about summary refs log tree commit diff
path: root/sysdeps/x86/fpu/math-barriers.h
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/x86/fpu/math-barriers.h')
-rw-r--r--sysdeps/x86/fpu/math-barriers.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/sysdeps/x86/fpu/math-barriers.h b/sysdeps/x86/fpu/math-barriers.h
new file mode 100644
index 0000000000..1e1fabdb92
--- /dev/null
+++ b/sysdeps/x86/fpu/math-barriers.h
@@ -0,0 +1,61 @@
+/* Control when floating-point expressions are evaluated.  x86 version.
+   Copyright (C) 2007-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef X86_MATH_BARRIERS_H
+#define X86_MATH_BARRIERS_H 1
+
+#ifdef __SSE2_MATH__
+# define math_opt_barrier(x)						\
+  ({ __typeof(x) __x;							\
+     if (sizeof (x) <= sizeof (double)					\
+	|| __builtin_types_compatible_p (__typeof (x), _Float128))	\
+       __asm ("" : "=x" (__x) : "0" (x));				\
+     else								\
+       __asm ("" : "=t" (__x) : "0" (x));				\
+     __x; })
+# define math_force_eval(x)						\
+  do {									\
+    if (sizeof (x) <= sizeof (double)					\
+	|| __builtin_types_compatible_p (__typeof (x), _Float128))	\
+      __asm __volatile ("" : : "x" (x));				\
+    else								\
+      __asm __volatile ("" : : "f" (x));				\
+  } while (0)
+#else
+# define math_opt_barrier(x)						\
+  ({ __typeof (x) __x;							\
+     if (__builtin_types_compatible_p (__typeof (x), _Float128))	\
+       {								\
+	 __x = (x);							\
+	 __asm ("" : "+m" (__x));					\
+       }								\
+     else								\
+       __asm ("" : "=t" (__x) : "0" (x));				\
+     __x; })
+# define math_force_eval(x)						\
+  do {									\
+    __typeof (x) __x = (x);						\
+    if (sizeof (x) <= sizeof (double)					\
+	|| __builtin_types_compatible_p (__typeof (x), _Float128))	\
+      __asm __volatile ("" : : "m" (__x));				\
+    else								\
+      __asm __volatile ("" : : "f" (__x));				\
+  } while (0)
+#endif
+
+#endif