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| author | Rich Felker <dalias@aerifal.cx> | 2013-05-18 12:06:42 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2013-05-18 12:06:42 -0400 |
| commit | 83af1dd65a11f3da3f99ba861248a841c402ccaa (patch) | |
| tree | dece0960d64fb52abcf7a8195bf5082523cea70b /src/math/sin.c | |
| parent | make err.h functions print __progname (diff) | |
| parent | math: sin cos cleanup (diff) | |
| download | grovel-83af1dd65a11f3da3f99ba861248a841c402ccaa.tar.gz grovel-83af1dd65a11f3da3f99ba861248a841c402ccaa.tar.xz | |
Merge remote-tracking branch 'nsz/review'
Diffstat (limited to 'src/math/sin.c')
| -rw-r--r-- | src/math/sin.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/src/math/sin.c b/src/math/sin.c index 8e430f85..055e215b 100644 --- a/src/math/sin.c +++ b/src/math/sin.c @@ -44,21 +44,22 @@ double sin(double x) { - double y[2], z=0.0; - int32_t n, ix; + double y[2]; + uint32_t ix; + unsigned n; /* High word of x. */ GET_HIGH_WORD(ix, x); + ix &= 0x7fffffff; /* |x| ~< pi/4 */ - ix &= 0x7fffffff; if (ix <= 0x3fe921fb) { if (ix < 0x3e500000) { /* |x| < 2**-26 */ - /* raise inexact if x != 0 */ - if ((int)x == 0) - return x; + /* raise inexact if x != 0 and underflow if subnormal*/ + FORCE_EVAL(ix < 0x00100000 ? x/0x1p120f : x+0x1p120f); + return x; } - return __sin(x, z, 0); + return __sin(x, 0.0, 0); } /* sin(Inf or NaN) is NaN */ |