| 1 | /* Control when floating-point expressions are evaluated. x86 version. |
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| 2 | Copyright (C) 2007-2022 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 | #ifndef X86_MATH_BARRIERS_H |
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| 20 | #define X86_MATH_BARRIERS_H 1 |
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| 21 | |
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| 22 | #ifdef __SSE2_MATH__ |
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| 23 | # define math_opt_barrier(x) \ |
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| 24 | ({ __typeof(x) __x; \ |
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| 25 | if (sizeof (x) <= sizeof (double) \ |
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| 26 | || __builtin_types_compatible_p (__typeof (x), _Float128)) \ |
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| 27 | __asm ("" : "=x" (__x) : "0" (x)); \ |
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| 28 | else \ |
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| 29 | __asm ("" : "=t" (__x) : "0" (x)); \ |
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| 30 | __x; }) |
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| 31 | # define math_force_eval(x) \ |
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| 32 | do { \ |
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| 33 | if (sizeof (x) <= sizeof (double) \ |
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| 34 | || __builtin_types_compatible_p (__typeof (x), _Float128)) \ |
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| 35 | __asm __volatile ("" : : "x" (x)); \ |
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| 36 | else \ |
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| 37 | __asm __volatile ("" : : "f" (x)); \ |
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| 38 | } while (0) |
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| 39 | #else |
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| 40 | # define math_opt_barrier(x) \ |
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| 41 | ({ __typeof (x) __x; \ |
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| 42 | if (__builtin_types_compatible_p (__typeof (x), _Float128)) \ |
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| 43 | { \ |
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| 44 | __x = (x); \ |
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| 45 | __asm ("" : "+m" (__x)); \ |
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| 46 | } \ |
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| 47 | else \ |
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| 48 | __asm ("" : "=t" (__x) : "0" (x)); \ |
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| 49 | __x; }) |
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| 50 | # define math_force_eval(x) \ |
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| 51 | do { \ |
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| 52 | __typeof (x) __x = (x); \ |
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| 53 | if (sizeof (x) <= sizeof (double) \ |
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| 54 | || __builtin_types_compatible_p (__typeof (x), _Float128)) \ |
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| 55 | __asm __volatile ("" : : "m" (__x)); \ |
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| 56 | else \ |
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| 57 | __asm __volatile ("" : : "f" (__x)); \ |
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| 58 | } while (0) |
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| 59 | #endif |
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| 60 | |
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| 61 | #endif |
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| 62 | |
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