Hi, I have a fortran program which I have been compiling for years without problems on g95, gfortran and lahey. Now I try on intel and i get the error message "Illegal instruction" I compile with: ifort AlphaPhase.f90 -fast -O3 -m64 -o AlphaPhase1.1 I have narrowed down the problem to where I do a matrix multiplication: MarkerNRM=matmul(GenosR,transpose(GenosR)) Is it a stackpace issue? Can you advise? Regards, John Hickey.
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