[Kernel-meetup] Getting optimization report from g++

[Chaitanya Kukde]

Thanks Girish! This helps a lot :)

On Mon, 4 May 2020 at 11:52, Girish Joshi <girish946 at gmail.com> wrote:
>
> Hello Chaitanya,
> you can try following flags.
>
> -fopt-info-vec or -fopt-info-vec-optimized: The compiler will log
> which loops (by line N°) are being vector optimized.
> -fopt-info-vec-missed: Detailed info about loops not being vectorized,
> and a lot of other detailed information.
> -fopt-info-vec-note: Detailed info about all loops and optimizations being done.
> -fopt-info-vec-all: All previous options together.
>
> Girish Joshi
> girishjoshi.io
>
> On Mon, May 4, 2020 at 3:29 AM Chaitanya Kukde
> <chaitanya.kukde at gmail.com> wrote:
> >
> > Hello all,
> >
> > Hope you are okay in this tough time.
> >
> > For a course assignment I had to use Intel C++ Compiler and it had a
> > nifty little option called -qopt-report
> > (https://software.intel.com/en-us/cpp-compiler-developer-guide-and-reference-qopt-report-qopt-report).
> > Is there a similar option in gcc to get compiler optimization reports
> > (specifically pertaining to vector optimizations)? I found one called
> > -fopt-info-all but it was filed under "options for GCC developers" and
> > the report is significantly difficult to read than the Intel one.
> >
> > Was wondering if I was missing something.
> >
> > Cheers!
> > Chaitanya
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