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Use GCC builtins for byte-swapping. Fixes #10800.

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* Introduced in gcc-4.3 for at least Intel platforms
* On ARM, full support added in gcc-4.8
* Other platforms untested, left as-is
* This introduces a breaking change to the ABI for gcc4
This commit is contained in:
Jessica Hamilton 2014-05-04 12:03:11 +12:00
parent 36764b4001
commit 4ffdf2ed40
1 changed files with 11 additions and 2 deletions
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13
headers/os/support/ByteOrder.h
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@ -111,19 +111,28 @@ typedef enum {
#ifdef __cplusplus
extern "C" {
#endif
#endif
extern status_t swap_data(type_code type, void *data, size_t length,
swap_action action);
extern bool is_type_swapped(type_code type);
/* Private implementations */
extern double __swap_double(double arg);
extern float __swap_float(float arg);
#if (defined(__INTEL__) || defined(__x86_64__)) && GCC_VERSION >= 40300
#define __swap_int64(arg) __builtin_bswap64(arg)
#define __swap_int32(arg) __builtin_bswap32(arg)
#define __swap_int16(arg) __builtin_bswap16(arg)
#elif defined(__ARM__) && GCC_VERSION >= 40800
#define __swap_int64(arg) __builtin_bswap64(arg)
#define __swap_int32(arg) __builtin_bswap32(arg)
#define __swap_int16(arg) __builtin_bswap16(arg)
#else
extern uint64 __swap_int64(uint64 arg);
extern uint32 __swap_int32(uint32 arg);
extern uint16 __swap_int16(uint16 arg);
#endif
#ifdef __cplusplus
}