#include "libm.h"
static const float
-one = 1.0000000000e+00, /* 0x3F800000 */
-pi = 3.1415925026e+00, /* 0x40490fda */
+pi = 3.1415925026e+00, /* 0x40490fda */
pio2_hi = 1.5707962513e+00; /* 0x3fc90fda */
-static volatile float
+static const volatile float
pio2_lo = 7.5497894159e-08; /* 0x33a22168 */
static const float
pS0 = 1.6666586697e-01,
ix = hx & 0x7fffffff;
if (ix >= 0x3f800000) { /* |x| >= 1 */
if (ix == 0x3f800000) { /* |x| == 1 */
- if(hx>0) return 0.0; /* acos(1) = 0 */
- return pi + (float)2.0*pio2_lo; /* acos(-1)= pi */
+ if (hx > 0) return 0.0f; /* acos(1) = 0 */
+ return pi + 2.0f*pio2_lo; /* acos(-1)= pi */
}
return (x-x)/(x-x); /* acos(|x|>1) is NaN */
}
return pio2_hi + pio2_lo;
z = x*x;
p = z*(pS0+z*(pS1+z*pS2));
- q = one+z*qS1;
+ q = 1.0f+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;
+ z = (1.0f+x)*0.5f;
p = z*(pS0+z*(pS1+z*pS2));
- q = one+z*qS1;
+ q = 1.0f+z*qS1;
s = sqrtf(z);
r = p/q;
w = r*s-pio2_lo;
- return pi - (float)2.0*(s+w);
+ return pi - 2.0f*(s+w);
} else { /* x > 0.5 */
int32_t idf;
- z = (one-x)*(float)0.5;
+ z = (1.0f-x)*0.5f;
s = sqrtf(z);
df = s;
GET_FLOAT_WORD(idf,df);
SET_FLOAT_WORD(df,idf&0xfffff000);
c = (z-df*df)/(s+df);
p = z*(pS0+z*(pS1+z*pS2));
- q = one+z*qS1;
+ q = 1.0f+z*qS1;
r = p/q;
w = r*s+c;
- return (float)2.0*(df+w);
+ return 2.0f*(df+w);
}
}