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142 Branch Optimizations Chapter 6
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
6.9 Far Control-Transfer Instructions
Optimization
Use far control-transfer instructions only when necessary. (Far control-transfer instructions include
the far forms of JMP, CALL, and RET, as well as the INT, INTO, and IRET instructions.)
Application
This optimization applies to:
• 32-bit software
• 64-bit software
Rationale
The processor’s branch-prediction unit, which is used for both conditional and unconditional
branches, does not predict far branches.