projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 26dee9c4 | 1 | /* ix87 specific frexp implementation for float. |
| f7a9f785 | 2 | Copyright (C) 1997-2016 Free Software Foundation, Inc. |
| 26dee9c4 UD |
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 | |
| 41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 26dee9c4 UD |
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 | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| 26dee9c4 | 15 | |
| 41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| 26dee9c4 UD |
19 | |
| 20 | #include <machine/asm.h> | |
| 21 | ||
| 26dee9c4 | 22 | .section .rodata |
| 26dee9c4 UD |
23 | |
| 24 | .align ALIGNARG(4) | |
| b67e9372 | 25 | .type two25,@object |
| 26dee9c4 UD |
26 | two25: .byte 0, 0, 0, 0x4c |
| 27 | ASM_SIZE_DIRECTIVE(two25) | |
| 28 | ||
| 29 | #ifdef PIC | |
| 30 | #define MO(op) op##@GOTOFF(%edx) | |
| 31 | #else | |
| 32 | #define MO(op) op | |
| 33 | #endif | |
| 34 | ||
| 2366713d | 35 | #define PARMS 4 /* no space for saved regs */ |
| 9e25f6e2 GM |
36 | #define VAL PARMS |
| 37 | #define EXPP VAL+4 | |
| 38 | ||
| 26dee9c4 | 39 | .text |
| 2366713d | 40 | ENTRY (__frexpf) |
| 9e25f6e2 GM |
41 | |
| 42 | movl VAL(%esp), %eax | |
| 26dee9c4 UD |
43 | xorl %ecx, %ecx |
| 44 | movl %eax, %edx | |
| 45 | andl $0x7fffffff, %eax | |
| 46 | jz 1f | |
| 47 | cmpl $0x7f800000, %eax | |
| 48 | jae 1f | |
| 49 | ||
| 50 | cmpl $0x00800000, %eax | |
| 51 | jae 2f | |
| 52 | ||
| 9e25f6e2 | 53 | flds VAL(%esp) |
| 26dee9c4 | 54 | #ifdef PIC |
| fee732e5 | 55 | LOAD_PIC_REG (dx) |
| 26dee9c4 UD |
56 | #endif |
| 57 | fmuls MO(two25) | |
| 58 | movl $-25, %ecx | |
| 9e25f6e2 | 59 | fstps VAL(%esp) |
| 00f5fcbb | 60 | fwait |
| 9e25f6e2 | 61 | movl VAL(%esp), %eax |
| 26dee9c4 UD |
62 | movl %eax, %edx |
| 63 | andl $0x7fffffff, %eax | |
| 64 | ||
| 65 | 2: shrl $23, %eax | |
| 66 | andl $0x807fffff, %edx | |
| 67 | subl $126, %eax | |
| 68 | orl $0x3f000000, %edx | |
| 69 | addl %eax, %ecx | |
| 9e25f6e2 | 70 | movl %edx, VAL(%esp) |
| 26dee9c4 UD |
71 | |
| 72 | /* Store %ecx in the variable pointed to by the second argument, | |
| 73 | get the factor from the stack and return. */ | |
| 9e25f6e2 | 74 | 1: movl EXPP(%esp), %eax |
| 9e25f6e2 | 75 | flds VAL(%esp) |
| 26dee9c4 | 76 | movl %ecx, (%eax) |
| 9e25f6e2 | 77 | |
| 26dee9c4 | 78 | ret |
| 2366713d JM |
79 | END (__frexpf) |
| 80 | weak_alias (__frexpf, frexpf) |