Last change
on this file since 352 was 352, checked in by coas-nagasima, 6 years ago |
arm向けASP3版ECNLを追加
|
-
Property svn:eol-style
set to
native
-
Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
|
File size:
1004 bytes
|
Rev | Line | |
---|
[352] | 1 | #include <limits.h>
|
---|
| 2 | #include "libm.h"
|
---|
| 3 |
|
---|
| 4 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
|
---|
| 5 | int ilogbl(long double x)
|
---|
| 6 | {
|
---|
| 7 | return ilogb(x);
|
---|
| 8 | }
|
---|
| 9 | #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
|
---|
| 10 | int ilogbl(long double x)
|
---|
| 11 | {
|
---|
| 12 | #pragma STDC FENV_ACCESS ON
|
---|
| 13 | union ldshape u = {x};
|
---|
| 14 | uint64_t m = u.i.m;
|
---|
| 15 | int e = u.i.se & 0x7fff;
|
---|
| 16 |
|
---|
| 17 | if (!e) {
|
---|
| 18 | if (m == 0) {
|
---|
| 19 | FORCE_EVAL(0/0.0f);
|
---|
| 20 | return FP_ILOGB0;
|
---|
| 21 | }
|
---|
| 22 | /* subnormal x */
|
---|
| 23 | for (e = -0x3fff+1; m>>63 == 0; e--, m<<=1);
|
---|
| 24 | return e;
|
---|
| 25 | }
|
---|
| 26 | if (e == 0x7fff) {
|
---|
| 27 | FORCE_EVAL(0/0.0f);
|
---|
| 28 | return m<<1 ? FP_ILOGBNAN : INT_MAX;
|
---|
| 29 | }
|
---|
| 30 | return e - 0x3fff;
|
---|
| 31 | }
|
---|
| 32 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
|
---|
| 33 | int ilogbl(long double x)
|
---|
| 34 | {
|
---|
| 35 | #pragma STDC FENV_ACCESS ON
|
---|
| 36 | union ldshape u = {x};
|
---|
| 37 | int e = u.i.se & 0x7fff;
|
---|
| 38 |
|
---|
| 39 | if (!e) {
|
---|
| 40 | if (x == 0) {
|
---|
| 41 | FORCE_EVAL(0/0.0f);
|
---|
| 42 | return FP_ILOGB0;
|
---|
| 43 | }
|
---|
| 44 | /* subnormal x */
|
---|
| 45 | x *= 0x1p120;
|
---|
| 46 | return ilogbl(x) - 120;
|
---|
| 47 | }
|
---|
| 48 | if (e == 0x7fff) {
|
---|
| 49 | FORCE_EVAL(0/0.0f);
|
---|
| 50 | u.i.se = 0;
|
---|
| 51 | return u.f ? FP_ILOGBNAN : INT_MAX;
|
---|
| 52 | }
|
---|
| 53 | return e - 0x3fff;
|
---|
| 54 | }
|
---|
| 55 | #endif
|
---|
Note:
See
TracBrowser
for help on using the repository browser.