projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c9cf6dde AJ |
1 | /* |
| 2 | * Written by J.T. Conklin <jtc@netbsd.org>. | |
| 3 | * Public domain. | |
| 4 | * | |
| 5 | * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>. | |
| 6 | * Adapted for x86-64 by Andreas Jaeger <aj@suse.de>. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <machine/asm.h> | |
| 10 | ||
| 11 | RCSID("$NetBSD: s_log1p.S,v 1.7 1995/05/09 00:10:58 jtc Exp $") | |
| 12 | ||
| 13 | #ifdef __ELF__ | |
| 14 | .section .rodata | |
| 15 | #else | |
| 16 | .text | |
| 17 | #endif | |
| 18 | .align ALIGNARG(4) | |
| 19 | /* The fyl2xp1 can only be used for values in | |
| 20 | -1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2 | |
| 21 | 0.29 is a safe value. | |
| 22 | */ | |
| 23 | limit: .tfloat 0.29 | |
| 24 | /* Please note: we use a double value here. Since 1.0 has | |
| 25 | an exact representation this does not effect the accuracy | |
| 26 | but it helps to optimize the code. */ | |
| 27 | one: .double 1.0 | |
| 28 | ||
| 29 | /* | |
| 30 | * Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29, | |
| 31 | * otherwise fyl2x with the needed extra computation. | |
| 32 | */ | |
| 33 | #ifdef PIC | |
| 34 | #define MO(op) op##(%rip) | |
| 35 | #else | |
| 36 | #define MO(op) op | |
| 37 | #endif | |
| 38 | ||
| 39 | .text | |
| 40 | ENTRY(__log1pl) | |
| 41 | fldln2 | |
| 42 | ||
| 43 | fldt 8(%rsp) | |
| 44 | ||
| 45 | fxam | |
| 46 | fnstsw | |
| 47 | fld %st | |
| 0ecb606c | 48 | testb $1, %ah |
| c9cf6dde AJ |
49 |