diff options
author | Corinna Vinschen <corinna@vinschen.de> | 2016-03-26 22:33:46 +0300 |
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committer | Corinna Vinschen <corinna@vinschen.de> | 2016-03-26 22:33:46 +0300 |
commit | 799fdda4d24ff3b4224fc95947413fbd570080df (patch) | |
tree | 25132dd4b6a0667d95adf4265a5265e90e60702e /newlib | |
parent | 373f81d17c2ab1ab9a7b37c26c1ed067174a42e5 (diff) |
math.h: Use GCC builtins for C99 macros where available
GCCs builtin functions are mostly type agnostic and architecture
indepedent. Prefer to use them if available.
* libc/include/math.h (fpclassify, isfinite, isinf, isnan,
isnormal): Use matching GCC builtin functions if built with
GCC 4.4 or later.
(signbit): Use matching GCC builtin functions if built with
GCC 4.0 or later.
(isgreater, isgreaterequal, isless, islessequal, islessgreater,
isunordered): Use matching GCC builtin functions if built with
GCC 2.97 or later.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Diffstat (limited to 'newlib')
-rw-r--r-- | newlib/libc/include/math.h | 74 |
1 files changed, 55 insertions, 19 deletions
diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h index a74da888e..eeedeba92 100644 --- a/newlib/libc/include/math.h +++ b/newlib/libc/include/math.h @@ -204,35 +204,70 @@ extern int __fpclassifyd (double x); extern int __signbitf (float x); extern int __signbitd (double x); -#define fpclassify(__x) \ - ((sizeof(__x) == sizeof(float)) ? __fpclassifyf(__x) : \ - __fpclassifyd(__x)) - -#ifndef isfinite - #define isfinite(__y) \ - (__extension__ ({int __cy = fpclassify(__y); \ - __cy != FP_INFINITE && __cy != FP_NAN;})) -#endif - /* Note: isinf and isnan were once functions in newlib that took double * arguments. C99 specifies that these names are reserved for macros * supporting multiple floating point types. Thus, they are * now defined as macros. Implementations of the old functions * taking double arguments still exist for compatibility purposes * (prototypes for them are in <ieeefp.h>). */ -#ifndef isinf - #define isinf(y) (fpclassify(y) == FP_INFINITE) -#endif -#ifndef isnan - #define isnan(y) (fpclassify(y) == FP_NAN) +#if __GNUC_PREREQ (4, 4) + #define fpclassify(__x) (__builtin_fpclassify (FP_NAN, FP_INFINITE, \ + FP_NORMAL, FP_SUBNORMAL, \ + FP_ZERO, __x)) + #ifndef isfinite + #define isfinite(__x) (__builtin_isfinite (__x)) + #endif + #ifndef isinf + #define isinf(__x) (__builtin_isinf_sign (__x)) + #endif + #ifndef isnan + #define isnan(__x) (__builtin_isnan (__x)) + #endif + #define isnormal(__x) (__builtin_isnormal (__x)) +#else + #define fpclassify(__x) \ + ((sizeof(__x) == sizeof(float)) ? __fpclassifyf(__x) : \ + __fpclassifyd(__x)) + #ifndef isfinite + #define isfinite(__y) \ + (__extension__ ({int __cy = fpclassify(__y); \ + __cy != FP_INFINITE && __cy != FP_NAN;})) + #endif + #ifndef isinf + #define isinf(__x) (fpclassify(__x) == FP_INFINITE) + #endif + #ifndef isnan + #define isnan(__x) (fpclassify(__x) == FP_NAN) + #endif + #define isnormal(__x) (fpclassify(__x) == FP_NORMAL) #endif -#define isnormal(y) (fpclassify(y) == FP_NORMAL) -#define signbit(__x) \ - ((sizeof(__x) == sizeof(float)) ? __signbitf(__x) : \ - __signbitd(__x)) +#if __GNUC_PREREQ (4, 0) + #if defined(_HAVE_LONG_DOUBLE) + #define signbit(__x) \ + ((sizeof(__x) == sizeof(float)) ? __builtin_signbitf(__x) : \ + (sizeof(__x) == sizeof(double)) ? __builtin_signbit (__x) : \ + __builtin_signbitl(__x)) + #else + #define signbit(__x) \ + ((sizeof(__x) == sizeof(float)) ? __builtin_signbitf(__x) : \ + __builtin_signbit (__x)) + #endif +#else + #define signbit(__x) \ + ((sizeof(__x) == sizeof(float)) ? __signbitf(__x) : \ + __signbitd(__x)) +#endif +#if __GNUC_PREREQ (2, 97) +#define isgreater(__x,__y) (__builtin_isgreater (__x, __y)) +#define isgreaterequal(__x,__y) (__builtin_isgreaterequal (__x, __y)) +#define isless(__x,__y) (__builtin_isless (__x, __y)) +#define islessequal(__x,__y) (__builtin_islessequal (__x, __y)) +#define islessgreater(__x,__y) (__builtin_islessgreater (__x, __y)) +#define isunordered(__x,__y) (__builtin_isunordered (__x, __y)) +#else #define isgreater(x,y) \ (__extension__ ({__typeof__(x) __x = (x); __typeof__(y) __y = (y); \ !isunordered(__x,__y) && (__x > __y);})) @@ -252,6 +287,7 @@ extern int __signbitd (double x); #define isunordered(a,b) \ (__extension__ ({__typeof__(a) __a = (a); __typeof__(b) __b = (b); \ fpclassify(__a) == FP_NAN || fpclassify(__b) == FP_NAN;})) +#endif /* Non ANSI long double precision functions. */ |