cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / x86_64-linux-gnu / bits / fenv.h

diff --git a/i686-linux-gnu-4.7/usr/include/x86_64-linux-gnu/bits/fenv.h b/i686-linux-gnu-4.7/usr/include/x86_64-linux-gnu/bits/fenv.h
new file mode 100644 (file)
index 0000000..4103982
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/x86_64-linux-gnu/bits/fenv.h
@@ -0,0 +1,170 @@
+/* Copyright (C) 1997-2018 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 _FENV_H
+# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+/* Define bits representing the exception.  We use the bit positions
+   of the appropriate bits in the FPU control word.  */
+enum
+  {
+    FE_INVALID =
+#define FE_INVALID     0x01
+      FE_INVALID,
+    __FE_DENORM = 0x02,
+    FE_DIVBYZERO =
+#define FE_DIVBYZERO   0x04
+      FE_DIVBYZERO,
+    FE_OVERFLOW =
+#define FE_OVERFLOW    0x08
+      FE_OVERFLOW,
+    FE_UNDERFLOW =
+#define FE_UNDERFLOW   0x10
+      FE_UNDERFLOW,
+    FE_INEXACT =
+#define FE_INEXACT     0x20
+      FE_INEXACT
+  };
+
+#define FE_ALL_EXCEPT \
+       (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+/* The ix87 FPU supports all of the four defined rounding modes.  We
+   use again the bit positions in the FPU control word as the values
+   for the appropriate macros.  */
+enum
+  {
+    FE_TONEAREST =
+#define FE_TONEAREST   0
+      FE_TONEAREST,
+    FE_DOWNWARD =
+#define FE_DOWNWARD    0x400
+      FE_DOWNWARD,
+    FE_UPWARD =
+#define FE_UPWARD      0x800
+      FE_UPWARD,
+    FE_TOWARDZERO =
+#define FE_TOWARDZERO  0xc00
+      FE_TOWARDZERO
+  };
+
+
+/* Type representing exception flags.  */
+typedef unsigned short int fexcept_t;
+
+
+/* Type representing floating-point environment.  This structure
+   corresponds to the layout of the block written by the `fstenv'
+   instruction and has additional fields for the contents of the MXCSR
+   register as written by the `stmxcsr' instruction.  */
+typedef struct
+  {
+    unsigned short int __control_word;
+    unsigned short int __glibc_reserved1;
+    unsigned short int __status_word;
+    unsigned short int __glibc_reserved2;
+    unsigned short int __tags;
+    unsigned short int __glibc_reserved3;
+    unsigned int __eip;
+    unsigned short int __cs_selector;
+    unsigned int __opcode:11;
+    unsigned int __glibc_reserved4:5;
+    unsigned int __data_offset;
+    unsigned short int __data_selector;
+    unsigned short int __glibc_reserved5;
+#ifdef __x86_64__
+    unsigned int __mxcsr;
+#endif
+  }
+fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV     ((const fenv_t *) -1)
+
+#ifdef __USE_GNU
+/* Floating-point environment where none of the exception is masked.  */
+# define FE_NOMASK_ENV ((const fenv_t *) -2)
+#endif
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Type representing floating-point control modes.  */
+typedef struct
+  {
+    unsigned short int __control_word;
+    unsigned short int __glibc_reserved;
+    unsigned int __mxcsr;
+  }
+femode_t;
+
+/* Default floating-point control modes.  */
+# define FE_DFL_MODE   ((const femode_t *) -1L)
+#endif
+
+
+#ifdef __USE_EXTERN_INLINES
+__BEGIN_DECLS
+
+/* Optimized versions.  */
+#ifndef _LIBC
+extern int __REDIRECT_NTH (__feraiseexcept_renamed, (int), feraiseexcept);
+#endif
+__extern_always_inline void
+__NTH (__feraiseexcept_invalid_divbyzero (int __excepts))
+{
+  if ((FE_INVALID & __excepts) != 0)
+    {
+      /* One example of an invalid operation is 0.0 / 0.0.  */
+      float __f = 0.0;
+
+# ifdef __SSE_MATH__
+      __asm__ __volatile__ ("divss %0, %0 " : : "x" (__f));
+# else
+      __asm__ __volatile__ ("fdiv %%st, %%st(0); fwait"
+                           : "=t" (__f) : "0" (__f));
+# endif
+      (void) &__f;
+    }
+  if ((FE_DIVBYZERO & __excepts) != 0)
+    {
+      float __f = 1.0;
+      float __g = 0.0;
+
+# ifdef __SSE_MATH__
+      __asm__ __volatile__ ("divss %1, %0" : : "x" (__f), "x" (__g));
+# else
+      __asm__ __volatile__ ("fdivp %%st, %%st(1); fwait"
+                           : "=t" (__f) : "0" (__f), "u" (__g) : "st(1)");
+# endif
+      (void) &__f;
+    }
+}
+__extern_inline int
+__NTH (feraiseexcept (int __excepts))
+{
+  if (__builtin_constant_p (__excepts)
+      && (__excepts & ~(FE_INVALID | FE_DIVBYZERO)) == 0)
+    {
+      __feraiseexcept_invalid_divbyzero (__excepts);
+      return 0;
+    }
+
+  return __feraiseexcept_renamed (__excepts);
+}
+
+__END_DECLS
+#endif