topic The instruction set used is in Intel® Fortran Compiler

SIMD parallelism

maria — Sat, 24 Feb 2018 01:15:05 GMT

I would like to include SIMD parallelism in OpenMP loop. The syntax of the loop simd construct is simple as

!$omp do simd

do loops

!$omp end do simd

The question is that after the code is compiled with above construct, will the executable run on a non-simd processor? I mean if I compile the code with the above and distribute the executable file to all users with different processors, will some of them with a non-simd processor encounter any problem? Thank you, Maria

Intel Fortran isn't supported

Steve_Lionel — Sat, 24 Feb 2018 01:36:08 GMT

Intel Fortran isn't supported on any non-SIMD processors. That would have to be pre-Pentium 4. DO SIMD distributes the loop across threads and uses vector instructions where useful.

The instruction set used is

TimP — Sat, 24 Feb 2018 03:10:26 GMT

The instruction set used is limited according to what you specified in the command line, even in the case where it makes simd inefficient.