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A comment on Ask HN: What are some examples of beautiful x86 assembly code?. Parent comment

Re:Ask HN: What are some examples of beautiful x86 assembly ... by dangerbird2 on Friday April 27, 2018 @04:05PM (#16943861)
It's a hardware register, so it has always has a value (in 64-bit mode, at least), whether or not the program explicitly sets it.
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