diff options
Diffstat (limited to 'src/regress/lib/libc/cephes/etanh.c')
| -rw-r--r-- | src/regress/lib/libc/cephes/etanh.c | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/src/regress/lib/libc/cephes/etanh.c b/src/regress/lib/libc/cephes/etanh.c deleted file mode 100644 index 4ac5ff1c21..0000000000 --- a/src/regress/lib/libc/cephes/etanh.c +++ /dev/null | |||
| @@ -1,70 +0,0 @@ | |||
| 1 | /* $OpenBSD: etanh.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 | /* xtanh.c */ | ||
| 20 | /* hyperbolic tangent check routine */ | ||
| 21 | /* this subroutine is used by the exponential function routine */ | ||
| 22 | /* by Stephen L. Moshier. */ | ||
| 23 | |||
| 24 | |||
| 25 | |||
| 26 | #include "ehead.h" | ||
| 27 | |||
| 28 | |||
| 29 | void etanh( x, y ) | ||
| 30 | unsigned short *x, *y; | ||
| 31 | { | ||
| 32 | unsigned short e[NE], r[NE], j[NE], xx[NE], m2[NE]; | ||
| 33 | short i, n; | ||
| 34 | long lj; | ||
| 35 | |||
| 36 | emov( x, r ); | ||
| 37 | r[NE-1] &= (unsigned short )0x7fff; | ||
| 38 | if( ecmp(r, eone) >= 0 ) | ||
| 39 | { | ||
| 40 | /* tanh(x) = (exp(x) - exp(-x)) / (exp(x) + exp(-x)) | ||
| 41 | * Note eexp() calls xtanh, but with an argument less than (1 + log 2)/2. | ||
| 42 | */ | ||
| 43 | eexp( r, e ); | ||
| 44 | ediv( e, eone, r ); | ||
| 45 | esub( r, e, xx ); | ||
| 46 | eadd( r, e, j ); | ||
| 47 | ediv( j, xx, y ); | ||
| 48 | return; | ||
| 49 | } | ||
| 50 | |||
| 51 | emov( etwo, m2 ); | ||
| 52 | eneg( m2 ); | ||
| 53 | |||
| 54 | n = NBITS/8; /* Number of terms to do in the continued fraction */ | ||
| 55 | lj = 2 * n + 1; | ||
| 56 | ltoe( &lj, j ); | ||
| 57 | |||
| 58 | emov( j, e ); | ||
| 59 | emul( x, x, xx ); | ||
| 60 | |||
| 61 | /* continued fraction */ | ||
| 62 | for( i=0; i<n; i++) | ||
| 63 | { | ||
| 64 | ediv( e, xx, r ); | ||
| 65 | eadd( m2, j, j ); | ||
| 66 | eadd( r, j, e ); | ||
| 67 | } | ||
| 68 | |||
| 69 | ediv( e, x, y ); | ||
| 70 | } | ||
