Re: Xcode 5.1 compiler option -Ofast
Re: Xcode 5.1 compiler option -Ofast
- Subject: Re: Xcode 5.1 compiler option -Ofast
- From: Chris Lattner <email@hidden>
- Date: Mon, 17 Mar 2014 21:16:32 -0700
On Mar 14, 2014, at 11:41 AM, Alex Zavatone <email@hidden> wrote:
> Just noticed the new compiler option in Xcode 5.1 called Fastest, Aggressive Optimization.
>
> I didn't see any info on this in the What's New in Xcode docs. Is there any handy reference for this new feature?
Hi Alex,
This option was new in Xcode 5, it isn't new in 5.1. -Ofast is equivalent to turning on -ffast-math (which favors performance over strict IEEE numerics) and -fstrict-aliasing as well as increasing code size. One of the advanced LLVM talks at WWDC 2013 should have discussed it.
-Chris
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