projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 26dee9c4 | 1 | /* ix87 specific frexp implementation for long double. |
| 2b778ceb | 2 | Copyright (C) 1997-2021 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 | 17 | License along with the GNU C Library; if not, see |
| 5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
| 26dee9c4 | 19 | |
| 2ce30701 | 20 | #include <libm-alias-ldouble.h> |
| 26dee9c4 UD |
21 | #include <machine/asm.h> |
| 22 | ||
| 26dee9c4 | 23 | .section .rodata |
| 26dee9c4 UD |
24 | |
| 25 | .align ALIGNARG(4) | |
| b67e9372 | 26 | .type two64,@object |
| 26dee9c4 UD |
27 | two64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43 |
| 28 | ASM_SIZE_DIRECTIVE(two64) | |
| 29 | ||
| 30 | #ifdef PIC | |
| 31 | #define MO(op) op##@GOTOFF(%edx) | |
| 32 | #else | |
| 33 | #define MO(op) op | |
| 34 | #endif | |
| 35 | ||
| 2366713d | 36 | #define PARMS 4 /* no space for saved regs */ |
| 9e25f6e2 GM |
37 | #define VAL0 PARMS |
| 38 | #define VAL1 VAL0+4 | |
| 39 | #define VAL2 VAL1+4 | |
| 40 | #define EXPP VAL2+4 | |
| 41 | ||
| 26dee9c4 | 42 | .text |
| 2366713d | 43 | ENTRY (__frexpl) |
| 9e25f6e2 GM |
44 | |
| 45 | movl VAL0(%esp), %ecx | |
| 46 | movl VAL2(%esp), %eax | |
| 47 | orl VAL1(%esp), %ecx | |
| 26dee9c4 UD |
48 | movl %eax, %edx |
| 49 | andl $0x7fff, %eax | |
| 50 | orl %eax, %ecx | |
| 51 | jz 1f | |
| 52 | xorl %ecx, %ecx | |
| 53 | cmpl $0x7fff, %eax | |
| 88283451 | 54 | je 3f |
| 26dee9c4 UD |
55 | |
| 56 | cmpl $0, %eax | |
| 601d2942 | 57 | jne 2f |
| 79569444 | 58 | |
| 9e25f6e2 | 59 | fldt VAL0(%esp) |
| 26dee9c4 | 60 | #ifdef PIC |
| fee732e5 | 61 | LOAD_PIC_REG (dx) |
| 26dee9c4 | 62 | #endif |
| 79569444 | 63 | |
| 26dee9c4 UD |
64 | fmull MO(two64) /* It's not necessary to use a 80bit factor */ |
| 65 | movl $-64, %ecx | |
| 9e25f6e2 | 66 | fstpt VAL0(%esp) |
| 00f5fcbb | 67 | fwait |
| 9e25f6e2 | 68 | movl VAL2(%esp), %eax |
| 26dee9c4 UD |
69 | movl %eax, %edx |
| 70 | andl $0x7fff, %eax | |
| 71 | ||
| 72 | 2: andl $0x8000, %edx | |
| 73 | subl $16382, %eax | |
| 74 | orl $0x3ffe, %edx | |
| 75 | addl %eax, %ecx | |
| 9e25f6e2 | 76 | movl %edx, VAL2(%esp) |
| 26dee9c4 UD |
77 | |
| 78 | /* Store %ecx in the variable pointed to by the second argument, | |
| 79 | get the factor from the stack and return. */ | |
| 9e25f6e2 | 80 | 1: movl EXPP(%esp), %eax |
| 9e25f6e2 | 81 | fldt VAL0(%esp) |
| 26dee9c4 | 82 | movl %ecx, (%eax) |
| 9e25f6e2 | 83 | |
| 26dee9c4 | 84 | ret |
| 88283451 JM |
85 | |
| 86 | /* Infinity or NaN; ensure signaling NaNs are quieted. */ | |
| 87 | 3: movl EXPP(%esp), %eax | |
| 88 | fldt VAL0(%esp) | |
| 89 | fadd %st | |
| 90 | movl %ecx, (%eax) | |
| 91 | ret | |
| 2366713d | 92 | END (__frexpl) |
| 2ce30701 | 93 | libm_alias_ldouble (__frexp, frexp) |