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Re:A CPU Is a Compiler by CalChris on Thursday March 23, 2023 @12:37PM (#35277371)
15 not 14. The instruction-size limit of 15 bytes still applies to instructions with a REX prefix.

Section 2.2.1, Intel® 64 and IA-32 Architectures Software Developer’s Manual

Also, long instructions are infrequent, 96%+ are 7 bytes or less. That's static and dynamic is higher.

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