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Support built-in byteswap routines from clang, gcc, MSVC

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2022-11-28 14:52:45 +00:00
parent a5110b0d79
commit f7f1f748e3
1 changed files with 49 additions and 0 deletions
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49
library/alignment.h
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@ -25,6 +25,7 @@
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "mbedtls/build_info.h"
@ -120,13 +121,58 @@ inline void mbedtls_put_unaligned_uint64( void *p, uint64_t x )
#define MBEDTLS_BYTE_6( x ) ( (uint8_t) ( ( ( x ) >> 48 ) & 0xff ) )
#define MBEDTLS_BYTE_7( x ) ( (uint8_t) ( ( ( x ) >> 56 ) & 0xff ) )
/*
* Detect GCC built-in byteswap routines
*/
#if defined(__GNUC__) && defined(__GNUC_PREREQ)
#if __GNUC_PREREQ(4,8)
#define MBEDTLS_BSWAP16 __builtin_bswap16
#endif /* __GNUC_PREREQ(4,8) */
#if __GNUC_PREREQ(4,3)
#define MBEDTLS_BSWAP32 __builtin_bswap32
#define MBEDTLS_BSWAP64 __builtin_bswap64
#endif /* __GNUC_PREREQ(4,3) */
#endif /* defined(__GNUC__) && defined(__GNUC_PREREQ) */
/*
* Detect Clang built-in byteswap routines
*/
#if defined(__clang__) && defined(__has_builtin)
#if __has_builtin(__builtin_bswap16)
#define MBEDTLS_BSWAP16 __builtin_bswap16
#endif /* __has_builtin(__builtin_bswap16) */
#if __has_builtin(__builtin_bswap32)
#define MBEDTLS_BSWAP32 __builtin_bswap32
#endif /* __has_builtin(__builtin_bswap32) */
#if __has_builtin(__builtin_bswap64)
#define MBEDTLS_BSWAP64 __builtin_bswap64
#endif /* __has_builtin(__builtin_bswap64) */
#endif /* defined(__clang__) && defined(__has_builtin) */
/*
* Detect MSVC built-in byteswap routines
*/
#if defined(_MSC_VER)
#define MBEDTLS_BSWAP16 _byteswap_ushort
#define MBEDTLS_BSWAP32 _byteswap_ulong
#define MBEDTLS_BSWAP64 _byteswap_uint64
#endif /* defined(_MSC_VER) */
/*
* Where compiler built-ins are not present, fall back to C code that the
* compiler may be able to detect and transform into the relevant bswap or
* similar instruction.
*/
#if !defined(MBEDTLS_BSWAP16)
static inline uint16_t mbedtls_bswap16( uint16_t x ) {
return
( x & 0x00ff ) << 8 |
( x & 0xff00 ) >> 8;
}
#define MBEDTLS_BSWAP16 mbedtls_bswap16
#endif /* !defined(MBEDTLS_BSWAP16) */
#if !defined(MBEDTLS_BSWAP32)
static inline uint32_t mbedtls_bswap32( uint32_t x ) {
return
( x & 0x000000ff ) << 24 |
@ -135,7 +181,9 @@ static inline uint32_t mbedtls_bswap32( uint32_t x ) {
( x & 0xff000000 ) >> 24;
}
#define MBEDTLS_BSWAP32 mbedtls_bswap32
#endif /* !defined(MBEDTLS_BSWAP32) */
#if !defined(MBEDTLS_BSWAP64)
static inline uint64_t mbedtls_bswap64( uint64_t x ) {
return
( x & 0x00000000000000ff ) << 56 |
@ -148,6 +196,7 @@ static inline uint64_t mbedtls_bswap64( uint64_t x ) {
( x & 0xff00000000000000 ) >> 56;
}
#define MBEDTLS_BSWAP64 mbedtls_bswap64
#endif /* !defined(MBEDTLS_BSWAP64) */
#if !defined(__BYTE_ORDER__)
static const uint16_t mbedtls_byte_order_detector = { 0x100 };