projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 26dee9c4 | 1 | /* ix87 specific frexp implementation for long double. |
| dff8da6b | 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
| 26dee9c4 | 3 | This file is part of the GNU C Library. |
| 26dee9c4 UD |
4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 26dee9c4 UD |
9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 13 | Lesser General Public License for more details. |
| 26dee9c4 | 14 | |
| 41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| 26dee9c4 | 18 | |
| 2ce30701 | 19 | #include <libm-alias-ldouble.h> |
| 26dee9c4 UD |
20 | #include <machine/asm.h> |
| 21 | ||
| 26dee9c4 | 22 | .section .rodata |
| 26dee9c4 UD |
23 | |
| 24 | .align ALIGNARG(4) | |
| b67e9372 | 25 | .type two64,@object |
| 26dee9c4 UD |
26 | two64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43 |
| 27 | ASM_SIZE_DIRECTIVE(two64) | |
| 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 VAL0 PARMS |
| 37 | #define VAL1 VAL0+4 | |
| 38 | #define VAL2 VAL1+4 | |
| 39 | #define EXPP VAL2+4 | |
| 40 | ||
| 26dee9c4 | 41 | .text |
| 2366713d | 42 | ENTRY (__frexpl) |
| 9e25f6e2 GM |
43 | |
| 44 | movl VAL0(%esp), %ecx | |
| 45 | movl VAL2(%esp), %eax | |
| 46 | orl VAL1(%esp), %ecx | |
| 26dee9c4 UD |
47 | movl %eax, %edx |
| 48 | andl $0x7fff, %eax | |
| 49 | orl %eax, %ecx | |
| 50 | jz 1f | |
| 51 | xorl %ecx, %ecx | |
| 52 | cmpl $0x7fff, %eax | |
| 88283451 | 53 | je 3f |
| 26dee9c4 UD |
54 | |
| 55 | cmpl $0, %eax | |
| 601d2942 | 56 | jne 2f |
| 79569444 | 57 | |
| 9e25f6e2 | 58 | fldt VAL0(%esp) |
| 26dee9c4 | 59 | #ifdef PIC |
| fee732e5 | 60 | LOAD_PIC_REG (dx) |
| 26dee9c4 | 61 | #endif |
| 79569444 | 62 | |
| 26dee9c4 UD |
63 | fmull MO(two64) /* It's not necessary to use a 80bit factor */ |
| 64 | movl $-64, %ecx | |
| 9e25f6e2 | 65 | fstpt VAL0(%esp) |
| 00f5fcbb | 66 | fwait |
| 9e25f6e2 | 67 | movl VAL2(%esp), %eax |
| 26dee9c4 UD |
68 | movl %eax, %edx |
| 69 | andl $0x7fff, %eax | |
| 70 | ||
| 71 | 2: andl $0x8000, %edx | |
| 72 | subl $16382, %eax | |
| 73 | orl $0x3ffe, %edx | |
| 74 | addl %eax, %ecx | |
| 9e25f6e2 | 75 | movl %edx, VAL2(%esp) |
| 26dee9c4 UD |
76 | |
| 77 | /* Store %ecx in the variable pointed to by the second argument, | |
| 78 | get the factor from the stack and return. */ | |
| 9e25f6e2 | 79 | 1: movl EXPP(%esp), %eax |
| 9e25f6e2 | 80 | fldt VAL0(%esp) |
| 26dee9c4 | 81 | movl %ecx, (%eax) |
| 9e25f6e2 | 82 | |
| 26dee9c4 | 83 | ret |
| 88283451 JM |
84 | |
| 85 | /* Infinity or NaN; ensure signaling NaNs are quieted. */ | |
| 86 | 3: movl EXPP(%esp), %eax | |
| 87 | fldt VAL0(%esp) | |
| 88 | fadd %st | |
| 89 | movl %ecx, (%eax) | |
| 90 | ret | |
| 2366713d | 91 | END (__frexpl) |
| 2ce30701 | 92 | libm_alias_ldouble (__frexp, frexp) |