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Bradley Lucier wrote:I believe you are wrong. I've just check trunk right before removing the old RA on x86_64 native and x86_64->ppc64 cross toolchain built with --enable-checking=release. I got the following gcc compilation times on the test
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.
The obvious culprit here is IRA, but I may be wrong.
old IRA native 108.77s 103.19s ppc 160.90s 160.69s
It might be true but I would not do such conclusion on this extreme test which is quite different from most programs.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 think if you can nail down the day in that week and file a separate PR, something *will* be done.
I don't ever quite remember seeing such a rate of increase in compile
time while I've been watching gcc development.
I agree on this.
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