projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 6bc31da0 | 1 | /* ix87 specific implementation of pow function. |
| 11bf311e | 2 | Copyright (C) 1996, 1997, 1999, 2001, 2004, 2005 |
| fee732e5 | 3 | Free Software Foundation, Inc. |
| 6bc31da0 UD |
4 | This file is part of the GNU C Library. |
| 5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
8 | modify it under the terms of the GNU Lesser General Public |
| 9 | License as published by the Free Software Foundation; either | |
| 10 | version 2.1 of the License, or (at your option) any later version. | |
| 6bc31da0 UD |
11 | |
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 15 | Lesser General Public License for more details. |
| 6bc31da0 | 16 | |
| 41bdb6e2 AJ |
17 | You should have received a copy of the GNU Lesser General Public |
| 18 | License along with the GNU C Library; if not, write to the Free | |
| 19 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 20 | 02111-1307 USA. */ | |
| 6bc31da0 UD |
21 | |
| 22 | #include <machine/asm.h> | |
| 23 | ||
| 24 | #ifdef __ELF__ | |
| 25 | .section .rodata | |
| 26 | #else | |
| 27 | .text | |
| 28 | #endif | |
| 29 | ||
| 30 | .align ALIGNARG(4) | |
| 0d8733c4 UD |
31 | ASM_TYPE_DIRECTIVE(infinity,@object) |
| 32 | inf_zero: | |
| 33 | infinity: | |
| 34 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x7f | |
| 35 | ASM_SIZE_DIRECTIVE(infinity) | |
| 36 | ASM_TYPE_DIRECTIVE(zero,@object) | |
| 37 | zero: .double 0.0 | |
| 38 | ASM_SIZE_DIRECTIVE(zero) | |
| 39 | ASM_TYPE_DIRECTIVE(minf_mzero,@object) | |
| 40 | minf_mzero: | |
| 41 | minfinity: | |
| 42 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0xff | |
| 43 | mzero: | |
| 44 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80 | |
| 45 | ASM_SIZE_DIRECTIVE(minf_mzero) | |
| 6bc31da0 UD |
46 | ASM_TYPE_DIRECTIVE(one,@object) |
| 47 | one: .double 1.0 | |
| 48 | ASM_SIZE_DIRECTIVE(one) | |
| 49 | ASM_TYPE_DIRECTIVE(limit,@object) | |
| 50 | limit: .double 0.29 | |
| 51 | ASM_SIZE_DIRECTIVE(limit) | |
| c747e725 UD |
52 | ASM_TYPE_DIRECTIVE(p31,@object) |
| 53 | p31: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x41 | |
| 54 | ASM_SIZE_DIRECTIVE(p31) | |
| 6bc31da0 UD |
55 | |
| 56 | #ifdef PIC | |
| 57 | #define MO(op) op##@GOTOFF(%ecx) | |
| 0d8733c4 | 58 | #define MOX(op,x,f) op##@GOTOFF(%ecx,x,f) |
| 6bc31da0 UD |
59 | #else |
| 60 | #define MO(op) op | |
| 0d8733c4 | 61 | #define MOX(op,x,f) op(,x,f) |
| 6bc31da0 UD |
62 | #endif |
| 63 | ||
| 64 | .text | |
| 65 | ENTRY(__ieee754_powf) | |
| 0d8733c4 UD |
66 | flds 8(%esp) // y |
| 67 | fxam | |
| e61abf83 UD |
68 | |
| 69 | #ifdef PIC | |
| fee732e5 | 70 | LOAD_PIC_REG (cx) |
| e61abf83 UD |
71 | #endif |
| 72 | ||
| 0d8733c4 UD |
73 | fnstsw |
| 74 | movb %ah, %dl | |
| 75 | andb $0x45, %ah | |
| 76 | cmpb $0x40, %ah // is y == 0 ? | |
| 77 | je 11f | |
| 78 | ||
| 79 |