December 2006
Beginner
320 pages
11h 17m
English
Content preview from Inside the MachineBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Integer Execution Units
Though the Pentium 4’s double-pumped integer execution units got quite a bit of press when Netburst was first announced, you might be surprised to learn that both the G4e and the Pentium 4 embody approaches to enhancing integer performance that are very similar. As you’ll see, this similarity arises from both processors’ application of the computing design dictum: Make the common case fast.
For integer applications, the common case is easy to spot. As I outlined in Chapter 1, integer instructions generally fall into one of two categories:
- Simple/fast integer instructions
Instructions like
addandsubrequire very few steps to complete and are therefore easy to implement with little overhead. These simple instructions make ...
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