projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c9cf6dde | 1 | /* ix87 specific implementation of pow function. |
| 2b778ceb | 2 | Copyright (C) 1996-2021 Free Software Foundation, Inc. |
| c9cf6dde AJ |
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 | |
| 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. | |
| 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 | Lesser General Public License for more details. | |
| 15 | ||
| 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/>. */ |
| c9cf6dde AJ |
19 | |
| 20 | #include <machine/asm.h> | |
| 6ace3938 | 21 | #include <x86_64-math-asm.h> |
| 220622dd | 22 | #include <libm-alias-finite.h> |
| c9cf6dde | 23 | |
| 0ac5ae23 | 24 | .section .rodata.cst8,"aM",@progbits,8 |
| 622c86f4 | 25 | |
| 0ac5ae23 | 26 | .p2align 3 |
| b67e9372 | 27 | .type one,@object |
| 0ac5ae23 UD |
28 | one: .double 1.0 |
| 29 | ASM_SIZE_DIRECTIVE(one) | |
| c898991d JM |
30 | .type p2,@object |
| 31 | p2: .byte 0, 0, 0, 0, 0, 0, 0x10, 0x40 | |
| 32 | ASM_SIZE_DIRECTIVE(p2) | |
| b67e9372 | 33 | .type p63,@object |
| 0ac5ae23 UD |
34 | p63: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x43 |
| 35 | ASM_SIZE_DIRECTIVE(p63) | |
| b67e9372 | 36 | .type p64,@object |
| 2460d3aa JM |
37 | p64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43 |
| 38 | ASM_SIZE_DIRECTIVE(p64) | |
| b67e9372 | 39 | .type p78,@object |
| 8f9a2fae JM |
40 | p78: .byte 0, 0, 0, 0, 0, 0, 0xd0, 0x44 |
| 41 | ASM_SIZE_DIRECTIVE(p78) | |
| 60e235ee JM |
42 | .type pm79,@object |
| 43 | pm79: .byte 0, 0, 0, 0, 0, 0, 0, 0x3b | |
| 44 | ASM_SIZE_DIRECTIVE(pm79) | |
| c9cf6dde | 45 | |
| 0ac5ae23 | 46 | .section .rodata.cst16,"aM",@progbits,16 |
| 622c86f4 | 47 | |
| 0ac5ae23 | 48 | .p2align 3 |
| b67e9372 | 49 | .type infinity,@object |
| c9cf6dde AJ |
50 | inf_zero: |
| 51 | infinity: | |
| 52 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x7f | |
| 53 | ASM_SIZE_DIRECTIVE(infinity) | |
| b67e9372 | 54 | .type zero,@object |
| c9cf6dde AJ |
55 | zero: .double 0.0 |
| 56 | ASM_SIZE_DIRECTIVE(zero) | |
| b67e9372 | 57 | .type minf_mzero,@object |
| c9cf6dde AJ |
58 | minf_mzero: |
| 59 | minfinity: | |
| 60 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0xff | |
| 61 | mzero: | |
| 62 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80 | |
| 63 | ASM_SIZE_DIRECTIVE(minf_mzero) | |
| 6ace3938 | 64 | DEFINE_LDBL_MIN |
| c9cf6dde AJ |
65 | |
| 66 | #ifdef PIC | |
| 0ac5ae23 | 67 | # define MO(op) op##(%rip) |
| c9cf6dde | 68 | #else |
| 0ac5ae23 | 69 | # define MO(op) op |
| c9cf6dde AJ |
70 | #endif |
| 71 | ||
| 72 | .text | |
| 73 | ENTRY(__ieee754_powl) | |
| 74 | fldt 24(%rsp) // y | |
| 75 | fxam | |
| 76 | ||
| 77 | ||
| 78 | fnstsw | |
| 79 | movb %ah, %dl | |
| 80 | andb $0x45, %ah | |
| 81 | cmpb $0x40, %ah // is y == 0 ? | |
| 82 | je 11f | |
| 83 | ||
| 84 |