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(FE_DENORMAL): New.

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(FE_MAP_DMZ, FE_MAP_UMZ, FE_NONIEEE_ENV): New.
This commit is contained in:
Ulrich Drepper 2000-08-19 16:07:53 +00:00
parent c9bca5114f
commit 1829753231
1 changed files with 23 additions and 3 deletions
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26
sysdeps/alpha/fpu/bits/fenv.h
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@ -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. */