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document why we're not using a straigh `ret`

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edef 2015-04-15 02:06:52 -04:00
parent d06e7c7cdd
commit ae00fa2346
1 changed files with 2 additions and 0 deletions
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src/swap.s
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@ -31,6 +31,8 @@ jmp 2f
movq %rax, %rsp movq %rax, %rsp
// jump into the new context (return to the call point) // jump into the new context (return to the call point)
// doing this instead of a straight `ret` is 8ns slower,
// presumably because the branch predictor tries to be clever about it
popq %rax popq %rax
jmpq *%rax jmpq *%rax