4 ms·

This is very hyperbolic and inaccurate. In 2023 it's not a 1-2% performance penalty anymore and certainly not for most use cases. Only if the 15th register is

This is very hyperbolic and inaccurate. In 2023 it's not a 1-2% performance penalty anymore and certainly not for most use cases. Only if the 15th register is critical for performance on an x86_64 CPU. Certain workloads might suffer more, but most will certainly suffer less than a 1-2% hit.

akira2501 3y ago
Using any of the higher 8 registers on an x86_64 requires an opcode prefix and makes your instruction 1 byte longer. There is still a small reward for avoiding r8-r15.
issafram 3y ago
very allegorical