topic compiling with -ipo and qopt-report=5 in Intel® Fortran Compiler

compiling with -ipo and qopt-report=5

AThar2 — Tue, 13 Aug 2019 11:37:37 GMT

Hello,

Is there a reason why if I compile with both -ipo qopt-report=5, my optrpt report does not contain much of information. While If i removed -ipo I get the information in the report file as I would expect.

With -ipo, optimization doesn

Steve_Lionel — Tue, 13 Aug 2019 15:56:12 GMT

With -ipo, optimization doesn't occur until the "linking" stage, so there's little to report.

Hello Steve

AThar2 — Tue, 13 Aug 2019 19:37:39 GMT

Hello Steve

that makes sense. What about vector instruction would they be incorporated then? And how to know if a simd loop was vectorized when no report are provided

I'm pretty sure that if you

Steve_Lionel — Tue, 13 Aug 2019 20:01:27 GMT

I'm pretty sure that if you use ifort to link and add -qopt-report that you should get what you want. Until you do the "link" (actually a pre-link phase that then invokes ld), the .o files just have "intermediate code" that is read by the compiler again at the link to do code generation and optimizing.