Re: [LAD] How do you improve optimization for integer calculations?

In Sun, 7 Apr 2019 22:27:34 +0200
Maarten de Boer <mdb.list@resorama.com> wrote:

> > Looks like you propose to use intel-specific intrinsics. I already
> > looked gcc docs in hope to find something similar, but only found
> > vectorization section, from C extensions. Hoped to see something
> > probablt gcc-specific, but not intel-spec.
>
> I am not sure if I understand what you mean, but Intel’s SSE
> intrinsics are well supported by gcc.
>
> This might be a good read:
> https://www.it.uu.se/edu/course/homepage/hpb/vt12/lab4.pdf
> <https://www.it.uu.se/edu/course/homepage/hpb/vt12/lab4.pdf>
>
> > […] Probably -O3 shuffled code too hard to
> > correctly represent in debugger even with -g :/
>
> Instead of using the debugger to look at the assembly, you could use
> objdump -S -l on the object file
>
> -S, --source Intermix source code with disassembly
> -l, --line-numbers Include line numbers and filenames in output
>
> Good luck.
>
> Maarten
>
>
>
>
>
>

Thanks!
I tried gcc option -save-temps just before objdump, but second with
give options seems to be way more useful :).
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Received on Mon Apr 8 12:15:01 2019