Re^3: Label makes a sub to return empty list -- "secret"? documented?

[ikegami]

Sometimes, I prefer to invert the numbers to get the time saved to put things into perspective.

27367269 calls/s = 37 ns/call
31367629 calls/s = 32 ns/call
35161744 calls/s = 28 ns/call

So _: is 9 ns faster than return (assuming the numbers are meaningful).

After 100 million calls, you still wouldn't have saved a second by switching from return to _:.

Update: I had moved a decimal point in the wrong direction. Fixed.

[hippo]

27367269 calls/s = 0.365 ns/call

I think your numbers are a couple of orders of magnitude out. By my maths 1 / 27367269 = 0.0000000365, so that's 36.5ns per call.

Even so, your point is valid. It is only in extreme cases where any of this is really worth worrying about.

[ikegami]

The numbers seemed absurd, but I was too tired to register I needed to redo the math. I had moved a decimal point in the wrong direction. Fixed.