diff options
Diffstat (limited to 'sysdeps/alpha/fpu/bits/fenv.h')
| -rw-r--r-- | sysdeps/alpha/fpu/bits/fenv.h | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/sysdeps/alpha/fpu/bits/fenv.h b/sysdeps/alpha/fpu/bits/fenv.h index 82b85de..b6d9b98 100644 --- 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. */ |