Random_Number

Generate random number.

Random_Number PROTO base:QWORD

Parameters

base - Zero based range for random output. If 0 then it used the time stamp counter to generate a value from.

Returns

In RAX a random number.

Notes

A Park Miller random algorithm written by Jaymeson Trudgen (NaN) and optimised by Rickey Bowers Jr. (bitRAKE).

x64 version now uses RDRAND if available instead.

On a CPU that supports the RDRAND instruction, this is used instead of the original code path ported from the x86 function in the MASM32 Library.

For a CPU that doesnt support RDRAND, we also allow base parameter to be a 0, which will use the time stamp counter to generate a value for us.

nrandom_seed global variable is used to store a seed value generated from the Random_Seed function (or default value of 12345678) that is used for CPU’s that dont support RDRAND to generate a random number.