diff options
Diffstat (limited to 'lib/msun/src/k_sinf.c')
| -rw-r--r-- | lib/msun/src/k_sinf.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/lib/msun/src/k_sinf.c b/lib/msun/src/k_sinf.c index 12b8206..05df14e 100644 --- a/lib/msun/src/k_sinf.c +++ b/lib/msun/src/k_sinf.c @@ -1,5 +1,6 @@ /* k_sinf.c -- float version of k_sin.c * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + * Optimized by Bruce D. Evans. */ /* @@ -20,14 +21,13 @@ static char rcsid[] = "$FreeBSD$"; #include "math.h" #include "math_private.h" +/* Range of maximum relative error in polynomial: ~[-1.61e-10, 1.621e-10]. */ static const float -half = 5.0000000000e-01,/* 0x3f000000 */ -S1 = -1.6666667163e-01, /* 0xbe2aaaab */ -S2 = 8.3333337680e-03, /* 0x3c088889 */ -S3 = -1.9841270114e-04, /* 0xb9500d01 */ -S4 = 2.7557314297e-06, /* 0x3638ef1b */ -S5 = -2.5050759689e-08, /* 0xb2d72f34 */ -S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */ +half = 0.5, +S1 = -0xaaaaab.0p-26, /* -0.1666666716337203979492187500 */ +S2 = 0x8888ba.0p-30, /* 0.008333379402756690979003906250 */ +S3 = -0xd02cb0.0p-36, /* -0.0001985307317227125167846679687 */ +S4 = 0xbe18ff.0p-42; /* 0.000002832675590980215929448604584 */ float __kernel_sinf(float x, float y, int iy) @@ -36,7 +36,7 @@ __kernel_sinf(float x, float y, int iy) z = x*x; v = z*x; - r = S2+z*(S3+z*(S4+z*(S5+z*S6))); + r = S2+z*(S3+z*S4); if(iy==0) return x+v*(S1+z*r); else return x-((z*(half*y-v*r)-y)-v*S1); } |
