The sample code runs 30-50% slower on my machine when compiled with 3.4.3 as
opposed to 3.3.4. It creates some objects and then references them via pointer
lookup, so my best guess is that somehow 3.4.3 binaries have many more cache
misses.
I have noticed the severe regression on AMD Athlon 3200 running linux 2.6, with
compile options -O3 -march=k8. Other options (e.g. -O2 instead) don't help.
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Summary: pointer lookup cache misses more frequent
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kpmassey at gmail dot com
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316
