On Mar 4, 2005, at 6:57 PM, David Edelsohn wrote:
Edmar Wienskoski writes:
Edmar> I checked with several gcc versions. Some of the spec2k Edmar> benchmarks has a considerable performance loss when Edmar> the benchmark is compiled with a 64 bits tool.
Edmar> I looked into the assembler code generated for try_route (route.c)
Edmar> (compiled with: gcc -S -DSPEC_CPU2000 -O3 -m64 route.c)
Edmar> and notice a considerable number of load instructions in the 64 bits one.
Edmar> Does anyone have an insight on why this is happening ?
GCC 4.0 is a more useful comparison.
It might also just be instruction alignment as vpr is known to be very alignment dependent.
-- Pinski
