------- Additional Comments From tbptbp at gmail dot com 2005-05-09 08:46 ------- I'm going to ping this bugreport because there's still some very bad interaction with gcse in current gcc. Just compile the 'packet_intersection.cpp' testcase with ie g++-4.1-4120050501 for ia32 to convince yourself (x86-64 is apparently immune, thanks to the lower register pressure).
It takes a bit of luck, or the use of -fno-gcse, to dodge that issue which really kills performance. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19680
