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comparison libquadmath/math/frexpq.c @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
parents 04ced10e8804
children
comparison
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131:84e7813d76e9 145:1830386684a0
1 /* frexpq.c -- __float128 version of s_frexp.c. 1 /* s_frexpl.c -- long double version of s_frexp.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. 2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
3 */ 3 */
4 4
5 /* 5 /*
6 * ==================================================== 6 * ====================================================
11 * software is freely granted, provided that this notice 11 * software is freely granted, provided that this notice
12 * is preserved. 12 * is preserved.
13 * ==================================================== 13 * ====================================================
14 */ 14 */
15 15
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: $";
18 #endif
19
16 /* 20 /*
17 * for non-zero x 21 * for non-zero x
18 * x = frexpq(arg,&exp); 22 * x = frexpq(arg,&exp);
19 * return a __float128 fp quantity x such that 0.5 <= |x| <1.0 23 * return a long double fp quantity x such that 0.5 <= |x| <1.0
20 * and the corresponding binary exponent "exp". That is 24 * and the corresponding binary exponent "exp". That is
21 * arg = x*2^exp. 25 * arg = x*2^exp.
22 * If arg is inf, 0.0, or NaN, then frexpq(arg,&exp) returns arg 26 * If arg is inf, 0.0, or NaN, then frexpq(arg,&exp) returns arg
23 * with *exp=0. 27 * with *exp=0.
24 */ 28 */
26 #include "quadmath-imp.h" 30 #include "quadmath-imp.h"
27 31
28 static const __float128 32 static const __float128
29 two114 = 2.0769187434139310514121985316880384E+34Q; /* 0x4071000000000000, 0 */ 33 two114 = 2.0769187434139310514121985316880384E+34Q; /* 0x4071000000000000, 0 */
30 34
31 __float128 35 __float128 frexpq(__float128 x, int *eptr)
32 frexpq (__float128 x, int *eptr)
33 { 36 {
34 uint64_t hx, lx, ix; 37 uint64_t hx, lx, ix;
35 GET_FLT128_WORDS64(hx,lx,x); 38 GET_FLT128_WORDS64(hx,lx,x);
36 ix = 0x7fffffffffffffffULL&hx; 39 ix = 0x7fffffffffffffffULL&hx;
37 *eptr = 0; 40 *eptr = 0;
38 if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */ 41 if(ix>=0x7fff000000000000ULL||((ix|lx)==0)) return x + x;/* 0,inf,nan */
39 if (ix<0x0001000000000000ULL) { /* subnormal */ 42 if (ix<0x0001000000000000ULL) { /* subnormal */
40 x *= two114; 43 x *= two114;
41 GET_FLT128_MSW64(hx,x); 44 GET_FLT128_MSW64(hx,x);
42 ix = hx&0x7fffffffffffffffULL; 45 ix = hx&0x7fffffffffffffffULL;
43 *eptr = -114; 46 *eptr = -114;
44 } 47 }
45 *eptr += (ix>>48)-16382; 48 *eptr += (ix>>48)-16382;
46 hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL; 49 hx = (hx&0x8000ffffffffffffULL) | 0x3ffe000000000000ULL;
47 SET_FLT128_MSW64(x,hx); 50 SET_FLT128_MSW64(x,hx);
48 return x; 51 return x;
49 } 52 }