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Re: Combine four insns


On 08/10/2010 09:47 AM, Andi Kleen wrote:
To be honest I didn't fully understand why it's ok for -Os
to be 1% slower. A lot of people use -Os.

Yes, and they expect the smallest code possible. This patch does seem to help for that.

They also expect reasonable fast compilation.



If they did, their expectation wouldn't have come from having read the documentation. As far as I can see, the *only* thing one should expect from -Os is smaller code.


We would all like fast compilation, but if you specify -Os, it seems to me that you are expressing a preference for smaller code.

David Daney


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