projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 6bc31da0 | 1 | /* ix87 specific implementation of pow function. |
| 04277e02 | 2 | Copyright (C) 1996-2019 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 | |
| 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. | |
| 6bc31da0 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. |
| 6bc31da0 | 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/>. */ | |
| 6bc31da0 UD |
19 | |
| 20 | #include <machine/asm.h> | |
| 6f0f237b | 21 | #include <i386-math-asm.h> |
| 6bc31da0 | 22 | |
| 0ac5ae23 | 23 | .section .rodata.cst8,"aM",@progbits,8 |
| 622c86f4 | 24 | |
| 0ac5ae23 | 25 | .p2align 3 |
| b67e9372 | 26 | .type one,@object |
| 0ac5ae23 UD |
27 | one: .double 1.0 |
| 28 | ASM_SIZE_DIRECTIVE(one) | |
| b67e9372 | 29 | .type limit,@object |
| 0ac5ae23 UD |
30 | limit: .double 0.29 |
| 31 | ASM_SIZE_DIRECTIVE(limit) | |
| b67e9372 | 32 | .type p63,@object |
| 0ac5ae23 UD |
33 | p63: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x43 |
| 34 | ASM_SIZE_DIRECTIVE(p63) | |
| b67e9372 | 35 | .type p10,@object |
| c483f6b4 JM |
36 | p10: .byte 0, 0, 0, 0, 0, 0, 0x90, 0x40 |
| 37 | ASM_SIZE_DIRECTIVE(p10) | |
| 6bc31da0 | 38 | |
| 0ac5ae23 | 39 | .section .rodata.cst16,"aM",@progbits,16 |
| 622c86f4 | 40 | |
| 0ac5ae23 | 41 | .p2align 3 |
| b67e9372 | 42 | .type infinity,@object |
| 0d8733c4 UD |
43 | inf_zero: |
| 44 | infinity: | |
| 45 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x7f | |
| 46 | ASM_SIZE_DIRECTIVE(infinity) | |
| b67e9372 | 47 | .type zero,@object |
| 0d8733c4 UD |
48 | zero: .double 0.0 |
| 49 | ASM_SIZE_DIRECTIVE(zero) | |
| b67e9372 | 50 | .type minf_mzero,@object |
| 0d8733c4 UD |
51 | minf_mzero: |
| 52 | minfinity: | |
| 53 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0xff | |
| 54 | mzero: | |
| 55 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80 | |
| 56 | ASM_SIZE_DIRECTIVE(minf_mzero) | |
| 6ace3938 | 57 | DEFINE_DBL_MIN |
| 6bc31da0 UD |
58 | |
| 59 | #ifdef PIC | |
| 0ac5ae23 UD |
60 | # define MO(op) op##@GOTOFF(%ecx) |
| 61 | # define MOX(op,x,f) op##@GOTOFF(%ecx,x,f) | |
| 6bc31da0 | 62 | #else |
| 0ac5ae23 UD |
63 | # define MO(op) op |
| 64 | # define MOX(op,x,f) op(,x,f) | |
| 6bc31da0 UD |
65 | #endif |
| 66 | ||
| 67 | .text | |
| 68 | ENTRY(__ieee754_pow) | |
| 0d8733c4 UD |
69 | fldl 12(%esp) // y |
| 70 | fxam | |
| e61abf83 UD |
71 | |
| 72 | #ifdef PIC | |
| fee732e5 | 73 | LOAD_PIC_REG (cx) |
| e61abf83 UD |
74 | #endif |
| 75 | ||
| 0d8733c4 UD |
76 | fnstsw |
| 77 | movb %ah, %dl | |
| 78 | andb $0x45, %ah | |
| 79 | cmpb $0x40, %ah // is y == 0 ? | |
| 80 | je 11f | |
| 81 | ||
| 82 |