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Random number generator (device): Difference between revisions
X86 Assembly - RDRAND
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=={{header|UNIX Shell}}==
<lang UNIX Shell>od -An -N 4 -t u4 /dev/urandom</lang>
=={{header|X86 Assembly}}==
Processors supporting the new RDRAND feature can generate a random 32-bit integer in two instructions:
<lang x86>L: rdrand eax
jnc L</lang>
RDRAND reads the CPU's cryptographically-secure hardware random number generator. The loop is needed because RDRAND can occasionally fail to retrieve a value — it sets the carry flag to indicate whether it succeeded.
=={{header|XPL0}}==
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