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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
| commit | 0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch) | |
| tree | f9d26c8abc0de39d18d4c13e70f6022cdc6b461f /sysdeps/ieee754/ldbl-128/e_atan2l.c | |
| parent | a843a204a3e8a0dd53584dad3668771abaec84ac (diff) | |
| download | glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.gz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.xz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.zip | |
Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/e_atan2l.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/e_atan2l.c | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/sysdeps/ieee754/ldbl-128/e_atan2l.c b/sysdeps/ieee754/ldbl-128/e_atan2l.c index 2bbb3b8f49..bba3c9bcf1 100644 --- a/sysdeps/ieee754/ldbl-128/e_atan2l.c +++ b/sysdeps/ieee754/ldbl-128/e_atan2l.c @@ -17,7 +17,7 @@ * Method : * 1. Reduce y to positive by atan2l(y,x)=-atan2l(-y,x). * 2. Reduce x to positive by (if x and y are unexceptional): - * ARG (x+iy) = arctan(y/x) ... if x > 0, + * ARG (x+iy) = arctan(y/x) ... if x > 0, * ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0, * * Special cases: @@ -43,11 +43,7 @@ #include "math.h" #include "math_private.h" -#ifdef __STDC__ static const long double -#else -static long double -#endif tiny = 1.0e-4900L, zero = 0.0, pi_o_4 = 7.85398163397448309615660845819875699e-01L, /* 3ffe921fb54442d18469898cc51701b8 */ @@ -55,12 +51,8 @@ pi_o_2 = 1.57079632679489661923132169163975140e+00L, /* 3fff921fb54442d18469898 pi = 3.14159265358979323846264338327950280e+00L, /* 4000921fb54442d18469898cc51701b8 */ pi_lo = 8.67181013012378102479704402604335225e-35L; /* 3f8dcd129024e088a67cc74020bbea64 */ -#ifdef __STDC__ - long double __ieee754_atan2l(long double y, long double x) -#else - long double __ieee754_atan2l(y,x) - long double y,x; -#endif +long double +__ieee754_atan2l(long double y, long double x) { long double z; int64_t k,m,hx,hy,ix,iy; @@ -80,7 +72,7 @@ pi_lo = 8.67181013012378102479704402604335225e-35L; /* 3f8dcd129024e088a67cc74 if((iy|ly)==0) { switch(m) { case 0: - case 1: return y; /* atan(+-0,+anything)=+-0 */ + case 1: return y; /* atan(+-0,+anything)=+-0 */ case 2: return pi+tiny;/* atan(+0,-anything) = pi */ case 3: return -pi-tiny;/* atan(-0,-anything) =-pi */ } @@ -111,19 +103,20 @@ pi_lo = 8.67181013012378102479704402604335225e-35L; /* 3f8dcd129024e088a67cc74 /* compute y/x */ k = (iy-ix)>>48; - if(k > 120) z=pi_o_2+0.5L*pi_lo; /* |y/x| > 2**120 */ - else if(hx<0&&k<-120) z=0.0L; /* |y|/x < -2**120 */ + if(k > 120) z=pi_o_2+0.5L*pi_lo; /* |y/x| > 2**120 */ + else if(hx<0&&k<-120) z=0.0L; /* |y|/x < -2**120 */ else z=__atanl(fabsl(y/x)); /* safe to do y/x */ switch (m) { case 0: return z ; /* atan(+,+) */ case 1: { - u_int64_t zh; + u_int64_t zh; GET_LDOUBLE_MSW64(zh,z); SET_LDOUBLE_MSW64(z,zh ^ 0x8000000000000000ULL); } return z ; /* atan(-,+) */ case 2: return pi-(z-pi_lo);/* atan(+,-) */ default: /* case 3 */ - return (z-pi_lo)-pi;/* atan(-,-) */ + return (z-pi_lo)-pi;/* atan(-,-) */ } } +strong_alias (__ieee754_atan2l, __atan2l_finite) |