Product Version: Intel(R) Visual Fortran Compiler XE 15.0 or a later version
The vectorization report generated when using Visual Fortran Compiler's optimization options ( /O2 /Qopt-report:2 ) states that compile time constraints prevent optimization.
An example below will generate the following remark in optimization report:
subroutine foo(a, n) implicit none integer, intent(in) :: n double precision, intent(inout) :: a(n) integer :: bar integer :: i i=0 100 CONTINUE a(i)=0 i=i+1 if (i .lt. bar()) goto 100 end subroutine foo
Report from: Loop nest, Vector & Auto-parallelization optimizations [loop, vec, par]
remark #15532: loop was not vectorized: compile time constraints prevent loop optimization. Consider using -O3.
GOTO statements prevent vectorization since loop iteration count cannot be computed.
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Notice revision #20110804