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Reference.org
Speculative multithreading
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<p>Thread Level Speculation (TLS), also known as Speculative Multi-threading, or Speculative Parallelization, is a technique to <a href="/facts/Speculatively_execute/AkA84o5n">speculatively execute</a> a section of computer code that is anticipated to be executed later in parallel with the normal execution on a separate independent <a href="/facts/Thread_(computing)/hh8WHyPd">thread</a>. Such a speculative thread may need to make assumptions about the values of input variables. If these prove to be invalid, then the portions of the speculative thread that rely on these input variables will need to be discarded and squashed. If the assumptions are correct the program can complete in a shorter time provided the thread was able to be scheduled efficiently. </p>