Messages in this thread | | | Date | Fri, 10 Apr 2015 06:18:10 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86: Align jump targets to 1 byte boundaries |
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On 04/10/2015 05:50 AM, Denys Vlasenko wrote: > > However, I'm an -Os guy. Expect -O2 people to disagree :) >
The problem with -Os is that the compiler will make *any* tradeoffs to save a byte. It is really designed to squeeze as much code into a fixed-size chunk, e.g. a ROM, as possible.
We have asked for an -Okernel mode from the gcc folks forever. It basically would mean "-Os except when really dumb."
As far as the 16-byte alignment, my understanding is not that it is related to the I$ but rather is the decoder datum.
-hpa
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