Gfortran compiler optimization flags similar to ifort in Intel

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I am currently using ifort (Intel Fortran compiler). However, in the AMD cluster (which has AMD processors), it seems that Intel parallel studio can not be installed. Therefore I decided to use gfortran (GNU Fortran compiler) instead of ifort. In ifort, my compiler flags were ftn -heap-arrays -mcmodel=large -g -c I want to know the similar optimization flags in the GNU compiler. My GCC version is 4.4.7 in centos 6.6 and the rocks cluster version is 6.2.

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