diff options
Diffstat (limited to 'lib/msun/src/e_acosf.c')
| -rw-r--r-- | lib/msun/src/e_acosf.c | 28 |
1 files changed, 11 insertions, 17 deletions
diff --git a/lib/msun/src/e_acosf.c b/lib/msun/src/e_acosf.c index 7fbf3b2..ac0d8dd 100644 --- a/lib/msun/src/e_acosf.c +++ b/lib/msun/src/e_acosf.c @@ -26,16 +26,10 @@ pio2_hi = 1.5707962513e+00; /* 0x3fc90fda */ static volatile float pio2_lo = 7.5497894159e-08; /* 0x33a22168 */ static const float -pS0 = 1.6666667163e-01, /* 0x3e2aaaab */ -pS1 = -3.2556581497e-01, /* 0xbea6b090 */ -pS2 = 2.0121252537e-01, /* 0x3e4e0aa8 */ -pS3 = -4.0055535734e-02, /* 0xbd241146 */ -pS4 = 7.9153501429e-04, /* 0x3a4f7f04 */ -pS5 = 3.4793309169e-05, /* 0x3811ef08 */ -qS1 = -2.4033949375e+00, /* 0xc019d139 */ -qS2 = 2.0209457874e+00, /* 0x4001572d */ -qS3 = -6.8828397989e-01, /* 0xbf303361 */ -qS4 = 7.7038154006e-02; /* 0x3d9dc62e */ +pS0 = 1.6666586697e-01, +pS1 = -4.2743422091e-02, +pS2 = -8.6563630030e-03, +qS1 = -7.0662963390e-01; float __ieee754_acosf(float x) @@ -51,16 +45,16 @@ __ieee754_acosf(float x) return (x-x)/(x-x); /* acos(|x|>1) is NaN */ } if(ix<0x3f000000) { /* |x| < 0.5 */ - if(ix<=0x23000000) return pio2_hi+pio2_lo;/*if|x|<2**-57*/ + if(ix<=0x32800000) return pio2_hi+pio2_lo;/*if|x|<2**-26*/ z = x*x; - p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*pS5))))); - q = one+z*(qS1+z*(qS2+z*(qS3+z*qS4))); + p = z*(pS0+z*(pS1+z*pS2)); + q = one+z*qS1; r = p/q; return pio2_hi - (x - (pio2_lo-x*r)); } else if (hx<0) { /* x < -0.5 */ z = (one+x)*(float)0.5; - p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*pS5))))); - q = one+z*(qS1+z*(qS2+z*(qS3+z*qS4))); + p = z*(pS0+z*(pS1+z*pS2)); + q = one+z*qS1; s = __ieee754_sqrtf(z); r = p/q; w = r*s-pio2_lo; @@ -73,8 +67,8 @@ __ieee754_acosf(float x) GET_FLOAT_WORD(idf,df); SET_FLOAT_WORD(df,idf&0xfffff000); c = (z-df*df)/(s+df); - p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*pS5))))); - q = one+z*(qS1+z*(qS2+z*(qS3+z*qS4))); + p = z*(pS0+z*(pS1+z*pS2)); + q = one+z*qS1; r = p/q; w = r*s+c; return (float)2.0*(df+w); |
