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c9cf6dde | 1 | /* ix87 specific implementation of pow function. |
688903eb | 2 | Copyright (C) 1996-2018 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 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
c9cf6dde AJ |
19 | |
20 | #include <machine/asm.h> | |
6ace3938 | 21 | #include <x86_64-math-asm.h> |
c9cf6dde | 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) | |
c898991d JM |
29 | .type p2,@object |
30 | p2: .byte 0, 0, 0, 0, 0, 0, 0x10, 0x40 | |
31 | ASM_SIZE_DIRECTIVE(p2) | |
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 p64,@object |
2460d3aa JM |
36 | p64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43 |
37 | ASM_SIZE_DIRECTIVE(p64) | |
b67e9372 | 38 | .type p78,@object |
8f9a2fae JM |
39 | p78: .byte 0, 0, 0, 0, 0, 0, 0xd0, 0x44 |
40 | ASM_SIZE_DIRECTIVE(p78) | |
60e235ee JM |
41 | .type pm79,@object |
42 | pm79: .byte 0, 0, 0, 0, 0, 0, 0, 0x3b | |
43 | ASM_SIZE_DIRECTIVE(pm79) | |
c9cf6dde | 44 | |
0ac5ae23 | 45 | .section .rodata.cst16,"aM",@progbits,16 |
622c86f4 | 46 | |
0ac5ae23 | 47 | .p2align 3 |
b67e9372 | 48 | .type infinity,@object |
c9cf6dde AJ |
49 | inf_zero: |
50 | infinity: | |
51 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x7f | |
52 | ASM_SIZE_DIRECTIVE(infinity) | |
b67e9372 | 53 | .type zero,@object |
c9cf6dde AJ |
54 | zero: .double 0.0 |
55 | ASM_SIZE_DIRECTIVE(zero) | |
b67e9372 | 56 | .type minf_mzero,@object |
c9cf6dde AJ |
57 | minf_mzero: |
58 | minfinity: | |
59 | .byte 0, 0, 0, 0, 0, 0, 0xf0, 0xff | |
60 | mzero: | |
61 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80 | |
62 | ASM_SIZE_DIRECTIVE(minf_mzero) | |
6ace3938 | 63 | DEFINE_LDBL_MIN |
c9cf6dde AJ |
64 | |
65 | #ifdef PIC | |
0ac5ae23 | 66 | # define MO(op) op##(%rip) |
c9cf6dde | 67 | #else |
0ac5ae23 | 68 | # define MO(op) op |
c9cf6dde AJ |
69 | #endif |
70 | ||
71 | .text | |
72 | ENTRY(__ieee754_powl) | |
73 | fldt 24(%rsp) // y | |
74 | fxam | |
75 | ||
76 | ||
77 | fnstsw | |
78 | movb %ah, %dl | |
79 | andb $0x45, %ah | |
80 | cmpb $0x40, %ah // is y == 0 ? | |
81 | je 11f | |
82 | ||
83 |