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- diff --git a/crypto/bn/rsa_sup_mul.c b/crypto/bn/rsa_sup_mul.c
- --- a/crypto/bn/rsa_sup_mul.c
- +++ b/crypto/bn/rsa_sup_mul.c
- @@ -109,7 +109,7 @@ static ossl_inline void _mul_limb(limb_t *hi, limb_t *lo, limb_t a, limb_t b)
- *hi = t >> LIMB_BIT_SIZE;
- *lo = (limb_t)t;
- }
- -#elif (BN_BYTES == 8) && (defined _MSC_VER)
- +#elif (BN_BYTES == 8) && (defined _MSC_VER) && (defined(_M_AMD64) || defined(_M_X64))
- /* https://learn.microsoft.com/en-us/cpp/intrinsics/umul128?view=msvc-170 */
- #pragma intrinsic(_umul128)
- static ossl_inline void _mul_limb(limb_t *hi, limb_t *lo, limb_t a, limb_t b)
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