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[Bug rtl-optimization/59811] [4.8/4.9 Regression] Huge increase in memory usage and compile time in combine
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 22 Jan 2014 15:16:31 +0000
- Subject: [Bug rtl-optimization/59811] [4.8/4.9 Regression] Huge increase in memory usage and compile time in combine
- Auto-submitted: auto-generated
- References: <bug-59811-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59811
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With -O2 -fno-automatic -ffixed-line-length-none --param
sccvn-max-alias-queries-per-access=1300 the combiner completely disappears out
of the picture, supposedly because then FRE/PRE doesn't give up, with 1200 the
combiner already takes 17% of compile time and 77% of memory, with the default
1000 it takes 58% of compile time and 96% of memory.