Porting from SLES9/EM64T to SLES9/AMD64

Hi, After porting a C++ application from SLES9/EM64T architecture to SLES9/AMD64, it fails to work. Apparently, looks like a stack corruption is happening. It works perfect on SLES9/EM64T arch. Any idea what might have gone wrong? Env is same on both boxes and gcc used was 3.3.2 to build the application. Any input is highly appreciated. Thanks Rajib