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