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authorMartynas Venckus <martynas@cvs.openbsd.org>2011-04-28 17:34:24 +0000
committerMartynas Venckus <martynas@cvs.openbsd.org>2011-04-28 17:34:24 +0000
commitf70eacf51aa926a56332357f2fd9556df8f52acb (patch)
tree8f92efc601af164ae9d2320e5eeae77bc248a633 /sys/arch/powerpc/include
parent8fbde66430aa8b0773d3387e5e56968cd07a3156 (diff)
fenv improvements and cleanups
Diffstat (limited to 'sys/arch/powerpc/include')
-rw-r--r--sys/arch/powerpc/include/fenv.h36
1 files changed, 23 insertions, 13 deletions
diff --git a/sys/arch/powerpc/include/fenv.h b/sys/arch/powerpc/include/fenv.h
index a09f5bbf7ce..df2ab25c00b 100644
--- a/sys/arch/powerpc/include/fenv.h
+++ b/sys/arch/powerpc/include/fenv.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: fenv.h,v 1.1 2011/04/25 20:34:09 martynas Exp $ */
+/* $OpenBSD: fenv.h,v 1.2 2011/04/28 17:34:23 martynas Exp $ */
/*
* Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
@@ -38,8 +38,9 @@
* The following symbol is simply the bitwise-inclusive OR of all floating-point
* exception constants defined above.
*/
-#define FE_ALL_EXCEPT \
- (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+#define FE_ALL_EXCEPT (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | \
+ FE_OVERFLOW | FE_INVALID)
+#define _MASK_SHIFT 22
/*
* Each symbol representing the rounding direction, expands to an integer
@@ -53,19 +54,28 @@
#define FE_DOWNWARD 0x3
/*
- * FPSCR encodes rounding modes by bits 0-1.
- * FPSCR flags and exception mask shifts by 22.
+ * The following symbol is simply the bitwise-inclusive OR of all floating-point
+ * rounding direction constants defined above.
*/
-#define _ROUND_MASK 0x3
-#define _EMASK_SHIFT 22
+#define _ROUND_MASK (FE_TONEAREST | FE_TOWARDZERO | FE_UPWARD | \
+ FE_DOWNWARD)
/*
- * fenv_t represents the entire floating-point environment
+ * fenv_t represents the entire floating-point environment.
*/
-typedef unsigned int fenv_t;
+typedef unsigned int fenv_t;
-extern fenv_t __fe_dfl_env;
-#define FE_DFL_ENV ((const fenv_t *) &__fe_dfl_env)
+/*
+ * The following constant represents the default floating-point environment
+ * (that is, the one installed at program startup) and has type pointer to
+ * const-qualified fenv_t.
+ *
+ * It can be used as an argument to the functions within the <fenv.h> header
+ * that manage the floating-point environment, namely fesetenv() and
+ * feupdateenv().
+ */
+extern fenv_t __fe_dfl_env;
+#define FE_DFL_ENV ((const fenv_t *)&__fe_dfl_env)
/*
* fexcept_t represents the floating-point status flags collectively, including
@@ -79,6 +89,6 @@ extern fenv_t __fe_dfl_env;
* A floating-point control mode is a system variable whose value may be set by
* the user to affect the subsequent behavior of floating-point arithmetic.
*/
-typedef unsigned int fexcept_t;
+typedef unsigned int fexcept_t;
-#endif /* ! _POWERPC_FENV_H_ */
+#endif /* !_POWERPC_FENV_H_ */