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 | * | |
| 7 | * Changed to use fyl2xp1 for values near 1, <drepper@cygnus.com>. | |
| 8 | * Adapted for x86-64 by Andreas Jaeger <aj@suse.de>. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <machine/asm.h> | |
| 12 | ||
| 13 | RCSID("$NetBSD: $") | |
| 14 | ||
| 15 | #ifdef __ELF__ | |
| 16 | .section .rodata | |
| 17 | #else | |
| 18 | .text | |
| 19 | #endif | |
| 20 | .align ALIGNARG(4) | |
| 21 | ASM_TYPE_DIRECTIVE(one,@object) | |
| 22 | one: .double 1.0 | |
| 23 | ASM_SIZE_DIRECTIVE(one) | |
| 24 | /* It is not important that this constant is precise. It is only | |
| 25 | a value which is known to be on the safe side for using the | |
| 26 | fyl2xp1 instruction. */ | |
| 27 | ASM_TYPE_DIRECTIVE(limit,@object) | |
| 28 | limit: .double 0.29 | |
| 29 | ASM_SIZE_DIRECTIVE(limit) | |
| 30 | ||
| 31 | ||
| 32 | #ifdef PIC | |
| 33 | #define MO(op) op##(%rip) | |
| 34 | #else | |
| 35 | #define MO(op) op | |
| 36 | #endif | |
| 37 | ||
| 38 | .text | |
| 39 | ENTRY(__ieee754_log10l) | |
| 40 | fldlg2 // log10(2) | |
| 41 | fldt 8(%rsp) // x : log10(2) | |
| 42 | fxam | |
| 43 | fnstsw | |
| 44 | fld %st // x : x : log10(2) | |
| 11bf311e | 45 | andb $1,%ah |
| c9cf6dde AJ |
46 |