projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| a1267ba1 | 1 | /* Round to int floating-point values. PowerPC32 version. |
| d4697bc9 | 2 | Copyright (C) 2011-2014 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> | |
| 25 | ||
| 26 | ||
| 27 | /* double [fp1] nearbyint(double [fp1] x) */ | |
| 28 | ||
| 29 | .section .rodata.cst4,"aM",@progbits,4 | |
| 30 | .align 2 | |
| 31 | .LC0: /* 2**52 */ | |
| 32 | .long 0x59800000 /* TWO52: 2**52 */ | |
| 33 | ||
| 34 | .section ".text" | |
| 35 | ENTRY (__nearbyint) | |
| 36 | #ifdef SHARED | |
| 37 | mflr r11 | |
| 38 | cfi_register(lr,r11) | |
| 39 | bcl 20,31,1f | |
| 40 | 1: mflr r9 | |
| 41 | addis r9,r9,.LC0-1b@ha | |
| 42 | lfs fp13,.LC0-1b@l(r9) | |
| 43 | mtlr r11 | |
| 44 | cfi_same_value (lr) | |
| 45 | #else | |
| 46 | lis r9,.LC0@ha | |
| 47 | lfs fp13,.LC0@l(r9) | |
| 48 | #endif | |
| 49 | fabs fp0,fp1 | |
| 50 | fsub fp12,fp13,fp13 /* generate 0.0 */ | |
| 51 | fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52 */ | |
| 52 | bgelr cr7 | |
| 53 | fcmpu cr7,fp1,fp12 /* if (x > 0.0 */ | |
| 54 | ble cr7,L(lessthanzero) | |
| 55 | mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ | |
| 56 | fadd fp0,fp1,fp13 /* x += TWO52 */ | |
| 57 | fsub fp1,fp0,fp13 /* x -= TWO52 */ | |
| 58 | fabs fp1,fp1 /* if (x == 0.0 */ | |
| 59 | mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ | |
| 60 | blr | |
| 61 | L(lessthanzero): | |
| 62 | bgelr cr7 | |
| 63 | mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ | |
| 64 | fsub fp0,fp13,fp1 /* x -= TWO52 */ | |
| 65 | fsub fp0,fp0,fp13 /* x += TWO52 */ | |
| 66 | fneg fp1,fp0 /* if (x == 0.0) */ | |
| 67 | mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ | |
| 68 | blr | |
| 69 | END (__nearbyint) | |
| 70 | ||
| 71 | weak_alias (__nearbyint, nearbyint) | |
| 72 | ||
| 73 | #ifdef NO_LONG_DOUBLE | |
| 74 | weak_alias (__nearbyint, nearbyintl) | |
| 75 | strong_alias (__nearbyint, __nearbyintl) | |
| 76 | #endif | |
| 412bd966 AS |
77 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) |
| 78 | compat_symbol (libm, __nearbyint, nearbyintl, GLIBC_2_1) | |
| a1267ba1 | 79 | #endif |