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[Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
- 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, 04 Nov 2013 14:34:25 +0000
- Subject: [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
- Auto-submitted: auto-generated
- References: <bug-58957-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog
Known to work| |4.7.3, 4.9.0
Summary|[4.8 Regression] |[4.8 Regression]
|compilation hangs at -O3 on |compilation slow at -O3 on
|x86_64-linux-gnu (both |x86_64-linux-gnu (both
|32-bit and 64-bit modes) |32-bit and 64-bit modes)
Known to fail| |4.8.0, 4.8.2
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think it's just awfully slow (deep loop nest, possible to unroll completely).
It terminates for me on the branch and for 4.8.2 and 4.8.1.
tree CFG cleanup : 8.49 (88%) usr 0.00 ( 0%) sys 8.52 (87%) wall
783 kB ( 2%) ggc
TOTAL : 9.70 0.06 9.80
51528 kB
on trunk and 4.7.3:
TOTAL : 0.09 0.00 0.10
1865 kB