gprof and int overflow

gprof and int overflow

[Lewis Hyatt]

Hi Everyone-

I can't get accurate results for functions called more than 2^32-1 times in
gprof; it looks like somewhere the function call counts are limited to 32-bit
integers, even though I am compiling on a 64-bit architecture. Does anyone know
if this is a limitation of gprof or of the gcc implementation of the -pg option?
Is there a workaround? I am using binutils 2.17 and gcc 4.1.2 on Debian. Thanks
very much.

-Lewis

Re: gprof and int overflow

[Ian Lance Taylor]

Lewis Hyatt <lhyatt@gmail.com> writes:

> I can't get accurate results for functions called more than 2^32-1 times in
> gprof; it looks like somewhere the function call counts are limited to 32-bit
> integers, even though I am compiling on a 64-bit architecture. Does anyone know
> if this is a limitation of gprof or of the gcc implementation of the -pg option?
> Is there a workaround? I am using binutils 2.17 and gcc 4.1.2 on Debian. Thanks
> very much.

It's a limitation of the format of the gmon.out file.  The counts are
defined to be 32-bit integers.  I don't know of any workaround.

Ian

Re: gprof and int overflow

[Lewis Hyatt]

Ian Lance Taylor <iant <at> google.com> writes:

> It's a limitation of the format of the gmon.out file.  The counts are
> defined to be 32-bit integers.  I don't know of any workaround.
> 
> Ian
> 
> 

OK thanks... maybe some day there will be a -pg64 option to gcc or something
like that, since these days I can overflow a 32-bit counter on my coffee break
:-).

-Lewis