(FE_DENORMAL): New.

(FE_MAP_DMZ, FE_MAP_UMZ, FE_NONIEEE_ENV): New.

diff --git a/sysdeps/alpha/fpu/bits/fenv.h b/sysdeps/alpha/fpu/bits/fenv.h
index 82b85debcdab0d869c997b4ac5b2260e5ba26b07..b6d9b98c86ee60178c1fd9b23fd7f9d8d22cad4e 100644 (file)
--- a/sysdeps/alpha/fpu/bits/fenv.h
+++ b/sysdeps/alpha/fpu/bits/fenv.h
@@ -36,6 +36,11 @@
 
 enum
   {
+#ifdef __USE_GNU
+    FE_DENORMAL =      1UL << 22,
+#define FE_DENORMAL    FE_DENORMAL
+#endif
+
     FE_INEXACT =       1UL << 21,
 #define FE_INEXACT     FE_INEXACT
 
@@ -51,12 +56,10 @@ enum
     FE_INVALID =       1UL << 17,
 #define FE_INVALID     FE_INVALID
 
-    FE_ALL_EXCEPT =
-       (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+    FE_ALL_EXCEPT =    0x3f << 17
 #define FE_ALL_EXCEPT  FE_ALL_EXCEPT
   };
 
-
 /* Alpha chips support all four defined rouding modes.
 
    Note that code must be compiled to use dynamic rounding (/d) instructions
@@ -81,6 +84,19 @@ enum
 #define FE_UPWARD      FE_UPWARD
   };
 
+#ifdef __USE_GNU
+/* On later hardware, and later kernels for earlier hardware, we can forcibly
+   underflow denormal inputs and outputs.  This can speed up certain programs
+   significantly, usually without affecting accuracy.  */
+enum
+  {
+    FE_MAP_DMZ =       1UL << 12,      /* Map denorm inputs to zero */
+#define FE_MAP_DMZ     FE_MAP_DMZ
+
+    FE_MAP_UMZ =       1UL << 13,      /* Map underflowed outputs to zero */
+#define FE_MAP_UMZ     FE_MAP_UMZ
+  };
+#endif
 
 /* Type representing exception flags.  */
 typedef unsigned long int fexcept_t;
@@ -96,6 +112,10 @@ typedef unsigned long int fenv_t;
 #ifdef __USE_GNU
 /* Floating-point environment where none of the exceptions are masked.  */
 # define FE_NOMASK_ENV ((fenv_t *) 0x880000000000003eUL)
+
+/* Floating-point environment with (processor-dependent) non-IEEE floating
+   point.  In this case, mapping denormals to zero.  */
+# define FE_NONIEEE_ENV ((fenv_t *) 0x8800000000003000UL)
 #endif
 
 /* The system calls to talk to the kernel's FP code.  */