11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* s_floorf.c -- float version of s_floor.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_floorf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $"; 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * floorf(x) 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Return x rounded toward -inf to integral value 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Method: 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Bit twiddling. 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Exception: 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Inexact flag raised if x not equal to floorf(x). 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "math.h" 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "math_private.h" 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic const float huge = 1.0e30; 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectfloat 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectfloorf(float x) 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int32_t i0,j0; 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project u_int32_t i; 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project GET_FLOAT_WORD(i0,x); 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project j0 = ((i0>>23)&0xff)-0x7f; 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(j0<23) { 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(j0<0) { /* raise inexact if x != 0 */ 431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(i0>=0) {i0=0;} 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project else if((i0&0x7fffffff)!=0) 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project { i0=0xbf800000;} 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project i = (0x007fffff)>>j0; 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if((i0&i)==0) return x; /* x is integral */ 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(huge+x>(float)0.0) { /* raise inexact flag */ 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(i0<0) i0 += (0x00800000)>>j0; 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project i0 &= (~i); 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if(j0==0x80) return x+x; /* inf or NaN */ 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project else return x; /* x is integral */ 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project SET_FLOAT_WORD(x,i0); 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return x; 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 63