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Newsgroups: comp.lang.ada
Date: Mon, 25 Jul 2016 09:45:18 -0700 (PDT)
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Subject: Re: Profiling Ada binaries
From: rieachus@comcast.net
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Xref: news.eternal-september.org comp.lang.ada:31159
Date: 2016-07-25T09:45:18-07:00
List-Id: <comp.lang.ada>

On Monday, July 25, 2016 at 3:01:07 AM UTC-4, Markus Sch=C3=B6pflin wrote:
I am trying to profile code generated by Gnat using Gprof. For this I add -=
pg=20
to the compilation and link switches, turn down optimization to -O1 and=20
disable inlining of functions only called once=20
(-fno-inline-functions-called-once).

Gee. I would never think to compile the math libraries with -O1.  Seriously=
, the math libraries are written with ease of understanding in mind.  You m=
ay have thousands of calls in the implementation of one function, and due t=
o the packages being generic, every one of those calls will do an elaborati=
on check.  How can that be efficient?  I believe GNAT has non-generic versi=
ons for Short_Float, Float, and Long_Float which use the hardware built-ins=
.  But I doubt you would get that automatically with -O1.

Try compiling everything with -O3 (or whatever you use) then recompile only=
 the unit you want the tracing for with -O1 and -fno-inline-functions-calle=
d-once.