diff options
Diffstat (limited to 'libquadmath/math/atan2q.c')
| -rw-r--r-- | libquadmath/math/atan2q.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/libquadmath/math/atan2q.c b/libquadmath/math/atan2q.c index daa303efba3..07dd28fd0c5 100644 --- a/libquadmath/math/atan2q.c +++ b/libquadmath/math/atan2q.c @@ -1,4 +1,4 @@ -/* atan2q.c -- __float128 version of e_atan2.c. +/* e_atan2l.c -- long double version of e_atan2.c. * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz. */ @@ -15,9 +15,9 @@ /* atan2q(y,x) * Method : - * 1. Reduce y to positive by atan2q(y,x)=-atan2q(-y,x). + * 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: @@ -51,7 +51,7 @@ pi = 3.14159265358979323846264338327950280e+00Q, /* 4000921fb54442d18469898 pi_lo = 8.67181013012378102479704402604335225e-35Q; /* 3f8dcd129024e088a67cc74020bbea64 */ __float128 -atan2q (__float128 y, __float128 x) +atan2q(__float128 y, __float128 x) { __float128 z; int64_t k,m,hx,hy,ix,iy; @@ -64,14 +64,14 @@ atan2q (__float128 y, __float128 x) if(((ix|((lx|-lx)>>63))>0x7fff000000000000LL)|| ((iy|((ly|-ly)>>63))>0x7fff000000000000LL)) /* x or y is NaN */ return x+y; - if(((hx-0x3fff000000000000LL)|lx)==0) return atanq(y); /* x=1.0Q */ + if(((hx-0x3fff000000000000LL)|lx)==0) return atanq(y); /* x=1.0L */ m = ((hy>>63)&1)|((hx>>62)&2); /* 2*sign(x)+sign(y) */ /* when y = 0 */ 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 */ } @@ -85,8 +85,8 @@ atan2q (__float128 y, __float128 x) switch(m) { case 0: return pi_o_4+tiny;/* atan(+INF,+INF) */ case 1: return -pi_o_4-tiny;/* atan(-INF,+INF) */ - case 2: return 3.0Q*pi_o_4+tiny;/*atan(+INF,-INF)*/ - case 3: return -3.0Q*pi_o_4-tiny;/*atan(-INF,-INF)*/ + case 2: return 3*pi_o_4+tiny;/*atan(+INF,-INF)*/ + case 3: return -3*pi_o_4-tiny;/*atan(-INF,-INF)*/ } } else { switch(m) { @@ -102,19 +102,19 @@ atan2q (__float128 y, __float128 x) /* compute y/x */ k = (iy-ix)>>48; - if(k > 120) z=pi_o_2+0.5Q*pi_lo; /* |y/x| > 2**120 */ - else if(hx<0&&k<-120) z=0.0Q; /* |y|/x < -2**120 */ + if(k > 120) z=pi_o_2+0.5Q*pi_lo; /* |y/x| > 2**120 */ + else if(hx<0&&k<-120) z=0; /* |y|/x < -2**120 */ else z=atanq(fabsq(y/x)); /* safe to do y/x */ switch (m) { case 0: return z ; /* atan(+,+) */ case 1: { - uint64_t zh; + uint64_t zh; GET_FLT128_MSW64(zh,z); SET_FLT128_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(-,-) */ } } |