12116Sjkh/* s_scalbnf.c -- float version of s_scalbn.c. 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 32116Sjkh */ 42116Sjkh 52116Sjkh/* 62116Sjkh * ==================================================== 72116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 82116Sjkh * 92116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 102116Sjkh * Permission to use, copy, modify, and distribute this 118870Srgrimes * software is freely granted, provided that this notice 122116Sjkh * is preserved. 132116Sjkh * ==================================================== 142116Sjkh */ 152116Sjkh 16143205Sdas#include <sys/cdefs.h> 17324006Sdim__FBSDID("$FreeBSD: stable/11/lib/msun/src/s_scalbnf.c 324006 2017-09-26 09:01:56Z dim $"); 18143205Sdas 192116Sjkh#include "math.h" 202116Sjkh#include "math_private.h" 212116Sjkh 222116Sjkhstatic const float 232116Sjkhtwo25 = 3.355443200e+07, /* 0x4c000000 */ 242116Sjkhtwom25 = 2.9802322388e-08, /* 0x33000000 */ 252116Sjkhhuge = 1.0e+30, 262116Sjkhtiny = 1.0e-30; 272116Sjkh 2897413Salfredfloat 2997413Salfredscalbnf (float x, int n) 302116Sjkh{ 312116Sjkh int32_t k,ix; 322116Sjkh GET_FLOAT_WORD(ix,x); 332116Sjkh k = (ix&0x7f800000)>>23; /* extract exponent */ 342116Sjkh if (k==0) { /* 0 or subnormal x */ 352116Sjkh if ((ix&0x7fffffff)==0) return x; /* +-0 */ 362116Sjkh x *= two25; 372116Sjkh GET_FLOAT_WORD(ix,x); 388870Srgrimes k = ((ix&0x7f800000)>>23) - 25; 392116Sjkh if (n< -50000) return tiny*x; /*underflow*/ 402116Sjkh } 412116Sjkh if (k==0xff) return x+x; /* NaN or Inf */ 428870Srgrimes k = k+n; 432116Sjkh if (k > 0xfe) return huge*copysignf(huge,x); /* overflow */ 442116Sjkh if (k > 0) /* normal result */ 452116Sjkh {SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x;} 46324006Sdim if (k <= -25) { 472116Sjkh if (n > 50000) /* in case integer overflow in n+k */ 482116Sjkh return huge*copysignf(huge,x); /*overflow*/ 49324006Sdim else 50324006Sdim return tiny*copysignf(tiny,x); /*underflow*/ 51324006Sdim } 522116Sjkh k += 25; /* subnormal result */ 532116Sjkh SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); 542116Sjkh return x*twom25; 552116Sjkh} 56143205Sdas 57143205Sdas__strong_reference(scalbnf, ldexpf); 58