git://sourceware.org / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 6bc31da0 | 1 | /* ix87 specific implementation of pow function. |
| aff6dc6c | 2 | Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. |
| 6bc31da0 UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Library General Public License as | |
| 8 | published by the Free Software Foundation; either version 2 of the | |
| 9 | License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Library General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Library General Public | |
| 17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 19 | Boston, MA 02111-1307, USA. */ | |
| 20 | ||
| 21 | #include <machine/asm.h> | |
| 22 | ||
| 23 | #ifdef __ELF__ | |
| 24 | .section .rodata | |
| 25 | #else | |
| 26 | .text | |
| 27 | #endif | |
| 28 | ||
| 29 | .align ALIGNARG(4) | |
| 0d8733c4 UD |
30 | ASM_TYPE_DIRECTIVE(infinity,@object) |
| 31 | inf_zero: | |
| 32 | infinity: | |
| 33 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x7f | |
| 34 | ASM_SIZE_DIRECTIVE(infinity) | |
| 35 | ASM_TYPE_DIRECTIVE(zero,@object) | |
| 36 | zero: .double 0.0 | |
| 37 | ASM_SIZE_DIRECTIVE(zero) | |
| 38 | ASM_TYPE_DIRECTIVE(minf_mzero,@object) | |
| 39 | minf_mzero: | |
| 40 | minfinity: | |
| 41 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0xff | |
| 42 | mzero: | |
| 43 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80 | |
| 44 | ASM_SIZE_DIRECTIVE(minf_mzero) | |
| 6bc31da0 UD |
45 | ASM_TYPE_DIRECTIVE(one,@object) |
| 46 | one: .double 1.0 | |
| 47 | ASM_SIZE_DIRECTIVE(one) | |
| 48 | ASM_TYPE_DIRECTIVE(limit,@object) | |
| 49 | limit: .double 0.29 | |
| 50 | ASM_SIZE_DIRECTIVE(limit) | |
| 51 | ||
| 52 | #ifdef PIC | |
| 53 | #define MO(op) op##@GOTOFF(%ecx) | |
| 0d8733c4 | 54 | #define MOX(op,x,f) op##@GOTOFF(%ecx,x,f) |
| 6bc31da0 UD |
55 | #else |
| 56 | #define MO(op) op | |
| 0d8733c4 | 57 | #define MOX(op,x,f) op(,x,f) |
| 6bc31da0 UD |
58 | #endif |
| 59 | ||
| 60 | .text | |
| 61 | ENTRY(__ieee754_pow) | |
| 0d8733c4 UD |
62 | fldl 12(%esp) // y |
| 63 | fxam | |
| e61abf83 UD |
64 | |
| 65 | #ifdef PIC | |
| 66 | call 1f | |
| 67 | 1: popl %ecx | |
| 68 | addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx | |
| 69 | #endif | |
| 70 | ||
| 0d8733c4 UD |
71 | fnstsw |
| 72 | movb %ah, %dl | |
| 73 | andb $0x45, %ah | |
| 74 | cmpb $0x40, %ah // is y == 0 ? | |
| 75 | je 11f | |
| 76 | ||
| 77 |