kc3-lang/libquadmath/math/floorq.c

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• Hash : 4f659ab9
  Author : Thomas de Grivel
  Date : 2025-11-02T19:33:45
  

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• math/floorq.c

• /* s_floorl.c -- long double version of s_floor.c.
   * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
   */
  
  /*
   * ====================================================
   * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   *
   * Developed at SunPro, a Sun Microsystems, Inc. business.
   * Permission to use, copy, modify, and distribute this
   * software is freely granted, provided that this notice
   * is preserved.
   * ====================================================
   */
  
  #if defined(LIBM_SCCS) && !defined(lint)
  static char rcsid[] = "$NetBSD: $";
  #endif
  
  /*
   * floorq(x)
   * Return x rounded toward -inf to integral value
   * Method:
   *	Bit twiddling.
   */
  
  #define NO_MATH_REDIRECT
  
  #include "quadmath-imp.h"
  
  __float128 floorq(__float128 x)
  {
  	int64_t i0,i1,j0;
  	uint64_t i,j;
  	GET_FLT128_WORDS64(i0,i1,x);
  	j0 = ((i0>>48)&0x7fff)-0x3fff;
  	if(j0<48) {
  	    if(j0<0) {
  		/* return 0*sign(x) if |x|<1 */
  		if(i0>=0) {i0=i1=0;}
  		else if(((i0&0x7fffffffffffffffLL)|i1)!=0)
  		    { i0=0xbfff000000000000ULL;i1=0;}
  	    } else {
  		i = (0x0000ffffffffffffULL)>>j0;
  		if(((i0&i)|i1)==0) return x; /* x is integral */
  		if(i0<0) i0 += (0x0001000000000000LL)>>j0;
  		i0 &= (~i); i1=0;
  	    }
  	} else if (j0>111) {
  	    if(j0==0x4000) return x+x;	/* inf or NaN */
  	    else return x;		/* x is integral */
  	} else {
  	    i = -1ULL>>(j0-48);
  	    if((i1&i)==0) return x;	/* x is integral */
  	    if(i0<0) {
  		if(j0==48) i0+=1;
  		else {
  		    j = i1+(1LL<<(112-j0));
  		    if(j<i1) i0 +=1 ; 	/* got a carry */
  		    i1=j;
  		}
  	    }
  	    i1 &= (~i);
  	}
  	SET_FLT128_WORDS64(x,i0,i1);
  	return x;
  }
  

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