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0f507b6c | 1 | /* isnan(). PowerPC32/POWER7 version. |
d4697bc9 | 2 | Copyright (C) 2010-2014 Free Software Foundation, Inc. |
0f507b6c LM |
3 | Contributed by Luis Machado <luisgpm@br.ibm.com>. |
4 | This file is part of the GNU C Library. | |
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/>. */ | |
0f507b6c LM |
19 | |
20 | #include <sysdep.h> | |
21 | #include <math_ldbl_opt.h> | |
22 | ||
23 | /* int __isnan(x) */ | |
24 | .section .rodata.cst8,"aM",@progbits,8 | |
25 | .align 3 | |
26 | .LC0: /* 1.0 */ | |
27 | .quad 0x3ff0000000000000 | |
28 | ||
29 | .section ".text" | |
30 | .type __isnan, @function | |
31 | .machine power7 | |
32 | ENTRY (__isnan) | |
33 | #ifdef SHARED | |
34 | mflr r11 | |
35 | cfi_register(lr,r11) | |
36 | ||
91d2a845 WS |
37 | SETUP_GOT_ACCESS(r9,got_label) |
38 | addis r9,r9,.LC0-got_label@ha | |
39 | lfd fp0,.LC0-got_label@l(r9) | |
0f507b6c LM |
40 | |
41 | mtlr r11 | |
42 | cfi_same_value (lr) | |
43 | #else | |
44 | lis r9,.LC0@ha | |
45 | lfd fp0,.LC0@l(r9) | |
46 | #endif | |
47 | ftdiv cr7,fp1,fp0 | |
48 | li r3,0 | |
49 | bflr 30 /* If not NaN or Inf, finish. */ | |
50 | ||
51 | /* We have -INF/+INF/NaN or a denormal. */ | |
52 | ||
53 | stwu r1,-16(r1) /* Allocate stack space. */ | |
54 | stfd fp1,8(r1) /* Transfer FP to GPR's. */ | |
55 | ori 2,2,0 /* Force a new dispatch group. */ | |
7b88401f AM |
56 | lwz r4,8+HIWORD(r1) /* Load the upper half of the FP value. */ |
57 | lwz r5,8+LOWORD(r1) /* Load the lower half of the FP value. */ | |
0f507b6c LM |
58 | addi r1,r1,16 /* Reset the stack pointer. */ |
59 | lis r0,0x7ff0 /* Load the upper portion for an INF/NaN. */ | |
60 | clrlwi r4,r4,1 /* r4 = abs(r4). */ | |
61 | cmpw cr7,r4,r0 /* if (abs(r4) <= inf). */ | |
62 | cmpwi cr6,r5,0 /* r5 == 0x00000000? */ | |
63 | bltlr cr7 /* LT means we have a denormal. */ | |
64 | bgt cr7,L(NaN) /* GT means we have a NaN. */ | |
65 | beqlr cr6 /* EQ means we have +/-INF. */ | |
66 | L(NaN): | |
67 | li r3,1 /* x == NaN? */ | |
68 | blr | |
69 | END (__isnan) | |
70 | ||
71 | hidden_def (__isnan) | |
72 | weak_alias (__isnan, isnan) | |
73 | ||
74 | /* It turns out that the 'double' version will also always work for | |
75 | single-precision. */ | |
76 | strong_alias (__isnan, __isnanf) | |
77 | hidden_def (__isnanf) | |
78 | weak_alias (__isnanf, isnanf) | |
79 | ||
80 | #ifdef NO_LONG_DOUBLE | |
81 | strong_alias (__isnan, __isnanl) | |
82 | weak_alias (__isnan, isnanl) | |
83 | #endif | |
84 | ||
a109996e | 85 | #if !IS_IN (libm) |
0f507b6c LM |
86 | # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0) |
87 | compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0); | |
88 | compat_symbol (libc, isnan, isnanl, GLIBC_2_0); | |
89 | # endif | |
90 | #endif |