Diego Novillo wrote:
Benjamin Kosnik wrote on 08/22/06 07:56:
Hey y'all. I'm just getting back from vacation and as I re-build my
testing baselines, I've noticed a huge compilation time regression.
This happened sometime post Aug 1, 2006. Anybody else notice?
Yes, something did happen after Aug11. The SPEC testers show a 2-3%
bootstrap time increase from Aug11 to Aug13.
I don't see anything but this:
2006-08-11 Richard Guenther <[EMAIL PROTECTED]>
PR middle-end/28651
* simplify-rtx.c (simplify_const_relational_operation):
Simplify A CMP B to A - B CMP 0 only for EQ and NE comparison
codes.
but a 2-3% increase seems a lot! If it was this patch, it should be
possible to find the place in GCC (or libiberty or libcpp) that is being
badly pessimized.
I'm starting a bootstrap timing comparison to find if this is a red
herring. I'll get the results next morning.
Paolo
