11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* s_scalbnf.c -- float version of s_scalbn.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 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#ifndef lint 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic char rcsid[] = "$FreeBSD: src/lib/msun/src/s_scalbnf.c,v 1.8 2005/03/07 04:52:43 das Exp $"; 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/cdefs.h> 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "math.h" 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "math_private.h" 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic const float 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projecttwo25 = 3.355443200e+07, /* 0x4c000000 */ 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projecttwom25 = 2.9802322388e-08, /* 0x33000000 */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projecthuge = 1.0e+30, 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projecttiny = 1.0e-30; 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectfloat 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectscalbnf (float x, int n) 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int32_t k,ix; 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project GET_FLOAT_WORD(ix,x); 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project k = (ix&0x7f800000)>>23; /* extract exponent */ 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (k==0) { /* 0 or subnormal x */ 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if ((ix&0x7fffffff)==0) return x; /* +-0 */ 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project x *= two25; 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project GET_FLOAT_WORD(ix,x); 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project k = ((ix&0x7f800000)>>23) - 25; 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (n< -50000) return tiny*x; /*underflow*/ 431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (k==0xff) return x+x; /* NaN or Inf */ 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project k = k+n; 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (k > 0xfe) return huge*copysignf(huge,x); /* overflow */ 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (k > 0) /* normal result */ 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project {SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x;} 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (k <= -25) 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (n > 50000) /* in case integer overflow in n+k */ 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return huge*copysignf(huge,x); /*overflow*/ 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project else return tiny*copysignf(tiny,x); /*underflow*/ 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project k += 25; /* subnormal result */ 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return x*twom25; 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project__strong_reference(scalbnf, ldexpf); 59