diff options
| author | Conrad Meyer <cem@FreeBSD.org> | 2018-10-22 20:00:30 +0000 |
|---|---|---|
| committer | Conrad Meyer <cem@FreeBSD.org> | 2018-10-22 20:00:30 +0000 |
| commit | 706cfae467a217cc786fd96a72cc2e33c61987e4 (patch) | |
| tree | e7673904660df47b5abd9a1c33cf982a514dac66 /lib/common/mem.h | |
| parent | 42239e68a5cfba3b37b054425eace8d14e0844e3 (diff) | |
Notes
Diffstat (limited to 'lib/common/mem.h')
| -rw-r--r-- | lib/common/mem.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/lib/common/mem.h b/lib/common/mem.h index 47d2300177c0a..5da248756ffd4 100644 --- a/lib/common/mem.h +++ b/lib/common/mem.h @@ -39,6 +39,10 @@ extern "C" { # define MEM_STATIC static /* this version may generate warnings for unused static functions; disable the relevant warning */ #endif +#ifndef __has_builtin +# define __has_builtin(x) 0 /* compat. with non-clang compilers */ +#endif + /* code only tested on 32 and 64 bits systems */ #define MEM_STATIC_ASSERT(c) { enum { MEM_static_assert = 1/(int)(!!(c)) }; } MEM_STATIC void MEM_check(void) { MEM_STATIC_ASSERT((sizeof(size_t)==4) || (sizeof(size_t)==8)); } @@ -57,11 +61,23 @@ MEM_STATIC void MEM_check(void) { MEM_STATIC_ASSERT((sizeof(size_t)==4) || (size typedef uint64_t U64; typedef int64_t S64; #else +# include <limits.h> +#if CHAR_BIT != 8 +# error "this implementation requires char to be exactly 8-bit type" +#endif typedef unsigned char BYTE; +#if USHRT_MAX != 65535 +# error "this implementation requires short to be exactly 16-bit type" +#endif typedef unsigned short U16; typedef signed short S16; +#if UINT_MAX != 4294967295 +# error "this implementation requires int to be exactly 32-bit type" +#endif typedef unsigned int U32; typedef signed int S32; +/* note : there are no limits defined for long long type in C90. + * limits exist in C99, however, in such case, <stdint.h> is preferred */ typedef unsigned long long U64; typedef signed long long S64; #endif @@ -186,7 +202,8 @@ MEM_STATIC U32 MEM_swap32(U32 in) { #if defined(_MSC_VER) /* Visual Studio */ return _byteswap_ulong(in); -#elif defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403) +#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \ + || (defined(__clang__) && __has_builtin(__builtin_bswap32)) return __builtin_bswap32(in); #else return ((in << 24) & 0xff000000 ) | @@ -200,7 +217,8 @@ MEM_STATIC U64 MEM_swap64(U64 in) { #if defined(_MSC_VER) /* Visual Studio */ return _byteswap_uint64(in); -#elif defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403) +#elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \ + || (defined(__clang__) && __has_builtin(__builtin_bswap64)) return __builtin_bswap64(in); #else return ((in << 56) & 0xff00000000000000ULL) | |