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annotate libquadmath/math/floorq.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 561a7518be6b
children 1830386684a0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
111
kono
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1 /* floorq.c -- __float128 version of s_floor.c.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4
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5 /*
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6 * ====================================================
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 *
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 * Developed at SunPro, a Sun Microsystems, Inc. business.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 * Permission to use, copy, modify, and distribute this
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11 * software is freely granted, provided that this notice
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12 * is preserved.
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13 * ====================================================
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 */
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15
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16 #include "quadmath-imp.h"
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17
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 __float128
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 floorq (__float128 x)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 int64_t i0,i1,j0;
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22 uint64_t i,j;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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23 GET_FLT128_WORDS64(i0,i1,x);
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24 j0 = ((i0>>48)&0x7fff)-0x3fff;
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25 if(j0<48) {
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26 if(j0<0) {
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27 /* return 0*sign(x) if |x|<1 */
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28 if(i0>=0) {i0=i1=0;}
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29 else if(((i0&0x7fffffffffffffffLL)|i1)!=0)
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30 { i0=0xbfff000000000000ULL;i1=0;}
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31 } else {
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32 i = (0x0000ffffffffffffULL)>>j0;
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33 if(((i0&i)|i1)==0) return x; /* x is integral */
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34 if(i0<0) i0 += (0x0001000000000000LL)>>j0;
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35 i0 &= (~i); i1=0;
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36 }
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37 } else if (j0>111) {
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38 if(j0==0x4000) return x+x; /* inf or NaN */
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39 else return x; /* x is integral */
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40 } else {
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41 i = -1ULL>>(j0-48);
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42 if((i1&i)==0) return x; /* x is integral */
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43 if(i0<0) {
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44 if(j0==48) i0+=1;
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45 else {
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46 j = i1+(1LL<<(112-j0));
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47 if(j<i1) i0 +=1 ; /* got a carry */
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48 i1=j;
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49 }
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50 }
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51 i1 &= (~i);
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52 }
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53 SET_FLT128_WORDS64(x,i0,i1);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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54 return x;
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55 }