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Improve mbedtls_xor docs
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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@ -174,6 +174,14 @@ __attribute__((always_inline))
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* \param a Pointer to input (buffer of at least \p n bytes)
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* \param b Pointer to input (buffer of at least \p n bytes)
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* \param n Number of bytes to process.
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*
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* \note Depending on the situation, it may be faster to use either mbedtls_xor or
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* mbedtls_xor_no_simd (these are functionally equivalent).
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* If the result is used immediately after the xor operation in non-SIMD code (e.g, in
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* AES-CBC), there may be additional latency to transfer the data from SIMD to scalar
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* registers, and in this case, mbedtls_xor_no_simd may be faster. In other cases where
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* the result is not used immediately (e.g., in AES-CTR), mbedtls_xor may be faster.
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* For targets without SIMD support, they will behave the same.
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*/
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static inline void mbedtls_xor(unsigned char *r,
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const unsigned char *a,
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@ -238,6 +246,14 @@ __attribute__((always_inline))
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* \param a Pointer to input (buffer of at least \p n bytes)
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* \param b Pointer to input (buffer of at least \p n bytes)
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* \param n Number of bytes to process.
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*
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* \note Depending on the situation, it may be faster to use either mbedtls_xor or
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* mbedtls_xor_no_simd (these are functionally equivalent).
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* If the result is used immediately after the xor operation in non-SIMD code (e.g, in
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* AES-CBC), there may be additional latency to transfer the data from SIMD to scalar
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* registers, and in this case, mbedtls_xor_no_simd may be faster. In other cases where
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* the result is not used immediately (e.g., in AES-CTR), mbedtls_xor may be faster.
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* For targets without SIMD support, they will behave the same.
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*/
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static inline void mbedtls_xor_no_simd(unsigned char *r,
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const unsigned char *a,
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