Re: VIRT_ADDR

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Re: VIRT_ADDR_VARIES

From: Eli Zaretskii

Subject: Re: VIRT_ADDR_VARIES

Date: 2011年11月10日 20:06:27 +0200

> Date: 2011年11月10日 08:50:39 -0800
> From: Paul Eggert <address@hidden>
> CC: address@hidden
>
> On 11/10/11 08:43, Eli Zaretskii wrote:
> > But why would someone do such a thing?
>
> Performance.
>
> Comparing against my_edata takes just one instruction.
> Comparing against both the start and the end of 'pure'
> takes two comparisons and some glue instructions and
> typically includes a conditional branch.
I'm surprised. Saving a few instructions in something that is never
called inside any time-critical code would be more than just premature
optimization in my book.

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