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[Bug middle-end/64928] [5/6/7/8 Regression] Inordinate cpu time and memory usage in "phase opt and generate" with -ftest-coverage -fprofile-arcs
- 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: Mon, 21 Aug 2017 14:19:51 +0000
- Subject: [Bug middle-end/64928] [5/6/7/8 Regression] Inordinate cpu time and memory usage in "phase opt and generate" with -ftest-coverage -fprofile-arcs
- Auto-submitted: auto-generated
- References: <bug-64928-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64928
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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Last reconfirmed|2015-02-09 00:00:00 |2017-8-21
--- Comment #24 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think we made LIM more powerful and/or changed coalescing. We didn't really
address the issue with LIMs lack of a costmodel or out-of-SSA coalescing being
quadratic in size requirement (but I see RTL passes bumping up to 5GB of memory
use as well, REE for example, also noted elsewhere).