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[Bug target/50182] Performance degradation from gcc 4.1 (x86_64)
- From: "oleg at smolsky dot net" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 03 Mar 2012 02:19:21 +0000
- Subject: [Bug target/50182] Performance degradation from gcc 4.1 (x86_64)
- Auto-submitted: auto-generated
- References: <bug-50182-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50182
--- Comment #34 from oleg at smolsky dot net 2012-03-03 02:19:21 UTC ---
OK, here are some benchmark numbers for the test compiled verbatim with
g++41/g++463 -O2:
$ time ./test41
rv=4243767296
real 0m6.063s
user 0m6.058s
sys 0m0.001s
$ time ./test46
rv=4243767296
real 0m11.425s
user 0m11.415s
sys 0m0.003s
$ time ./test46-fast #(ie built it with -DFAST_VER)
rv=4243767296
real 0m11.389s
user 0m11.383s
sys 0m0.003s
Let me see how the sample can be digested further down...