kc3-lang/SDL/src/libm/s_floor.c

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• Hash : 1a02403e
  Author :
  Date : 2018-11-18T11:50:20
  

  libm: Watcom defines huge=__huge: undefine it to fix build using Watcom.

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• src/libm/s_floor.c

• /*
   * ====================================================
   * 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.
   * ====================================================
   */
  
  /*
   * floor(x)
   * Return x rounded toward -inf to integral value
   * Method:
   *	Bit twiddling.
   * Exception:
   *	Inexact flag raised if x not equal to floor(x).
   */
  
  /*#include <features.h>*/
  /* Prevent math.h from defining a colliding inline */
  #undef __USE_EXTERN_INLINES
  #include "math_libm.h"
  #include "math_private.h"
  
  #ifdef __WATCOMC__ /* Watcom defines huge=__huge */
  #undef huge
  #endif
  
  static const double huge = 1.0e300;
  
  double floor(double x)
  {
  	int32_t i0,i1,j0;
  	u_int32_t i,j;
  	EXTRACT_WORDS(i0,i1,x);
  	j0 = ((i0>>20)&0x7ff)-0x3ff;
  	if(j0<20) {
  	    if(j0<0) { 	/* raise inexact if x != 0 */
  		if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
  		    if(i0>=0) {i0=i1=0;}
  		    else if(((i0&0x7fffffff)|i1)!=0)
  			{ i0=0xbff00000;i1=0;}
  		}
  	    } else {
  		i = (0x000fffff)>>j0;
  		if(((i0&i)|i1)==0) return x; /* x is integral */
  		if(huge+x>0.0) {	/* raise inexact flag */
  		    if(i0<0) i0 += (0x00100000)>>j0;
  		    i0 &= (~i); i1=0;
  		}
  	    }
  	} else if (j0>51) {
  	    if(j0==0x400) return x+x;	/* inf or NaN */
  	    else return x;		/* x is integral */
  	} else {
  	    i = ((u_int32_t)(0xffffffff))>>(j0-20);
  	    if((i1&i)==0) return x;	/* x is integral */
  	    if(huge+x>0.0) { 		/* raise inexact flag */
  		if(i0<0) {
  		    if(j0==20) i0+=1;
  		    else {
  			j = i1+(1<<(52-j0));
  			if(j<(u_int32_t)i1) i0 +=1 ; 	/* got a carry */
  			i1=j;
  		    }
  		}
  		i1 &= (~i);
  	    }
  	}
  	INSERT_WORDS(x,i0,i1);
  	return x;
  }
  libm_hidden_def(floor)
  

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