| 1 | /* Round float to int floating-point values without generating |
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| 2 | an inexact exception, sparc32 v9 version. |
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| 3 | |
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| 4 | Copyright (C) 2013-2024 Free Software Foundation, Inc. |
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| 5 | This file is part of the GNU C Library. |
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| 6 | |
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| 7 | The GNU C Library is free software; you can redistribute it and/or |
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| 8 | modify it under the terms of the GNU Lesser General Public |
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| 9 | License as published by the Free Software Foundation; either |
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| 10 | version 2.1 of the License, or (at your option) any later version. |
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| 11 | |
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| 12 | The GNU C Library is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | Lesser General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU Lesser General Public |
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| 18 | License along with the GNU C Library; if not, see |
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| 19 | <https://www.gnu.org/licenses/>. */ |
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| 20 | |
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| 21 | #include <sysdep.h> |
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| 22 | #include <math_ldbl_opt.h> |
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| 23 | #include <libm-alias-double.h> |
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| 24 | |
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| 25 | /* We pop constants into the FPU registers using the incoming |
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| 26 | argument stack slots, since this avoid having to use any PIC |
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| 27 | references. We also thus avoid having to allocate a register |
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| 28 | window. |
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| 29 | |
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| 30 | VIS instructions are used to facilitate the formation of |
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| 31 | easier constants, and the propagation of the sign bit. */ |
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| 32 | |
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| 33 | #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ |
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| 34 | |
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| 35 | #define ZERO %f10 /* 0.0 */ |
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| 36 | #define SIGN_BIT %f12 /* -0.0 */ |
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| 37 | |
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| 38 | ENTRY (__nearbyint) |
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| 39 | sllx %o0, 32, %o0 |
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| 40 | or %o0, %o1, %o0 |
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| 41 | stx %o0, [%sp + 72] |
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| 42 | ldd [%sp + 72], %f0 |
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| 43 | fcmpd %fcc3, %f0, %f0 /* Check for sNaN */ |
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| 44 | st %fsr, [%sp + 88] |
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| 45 | sethi %hi(TWO_FIFTYTWO), %o2 |
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| 46 | sethi %hi(0xf8003e0), %o5 |
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| 47 | ld [%sp + 88], %o4 |
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| 48 | or %o5, %lo(0xf8003e0), %o5 |
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| 49 | andn %o4, %o5, %o4 |
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| 50 | fzero ZERO |
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| 51 | st %o4, [%sp + 80] |
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| 52 | sllx %o2, 32, %o2 |
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| 53 | fnegd ZERO, SIGN_BIT |
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| 54 | ld [%sp + 80], %fsr |
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| 55 | stx %o2, [%sp + 72] |
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| 56 | fabsd %f0, %f14 |
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| 57 | ldd [%sp + 72], %f16 |
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| 58 | fcmpd %fcc3, %f14, %f16 |
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| 59 | fmovduge %fcc3, ZERO, %f16 |
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| 60 | fand %f0, SIGN_BIT, SIGN_BIT |
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| 61 | for %f16, SIGN_BIT, %f16 |
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| 62 | faddd %f0, %f16, %f6 |
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| 63 | fsubd %f6, %f16, %f0 |
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| 64 | fabsd %f0, %f0 |
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| 65 | for %f0, SIGN_BIT, %f0 |
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| 66 | retl |
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| 67 | ld [%sp + 88], %fsr |
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| 68 | END (__nearbyint) |
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| 69 | libm_alias_double (__nearbyint, nearbyint) |
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| 70 | |
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