projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 0f507b6c | 1 | /* isnan(). PowerPC32/POWER7 version. |
| bfff8b1b | 2 | Copyright (C) 2010-2017 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 |