projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 559398ab | 1 | /* Float floor function, sparc64 vis3 version. |
| d4697bc9 | 2 | Copyright (C) 2012-2014 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_TWENTYTHREE 0x4b000000 /* 2**23 */ | |
| 559398ab DM |
37 | |
| 38 | #define ZERO %f10 /* 0.0 */ | |
| 39 | #define SIGN_BIT %f12 /* -0.0 */ | |
| 40 | ||
| 41 | ENTRY (__floorf_vis3) | |
| 42 | sethi %hi(TWO_TWENTYTHREE), %o2 | |
| 559398ab | 43 | fzeros ZERO |
| 559398ab | 44 | fnegs ZERO, SIGN_BIT |
| 8b954ab9 | 45 | movwtos %o2, %f16 |
| 559398ab | 46 | fabss %f1, %f14 |
| 559398ab | 47 | fcmps %fcc3, %f14, %f16 |
| 559398ab DM |
48 | fmovsuge %fcc3, ZERO, %f16 |
| 49 | fands %f1, SIGN_BIT, SIGN_BIT | |
| 559398ab | 50 | fors %f16, SIGN_BIT, %f16 |
| 8b954ab9 | 51 | siam (1 << 2) | 3 |
| 559398ab | 52 | fadds %f1, %f16, %f5 |
| 8b954ab9 | 53 | siam (1 << 2) | 0 |
| 559398ab | 54 | fsubs %f5, %f16, %f5 |
| 8b954ab9 | 55 | siam (0 << 2) |
| 559398ab | 56 | retl |
| 8b954ab9 | 57 | fors %f5, SIGN_BIT, %f0 |
| 559398ab | 58 | END (__floorf_vis3) |