| /* Truncate argument to nearest integral value not larger than |
| the argument, sparc64 version. |
| |
| Copyright (C) 2013-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David S. Miller <davem@davemloft.net>, 2013. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| |
| /* We pop constants into the FPU registers using the incoming |
| argument stack slots, since this avoid having to use any PIC |
| references. We also thus avoid having to allocate a register |
| window. |
| |
| VIS instructions are used to facilitate the formation of |
| easier constants, and the propagation of the sign bit. */ |
| |
| #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ |
| |
| #define ZERO %f10 /* 0.0 */ |
| #define SIGN_BIT %f12 /* -0.0 */ |
| |
| ENTRY (__trunc) |
| sethi %hi(TWO_FIFTYTWO), %o2 |
| sllx %o2, 32, %o2 |
| fzero ZERO |
| fnegd ZERO, SIGN_BIT |
| stx %o2, [%sp + STACK_BIAS + 128] |
| fabsd %f0, %f14 |
| ldd [%sp + STACK_BIAS + 128], %f16 |
| fcmpd %fcc3, %f14, %f16 |
| fmovduge %fcc3, ZERO, %f14 |
| fand %f0, SIGN_BIT, SIGN_BIT |
| fdtox %f14, %f14 |
| fxtod %f14, %f14 |
| faddd %f0, ZERO, %f18 |
| fmovduge %fcc3, %f18, %f14 |
| retl |
| for %f14, SIGN_BIT, %f0 |
| END (__trunc) |
| weak_alias (__trunc, trunc) |
