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Re: Compiler slowdowns (was Re: [PATCH] Optimize manual byte swap implementations v2)

OK.

Well, I'm seeing an -O1 compile (with some extra passes thrown in, like -fschedule-insn2) go from 168 seconds to 228.17 seconds in four months. Without a nail to pound down.

That's not directly related to -O2 times or whether bswap optimization is worth 1% compile time, but I'm guessing that a number of similar discussions went on (at least internally) about other patches over those four months, and we've ended up with a big difference. (In the PR I noted a 13% difference just between September 19 and September 26 of last year.)

I don't ever quite remember seeing such a rate of increase in compile time while I've been watching gcc development.

Brad

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