2014-09-21 17:33:12 +00:00
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/* floorq.c -- __float128 version of s_floor.c.
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2012-03-27 23:13:14 +00:00
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* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include "quadmath-imp.h"
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static const __float128 huge = 1.0e4930Q;
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__float128
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floorq (__float128 x)
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{
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int64_t i0,i1,j0;
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uint64_t i,j;
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GET_FLT128_WORDS64(i0,i1,x);
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j0 = ((i0>>48)&0x7fff)-0x3fff;
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if(j0<48) {
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if(j0<0) { /* raise inexact if x != 0 */
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if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
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if(i0>=0) {i0=i1=0;}
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else if(((i0&0x7fffffffffffffffLL)|i1)!=0)
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{ i0=0xbfff000000000000ULL;i1=0;}
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}
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} else {
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i = (0x0000ffffffffffffULL)>>j0;
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if(((i0&i)|i1)==0) return x; /* x is integral */
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if(huge+x>0.0) { /* raise inexact flag */
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if(i0<0) i0 += (0x0001000000000000LL)>>j0;
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i0 &= (~i); i1=0;
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}
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}
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} else if (j0>111) {
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if(j0==0x4000) return x+x; /* inf or NaN */
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else return x; /* x is integral */
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} else {
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i = -1ULL>>(j0-48);
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if((i1&i)==0) return x; /* x is integral */
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if(huge+x>0.0) { /* raise inexact flag */
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if(i0<0) {
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if(j0==48) i0+=1;
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else {
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j = i1+(1LL<<(112-j0));
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if(j<i1) i0 +=1 ; /* got a carry */
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i1=j;
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}
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}
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i1 &= (~i);
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}
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}
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SET_FLT128_WORDS64(x,i0,i1);
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return x;
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}
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