11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* e_acoshf.c -- float version of e_acosh.c. 21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ==================================================== 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Developed at SunPro, a Sun Microsystems, Inc. business. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Permission to use, copy, modify, and distribute this 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * software is freely granted, provided that this notice 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * is preserved. 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ==================================================== 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16a0ee07829a9ba7e99ef68e8c12551301cc797f0fElliott Hughes#include <sys/cdefs.h> 17a0ee07829a9ba7e99ef68e8c12551301cc797f0fElliott Hughes__FBSDID("$FreeBSD$"); 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "math.h" 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "math_private.h" 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic const float 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectone = 1.0, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectln2 = 6.9314718246e-01; /* 0x3f317218 */ 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectfloat 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project__ieee754_acoshf(float x) 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project float t; 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int32_t hx; 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project GET_FLOAT_WORD(hx,x); 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(hx<0x3f800000) { /* x < 1 */ 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (x-x)/(x-x); 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else if(hx >=0x4d800000) { /* x > 2**28 */ 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(hx >=0x7f800000) { /* x is inf of NaN */ 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return x+x; 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return __ieee754_logf(x)+ln2; /* acosh(huge)=log(2x) */ 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else if (hx==0x3f800000) { 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0.0; /* acosh(1) = 0 */ 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else if (hx > 0x40000000) { /* 2**28 > x > 2 */ 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project t=x*x; 431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return __ieee754_logf((float)2.0*x-one/(x+__ieee754_sqrtf(t-one))); 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { /* 1<x<2 */ 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project t = x-one; 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return log1pf(t+__ieee754_sqrtf((float)2.0*t+t*t)); 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 49