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Introduce MBEDTLS_ASSUME

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-07-12 13:16:49 +01:00
parent afc6a992c5
commit fb24a8425a
1 changed files with 15 additions and 0 deletions
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15
library/common.h
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@ -318,6 +318,21 @@ static inline void mbedtls_xor_no_simd(unsigned char *r,
#define MBEDTLS_UNLIKELY(x) x
#endif
#if defined(__has_builtin)
#if __has_builtin(__builtin_assume)
/* MBEDTLS_ASSUME may be used to provide additional information to the compiler
* which can result in smaller code-size. */
#define MBEDTLS_ASSUME(x) __builtin_assume(x)
// clang provides __builtin_assume
#elif __has_builtin(__builtin_unreachable)
#define MBEDTLS_ASSUME(x) do { if (!(x)) __builtin_unreachable(); } while (0)
// For gcc, use __builtin_unreachable
#endif
#endif
#if !defined(MBEDTLS_ASSUME)
#define MBEDTLS_ASSUME(x)
#endif
#if defined(__GNUC__) && !defined(__ARMCC_VERSION) && !defined(__clang__) \
&& !defined(__llvm__) && !defined(__INTEL_COMPILER)
/* Defined if the compiler really is gcc and not clang, etc */