projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 559398ab | 1 | /* floor function, sparc64 vis3 version. |
| f7a9f785 | 2 | Copyright (C) 2012-2016 Free Software Foundation, Inc. |
| 559398ab DM |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by David S. Miller <davem@davemloft.net>, 2012. | |
| 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 | |
| 17 | License along with the GNU C Library; if not, see | |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| 21 | ||
| 8b954ab9 DM |
22 | /* 'siam' (Set Interval Arithmetic Mode) is used to quickly override |
| 23 | the rounding mode during this routine. | |
| 559398ab DM |
24 | |
| 25 | We add then subtract (or subtract than add if the initial | |
| 26 | value was negative) 2**23 to the value, then subtract it | |
| 27 | back out. | |
| 28 | ||
| 8b954ab9 DM |
29 | This will clear out the fractional portion of the value and, |
| 30 | with suitable 'siam' initiated rouding mode settings, round | |
| 31 | the final result in the proper direction. | |
| 559398ab | 32 | |
| 8b954ab9 DM |
33 | We also use VIS3 moves to avoid using the stack to transfer |
| 34 | values between float and integer registers. */ | |
| 559398ab DM |
35 | |
| 36 | #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ | |
| 559398ab DM |
37 | |
| 38 | #define ZERO %f10 /* 0.0 */ | |
| 39 | #define SIGN_BIT %f12 /* -0.0 */ | |
| 40 | ||
| 41 | ENTRY (__floor_vis3) | |
| 42 | sethi %hi(TWO_FIFTYTWO), %o2 | |
| 559398ab | 43 | fzero ZERO |
| 559398ab DM |
44 | sllx %o2, 32, %o2 |
| 45 | fnegd ZERO, SIGN_BIT | |
| 559398ab DM |
46 | movxtod %o2, %f16 |
| 47 | fabsd %f0, %f14 | |
| 559398ab | 48 | fcmpd %fcc3, %f14, %f16 |
| 559398ab DM |
49 | fmovduge %fcc3, ZERO, %f16 |
| 50 | fand %f0, SIGN_BIT, SIGN_BIT | |
| 559398ab | 51 | for %f16, SIGN_BIT, %f16 |
| 8b954ab9 | 52 | siam (1 << 2) | 3 |
| 559398ab | 53 | faddd %f0, %f16, %f18 |
| 8b954ab9 | 54 | siam (1 << 2) | 0 |
| 559398ab | 55 | fsubd %f18, %f16, %f18 |
| 8b954ab9 | 56 | siam (0 << 2) |
| 559398ab | 57 | retl |
| 8b954ab9 | 58 | for %f18, SIGN_BIT, %f0 |
| 559398ab | 59 | END (__floor_vis3) |