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[Bug rtl-optimization/38518] Excessive compile time with -O3
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 26 Jul 2017 09:24:41 +0000
- Subject: [Bug rtl-optimization/38518] Excessive compile time with -O3
- Auto-submitted: auto-generated
- References: <bug-38518-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38518
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Also look at gcc.opensuse.org/ in the c++bench "random" part. At -O2 it shows
df live&initialized regs: 12.12 (31%) usr
backwards jump threading: 6.44 (17%) usr
the backwards jump threading thing is new. Jeff?
At -O3 it runs OOM on vangelis, czerny reports 3.9GB memory use and besides the
above:
load CSE after reload : 120.58 (70%) usr
I try to add most "interesting" compile-time/memory-use testcases to the
C++ tester "random" part so we can track time-report / memory usage issues
there.
I think I've seen the load CSE after reload issue elsewhere, too.