projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| a1267ba1 | 1 | /* Round to int floating-point values. PowerPC32 version. |
| 688903eb | 2 | Copyright (C) 2011-2018 Free Software Foundation, Inc. |
| a1267ba1 AZ |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 | |
| 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/>. */ | |
| a1267ba1 AZ |
19 | |
| 20 | /* This has been coded in assembler because GCC makes such a mess of it | |
| 21 | when it's coded in C. */ | |
| 22 | ||
| 23 | #include <sysdep.h> | |
| 24 | #include <math_ldbl_opt.h> | |
| 51ea3b20 | 25 | #include <libm-alias-double.h> |
| a1267ba1 AZ |
26 | |
| 27 | ||
| 28 | /* double [fp1] nearbyint(double [fp1] x) */ | |
| 29 | ||
| 30 | .section .rodata.cst4,"aM",@progbits,4 | |
| 31 | .align 2 | |
| 32 | .LC0: /* 2**52 */ | |
| 33 | .long 0x59800000 /* TWO52: 2**52 */ | |
| 34 | ||
| 35 | .section ".text" | |
| 36 | ENTRY (__nearbyint) | |
| 37 | #ifdef SHARED | |
| 38 | mflr r11 | |
| 39 | cfi_register(lr,r11) | |
| 40 | bcl 20,31,1f | |
| 41 | 1: mflr r9 | |
| 42 | addis r9,r9,.LC0-1b@ha | |
| 43 | lfs fp13,.LC0-1b@l(r9) | |
| 44 | mtlr r11 | |
| 45 | cfi_same_value (lr) | |
| 46 | #else | |
| 47 | lis r9,.LC0@ha | |
| 48 | lfs fp13,.LC0@l(r9) | |
| 49 | #endif | |
| 50 | fabs fp0,fp1 | |
| 51 | fsub fp12,fp13,fp13 /* generate 0.0 */ | |
| 52 | fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52 */ | |
| debf7618 | 53 | bge cr7,.L10 |
| a1267ba1 AZ |
54 | fcmpu cr7,fp1,fp12 /* if (x > 0.0 */ |
| 55 | ble cr7,L(lessthanzero) | |
| 71d1b016 | 56 | mffs fp11 |
| a1267ba1 | 57 | mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ |
| 8bd70862 AZ |
58 | fadd fp1,fp1,fp13 /* x += TWO52 */ |
| 59 | fsub fp1,fp1,fp13 /* x -= TWO52 */ | |
| a1267ba1 | 60 | fabs fp1,fp1 /* if (x == 0.0 */ |
| 71d1b016 | 61 | mtfsf 0xff,fp11 /* Restore FE_INEXACT state. */ |
| a1267ba1 AZ |
62 | blr |
| 63 | L(lessthanzero): | |
| 64 | bgelr cr7 | |
| 71d1b016 | 65 | mffs fp11 |
| a1267ba1 | 66 | mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ |
| 8bd70862 AZ |
67 | fsub fp1,fp1,fp13 /* x -= TWO52 */ |
| 68 | fadd fp1,fp1,fp13 /* x += TWO52 */ | |
| 69 | fnabs fp1,fp1 /* if (x == 0.0) */ | |
| 71d1b016 | 70 | mtfsf 0xff,fp11 /* Restore FE_INEXACT state. */ |
| a1267ba1 | 71 | blr |
| debf7618 JM |
72 | .L10: |
| 73 | /* Ensure sNaN input is converted to qNaN. */ | |
| 74 | fcmpu cr7,fp1,fp1 | |
| 75 | beqlr cr7 | |
| 76 | fadd fp1,fp1,fp1 | |
| 77 | blr | |
| a1267ba1 AZ |
78 | END (__nearbyint) |
| 79 | ||
| 51ea3b20 | 80 | libm_alias_double (__nearbyint, nearbyint) |