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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/flt-32/e_atan2f.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/flt-32/e_atan2f.c')
| -rw-r--r-- | sysdeps/ieee754/flt-32/e_atan2f.c | 27 |
1 files changed, 8 insertions, 19 deletions
diff --git a/sysdeps/ieee754/flt-32/e_atan2f.c b/sysdeps/ieee754/flt-32/e_atan2f.c index c0cafb16b8..abbde88bdf 100644 --- a/sysdeps/ieee754/flt-32/e_atan2f.c +++ b/sysdeps/ieee754/flt-32/e_atan2f.c @@ -13,18 +13,10 @@ * ==================================================== */ -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: e_atan2f.c,v 1.4 1995/05/10 20:44:53 jtc Exp $"; -#endif - #include "math.h" #include "math_private.h" -#ifdef __STDC__ static const float -#else -static float -#endif tiny = 1.0e-30, zero = 0.0, pi_o_4 = 7.8539818525e-01, /* 0x3f490fdb */ @@ -32,12 +24,8 @@ pi_o_2 = 1.5707963705e+00, /* 0x3fc90fdb */ pi = 3.1415927410e+00, /* 0x40490fdb */ pi_lo = -8.7422776573e-08; /* 0xb3bbbd2e */ -#ifdef __STDC__ - float __ieee754_atan2f(float y, float x) -#else - float __ieee754_atan2f(y,x) - float y,x; -#endif +float +__ieee754_atan2f (float y, float x) { float z; int32_t k,m,hx,hy,ix,iy; @@ -56,7 +44,7 @@ pi_lo = -8.7422776573e-08; /* 0xb3bbbd2e */ if(iy==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 */ } @@ -87,19 +75,20 @@ pi_lo = -8.7422776573e-08; /* 0xb3bbbd2e */ /* compute y/x */ k = (iy-ix)>>23; - if(k > 60) z=pi_o_2+(float)0.5*pi_lo; /* |y/x| > 2**60 */ - else if(hx<0&&k<-60) z=0.0; /* |y|/x < -2**60 */ + if(k > 60) z=pi_o_2+(float)0.5*pi_lo; /* |y/x| > 2**60 */ + else if(hx<0&&k<-60) z=0.0; /* |y|/x < -2**60 */ else z=__atanf(fabsf(y/x)); /* safe to do y/x */ switch (m) { case 0: return z ; /* atan(+,+) */ case 1: { - u_int32_t zh; + u_int32_t zh; GET_FLOAT_WORD(zh,z); SET_FLOAT_WORD(z,zh ^ 0x80000000); } 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_atan2f, __atan2f_finite) |