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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/cosf.c | |
| parent | 69ee9b2cb169ee843ac9e209f919d088499152f7 (diff) | |
| parent | bfda37935867f9bf271d6074db0accf05c63ad10 (diff) | |
| download | musl-83af1dd65a11f3da3f99ba861248a841c402ccaa.tar.gz musl-83af1dd65a11f3da3f99ba861248a841c402ccaa.tar.bz2 musl-83af1dd65a11f3da3f99ba861248a841c402ccaa.tar.xz musl-83af1dd65a11f3da3f99ba861248a841c402ccaa.zip | |
Merge remote-tracking branch 'nsz/review'
Diffstat (limited to 'src/math/cosf.c')
| -rw-r--r-- | src/math/cosf.c | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/src/math/cosf.c b/src/math/cosf.c index 4d94130f..23f3e5bf 100644 --- a/src/math/cosf.c +++ b/src/math/cosf.c @@ -26,34 +26,39 @@ c4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ float cosf(float x) { double y; - int32_t n, hx, ix; + uint32_t ix; + unsigned n, sign; + + GET_FLOAT_WORD(ix, x); + sign = ix >> 31; + ix &= 0x7fffffff; - GET_FLOAT_WORD(hx, x); - ix = hx & 0x7fffffff; if (ix <= 0x3f490fda) { /* |x| ~<= pi/4 */ - if (ix < 0x39800000) /* |x| < 2**-12 */ - if ((int)x == 0) /* raise inexact if x != 0 */ - return 1.0; + if (ix < 0x39800000) { /* |x| < 2**-12 */ + /* raise inexact if x != 0 */ + FORCE_EVAL(x + 0x1p120f); + return 1.0f; + } return __cosdf(x); } if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */ if (ix > 0x4016cbe3) /* |x| ~> 3*pi/4 */ - return -__cosdf(hx > 0 ? x-c2pio2 : x+c2pio2); + return -__cosdf(sign ? x+c2pio2 : x-c2pio2); else { - if (hx > 0) - return __sindf(c1pio2 - x); - else + if (sign) return __sindf(x + c1pio2); + else + return __sindf(c1pio2 - x); } } if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */ if (ix > 0x40afeddf) /* |x| ~> 7*pi/4 */ - return __cosdf(hx > 0 ? x-c4pio2 : x+c4pio2); + return __cosdf(sign ? x+c4pio2 : x-c4pio2); else { - if (hx > 0) - return __sindf(x - c3pio2); + if (sign) + return __sindf(-x - c3pio2); else - return __sindf(-c3pio2 - x); + return __sindf(x - c3pio2); } } |