math/__rem_pio2f.c */
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static int __rem_pio2f(float x, double *y)
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{
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@ -1822,79 +1751,6 @@ double CDECL atan( double x )
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return sign ? -z : z;
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}
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/*********************************************************************
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* atan2 (MSVCRT.@)
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*
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* Copied from musl: src/math/atan2.c
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*/
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double CDECL atan2( double y, double x )
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{
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static const double pi = 3.1415926535897931160E+00,
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pi_lo = 1.2246467991473531772E-16;
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double z;
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unsigned int m, lx, ly, ix, iy;
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if (isnan(x) || isnan(y))
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return x+y;
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ix = *(ULONGLONG*)&x >> 32;
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lx = *(ULONGLONG*)&x;
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iy = *(ULONGLONG*)&y >> 32;
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ly = *(ULONGLONG*)&y;
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if (((ix - 0x3ff00000) | lx) == 0) /* x = 1.0 */
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return atan(y);
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m = ((iy >> 31) & 1) | ((ix >> 30) & 2); /* 2*sign(x)+sign(y) */
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ix = ix & 0x7fffffff;
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iy = iy & 0x7fffffff;
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/* when y = 0 */
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if ((iy | ly) == 0) {
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switch(m) {
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case 0:
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case 1: return y; /* atan(+-0,+anything)=+-0 */
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case 2: return pi; /* atan(+0,-anything) = pi */
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case 3: return -pi; /* atan(-0,-anything) =-pi */
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}
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}
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/* when x = 0 */
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if ((ix | lx) == 0)
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return m & 1 ? -pi / 2 : pi / 2;
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/* when x is INF */
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if (ix == 0x7ff00000) {
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if (iy == 0x7ff00000) {
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switch(m) {
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case 0: return pi / 4; /* atan(+INF,+INF) */
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case 1: return -pi / 4; /* atan(-INF,+INF) */
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case 2: return 3 * pi / 4; /* atan(+INF,-INF) */
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case 3: return -3 * pi / 4; /* atan(-INF,-INF) */
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}
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} else {
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switch(m) {
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case 0: return 0.0; /* atan(+...,+INF) */
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case 1: return -0.0; /* atan(-...,+INF) */
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case 2: return pi; /* atan(+...,-INF) */
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case 3: return -pi; /* atan(-...,-INF) */
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}
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}
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}
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/* |y/x| > 0x1p64 */
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if (ix + (64 << 20) < iy || iy == 0x7ff00000)
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return m & 1 ? -pi / 2 : pi / 2;
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/* z = atan(|y/x|) without spurious underflow */
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if ((m & 2) && iy + (64 << 20) < ix) /* |y/x| < 0x1p-64, x<0 */
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z = 0;
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else
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z = atan(fabs(y / x));
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switch (m) {
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case 0: return z; /* atan(+,+) */
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case 1: return -z; /* atan(-,+) */
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case 2: return pi - (z - pi_lo); /* atan(+,-) */
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default: /* case 3 */
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return (z - pi_lo) - pi; /* atan(-,-) */
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}
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}
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/* Copied from musl: src/math/rint.c */
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static double __rint(double x)
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{
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