| 1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #define NO_MATH_REDIRECT |
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| 19 | #include <math.h> |
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| 20 | #include <libm-alias-float.h> |
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| 21 | |
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| 22 | |
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| 23 | float |
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| 24 | __rintf (float x) |
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| 25 | { |
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| 26 | if (isnanf (value: x)) |
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| 27 | return x + x; |
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| 28 | |
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| 29 | if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */ |
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| 30 | { |
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| 31 | /* Note that Alpha S_Floating is stored in registers in a |
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| 32 | restricted T_Floating format, so we don't even need to |
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| 33 | convert back to S_Floating in the end. The initial |
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| 34 | conversion to T_Floating is needed to handle denormals. */ |
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| 35 | |
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| 36 | float tmp1, tmp2, new_x; |
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| 37 | |
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| 38 | __asm ("cvtst/s %3,%2\n\t" |
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| 39 | "cvttq/svid %2,%1\n\t" |
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| 40 | "cvtqt/d %1,%0\n\t" |
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| 41 | : "=f" (new_x), "=&f" (tmp1), "=&f" (tmp2) |
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| 42 | : "f" (x)); |
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| 43 | |
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| 44 | /* rint(-0.1) == -0, and in general we'll always have the same |
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| 45 | sign as our input. */ |
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| 46 | x = copysignf(x: new_x, y: x); |
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| 47 | } |
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| 48 | return x; |
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| 49 | } |
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| 50 | |
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| 51 | libm_alias_float (__rint, rint) |
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| 52 | |
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