| 1 | /* Round float to int floating-point values, sparc32 v9 version. |
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| 2 | Copyright (C) 2012-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | #include <math_ldbl_opt.h> |
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| 21 | #include <libm-alias-double.h> |
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| 22 | |
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| 23 | /* We pop constants into the FPU registers using the incoming |
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| 24 | argument stack slots, since this avoid having to use any PIC |
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| 25 | references. We also thus avoid having to allocate a register |
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| 26 | window. |
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| 27 | |
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| 28 | VIS instructions are used to facilitate the formation of |
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| 29 | easier constants, and the propagation of the sign bit. */ |
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| 30 | |
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| 31 | #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ |
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| 32 | |
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| 33 | #define ZERO %f10 /* 0.0 */ |
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| 34 | #define SIGN_BIT %f12 /* -0.0 */ |
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| 35 | |
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| 36 | ENTRY (__rint) |
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| 37 | sethi %hi(TWO_FIFTYTWO), %o2 |
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| 38 | sllx %o0, 32, %o0 |
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| 39 | |
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| 40 | or %o0, %o1, %o0 |
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| 41 | fzero ZERO |
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| 42 | |
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| 43 | stx %o0, [%sp + 72] |
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| 44 | sllx %o2, 32, %o2 |
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| 45 | fnegd ZERO, SIGN_BIT |
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| 46 | |
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| 47 | ldd [%sp + 72], %f0 |
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| 48 | |
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| 49 | stx %o2, [%sp + 72] |
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| 50 | fabsd %f0, %f14 |
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| 51 | |
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| 52 | ldd [%sp + 72], %f16 |
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| 53 | fcmpd %fcc3, %f14, %f16 |
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| 54 | |
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| 55 | fmovduge %fcc3, ZERO, %f16 |
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| 56 | fand %f0, SIGN_BIT, SIGN_BIT |
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| 57 | |
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| 58 | for %f16, SIGN_BIT, %f16 |
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| 59 | faddd %f0, %f16, %f6 |
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| 60 | fsubd %f6, %f16, %f0 |
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| 61 | fabsd %f0, %f0 |
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| 62 | retl |
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| 63 | for %f0, SIGN_BIT, %f0 |
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| 64 | END (__rint) |
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| 65 | libm_alias_double (__rint, rint) |
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| 66 | |
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