diff options
Diffstat (limited to 'src/regress/lib/libc/cephes/eexp.c')
| -rw-r--r-- | src/regress/lib/libc/cephes/eexp.c | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/src/regress/lib/libc/cephes/eexp.c b/src/regress/lib/libc/cephes/eexp.c deleted file mode 100644 index 74f0d6adb3..0000000000 --- a/src/regress/lib/libc/cephes/eexp.c +++ /dev/null | |||
| @@ -1,86 +0,0 @@ | |||
| 1 | /* $OpenBSD: eexp.c,v 1.1 2011/07/02 18:11:01 martynas Exp $ */ | ||
| 2 | |||
| 3 | /* | ||
| 4 | * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net> | ||
| 5 | * | ||
| 6 | * Permission to use, copy, modify, and distribute this software for any | ||
| 7 | * purpose with or without fee is hereby granted, provided that the above | ||
| 8 | * copyright notice and this permission notice appear in all copies. | ||
| 9 | * | ||
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
| 14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
| 17 | */ | ||
| 18 | |||
| 19 | /* xexp.c */ | ||
| 20 | /* exponential function check routine */ | ||
| 21 | /* by Stephen L. Moshier. */ | ||
| 22 | |||
| 23 | |||
| 24 | #include "ehead.h" | ||
| 25 | |||
| 26 | void eexp( x, y ) | ||
| 27 | unsigned short *x, *y; | ||
| 28 | { | ||
| 29 | unsigned short num[NE], den[NE], x2[NE]; | ||
| 30 | long i; | ||
| 31 | unsigned short sign, expchk; | ||
| 32 | |||
| 33 | /* range reduction theory: x = i + f, 0<=f<1; | ||
| 34 | * e**x = e**i * e**f | ||
| 35 | * e**i = 2**(i/log 2). | ||
| 36 | * Let i/log2 = i1 + f1, 0<=f1<1. | ||
| 37 | * Then e**i = 2**i1 * 2**f1, so | ||
| 38 | * e**x = 2**i1 * e**(log 2 * f1) * e**f. | ||
| 39 | */ | ||
| 40 | if( ecmp(x, ezero) == 0 ) | ||
| 41 | { | ||
| 42 | emov( eone, y ); | ||
| 43 | return; | ||
| 44 | } | ||
| 45 | emov(x, x2); | ||
| 46 | expchk = x2[NE-1]; | ||
| 47 | sign = expchk & 0x8000; | ||
| 48 | x2[NE-1] &= 0x7fff; | ||
| 49 | |||
| 50 | /* Test for excessively large argument */ | ||
| 51 | expchk &= 0x7fff; | ||
| 52 | if( expchk > (EXONE + 15) ) | ||
| 53 | { | ||
| 54 | eclear( y ); | ||
| 55 | if( sign == 0 ) | ||
| 56 | einfin( y ); | ||
| 57 | return; | ||
| 58 | } | ||
| 59 | |||
| 60 | eifrac( x2, &i, num ); /* x = i + f */ | ||
| 61 | |||
| 62 | if( i != 0 ) | ||
| 63 | { | ||
| 64 | ltoe( &i, den ); /* floating point i */ | ||
| 65 | ediv( elog2, den, den ); /* i/log 2 */ | ||
| 66 | eifrac( den, &i, den ); /* i/log 2 = i1 + f1 */ | ||
| 67 | emul( elog2, den, den ); /* log 2 * f1 */ | ||
| 68 | eadd( den, num, x2 ); /* log 2 * f1 + f */ | ||
| 69 | } | ||
| 70 | |||
| 71 | /*x2[NE-1] -= 1;*/ | ||
| 72 | eldexp( x2, -1L, x2 ); /* divide by 2 */ | ||
| 73 | etanh( x2, x2 ); /* tanh( x/2 ) */ | ||
| 74 | eadd( x2, eone, num ); /* 1 + tanh */ | ||
| 75 | eneg( x2 ); | ||
| 76 | eadd( x2, eone, den ); /* 1 - tanh */ | ||
| 77 | ediv( den, num, y ); /* (1 + tanh)/(1 - tanh) */ | ||
| 78 | |||
| 79 | /*y[NE-1] += i;*/ | ||
| 80 | if( sign ) | ||
| 81 | { | ||
| 82 | ediv( y, eone, y ); | ||
| 83 | i = -i; | ||
| 84 | } | ||
| 85 | eldexp( y, i, y ); /* multiply by 2**i */ | ||
| 86 | } | ||
