From: "Tauno Voipio" <tauno DOT voipio AT iki DOT fi DOT SPAMBAIT_REMOVE DOT invalid>
Newsgroups: comp.os.msdos.djgpp,gnu.gcc.help,gnu.utils.help
References: <b54db9$252aq3$1 AT ID-79865 DOT news DOT dfncis DOT de>
Subject: Re: gcc -O3 & gprof
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Date: Mon, 17 Mar 2003 12:31:42 GMT
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"Alex Vinokur" <alexvn AT bigfoot DOT com> wrote in message
news:b54db9$252aq3$1 AT ID-79865 DOT news DOT dfncis DOT de...
> =====================
> Windows 2000
> DJGPP 2.03
> GNU gcc version 3.2.1
> GNU gprof 2.13
> =====================
>
>
> Here is a simple program that has been profiled with using gprof.
> We can see that if the program is compiled with option -O3
>  then gprof's output doesn't contained called functions foo1() and foo2().
>
> Any explanation ?
>
>
> ========= C code : BEGIN =========
> /* File main.c */
>
> int foo1 (int argc) { return argc; }
> int foo2 (int argc) { return argc; }

The optimisation -O3 inlines simple functions (like yours here). There are
no calls to trace.

HTH

Tauno Voipio
tauno voipio @ iki fi