1 /* Control when floating-point expressions are evaluated. x86 version. 2 Copyright (C) 2007-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef X86_MATH_BARRIERS_H 20 #define X86_MATH_BARRIERS_H 1 21 22 #ifdef __SSE2_MATH__ 23 # define math_opt_barrier(x) \ 24 ({ __typeof(x) __x; \ 25 if (sizeof (x) <= sizeof (double) \ 26 || __builtin_types_compatible_p (__typeof (x), _Float128)) \ 27 __asm ("" : "=x" (__x) : "0" (x)); \ 28 else \ 29 __asm ("" : "=t" (__x) : "0" (x)); \ 30 __x; }) 31 # define math_force_eval(x) \ 32 do { \ 33 if (sizeof (x) <= sizeof (double) \ 34 || __builtin_types_compatible_p (__typeof (x), _Float128)) \ 35 __asm __volatile ("" : : "x" (x)); \ 36 else \ 37 __asm __volatile ("" : : "f" (x)); \ 38 } while (0) 39 #else 40 # define math_opt_barrier(x) \ 41 ({ __typeof (x) __x; \ 42 if (__builtin_types_compatible_p (__typeof (x), _Float128)) \ 43 { \ 44 __x = (x); \ 45 __asm ("" : "+m" (__x)); \ 46 } \ 47 else \ 48 __asm ("" : "=t" (__x) : "0" (x)); \ 49 __x; }) 50 # define math_force_eval(x) \ 51 do { \ 52 __typeof (x) __x = (x); \ 53 if (sizeof (x) <= sizeof (double) \ 54 || __builtin_types_compatible_p (__typeof (x), _Float128)) \ 55 __asm __volatile ("" : : "m" (__x)); \ 56 else \ 57 __asm __volatile ("" : : "f" (__x)); \ 58 } while (0) 59 #endif 60 61 #endif 62