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Document undefined case. Clarify test code.

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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Dave Rodgman
2023-04-21 12:54:40 +01:00
parent 678e63007c
commit bbf881053d
2 changed files with 19 additions and 9 deletions
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13
library/bignum_core.c
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@ -33,11 +33,18 @@
#include "bn_mul.h"
#include "constant_time_internal.h"
/**
* \brief Count leading zeros
*
* \warning The result is undefined if \p a == 0
*
* \param a The value to operate on
*
* \return The number of leading zeros, if \p a != 0. If \p a == 0, the result
* is undefined.
*/
inline size_t mbedtls_mpi_core_clz(mbedtls_mpi_uint a)
{
/* Note: the result is undefined for a == 0
* (because this is the behaviour of __builtin_clz).
*/
#if defined(__has_builtin)
#if __has_builtin(__builtin_clz)
if (sizeof(mbedtls_mpi_uint) == sizeof(unsigned int)) {