projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 26dee9c4 UD |
1 | /* ix87 specific frexp implementation for long double. |
| 2 | Copyright (C) 1997 Free Software Foundation, Inc. | |
| 3 | This file is part of the GNU C Library. | |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
| 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) | |
| 30 | ASM_TYPE_DIRECTIVE(two64,@object) | |
| 31 | two64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43 | |
| 32 | ASM_SIZE_DIRECTIVE(two64) | |
| 33 | ||
| 34 | #ifdef PIC | |
| 35 | #define MO(op) op##@GOTOFF(%edx) | |
| 36 | #else | |
| 37 | #define MO(op) op | |
| 38 | #endif | |
| 39 | ||
| 40 | .text | |
| 41 | ENTRY(__frexpl) | |
| 42 | movl 4(%esp), %ecx | |
| 43 | movl 12(%esp), %eax | |
| 44 | orl 8(%esp), %ecx | |
| 45 | movl %eax, %edx | |
| 46 | andl $0x7fff, %eax | |
| 47 | orl %eax, %ecx | |
| 48 | jz 1f | |
| 49 | xorl %ecx, %ecx | |
| 50 | cmpl $0x7fff, %eax | |
| 51 | je 1f | |
| 52 | ||
| 53 | cmpl $0, %eax | |
| 54 | je 2f | |
| 55 | ||
| 56 | fldt 4(%esp) | |
| 57 | #ifdef PIC | |
| 58 | call 3f | |
| 59 | 3: popl %edx | |
| 60 | addl $_GLOBAL_OFFSET_TABLE_+[.-3b], %edx | |
| 61 | #endif | |
| 62 | fmull MO(two64) /* It's not necessary to use a 80bit factor */ | |
| 63 | movl $-64, %ecx | |
| 64 | fstpt 4(%esp) | |
| 65 | movl 12(%esp), %eax | |
| 66 | movl %eax, %edx | |
| 67 | andl $0x7fff, %eax | |
| 68 | ||
| 69 | 2: andl $0x8000, %edx | |
| 70 | subl $16382, %eax | |
| 71 | orl $0x3ffe, %edx | |
| 72 | addl %eax, %ecx | |
| 73 | movl %edx, 12(%esp) | |
| 74 | ||
| 75 | /* Store %ecx in the variable pointed to by the second argument, | |
| 76 | get the factor from the stack and return. */ | |
| 77 | 1: movl 16(%esp), %eax | |
| 78 | fldt 4(%esp) | |
| 79 | movl %ecx, (%eax) | |
| 80 | ret | |
| 81 | END(__frexpl) | |
| 82 | weak_alias (__frexpl, frexpl) |