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comment fix: it's 8ns *faster*

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edef 2015-04-16 12:20:57 -04:00
parent a1e4c2b745
commit 52325b07c0
1 changed files with 3 additions and 2 deletions
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5
src/arch/x86_64/swap.s
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@ -36,8 +36,9 @@ jmp 2f
movq %rax, %rsp
// 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
// doing this instead of a straight `ret` is 8ns faster,
// presumably because the branch predictor tries
// to be clever about it otherwise
popq %rax
jmpq *%rax