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icc vs g++

Hi,

I was wondering about the following.
How can I write a programme that can be compiled both with g++ and icc,
but when compiled it does this automatically with the optimized math
libraries and complex libraries and so on.

How would I do this?

Regards
Klaas
Oct 26 '06 #1
7 2629
create a makefile ...
Klaas Vantournhout ha scritto:
Hi,

I was wondering about the following.
How can I write a programme that can be compiled both with g++ and icc,
but when compiled it does this automatically with the optimized math
libraries and complex libraries and so on.

How would I do this?

Regards
Klaas
Oct 26 '06 #2
are you going to use the binary on intel-based machines only??
read this and you mind change mind about using the intel compilers...
http://yro.slashdot.org/yro/05/07/12...id=118&tid=123
[ AMD Alleges Intel Compilers Create Slower AMD Code ]

Klaas Vantournhout wrote:
Hi,

I was wondering about the following.
How can I write a programme that can be compiled both with g++ and icc,
but when compiled it does this automatically with the optimized math
libraries and complex libraries and so on.

How would I do this?

Regards
Klaas
Oct 26 '06 #3
Yes I am aware of this, and that is indeed the reason why I need to have
this. On AMD machines, I will compile with g++, while intel-based I
need the icc.

I know I can do this with makefiles, I mean i can set the compiler with
the makefile automatically, but within the code itself I would need to
change headers for optimization.

Like

#include <math>
becomes for intel
#include <mathimf>

are there other libraries that have similar intel libraries that are
optimised? And what about usage of SSE1,2,3 or MMX and more.

StreamKid wrote:
are you going to use the binary on intel-based machines only??
read this and you mind change mind about using the intel compilers...
http://yro.slashdot.org/yro/05/07/12...id=118&tid=123
[ AMD Alleges Intel Compilers Create Slower AMD Code ]

Klaas Vantournhout wrote:
>Hi,

I was wondering about the following.
How can I write a programme that can be compiled both with g++ and icc,
but when compiled it does this automatically with the optimized math
libraries and complex libraries and so on.

How would I do this?

Regards
Klaas
Oct 26 '06 #4
Klaas Vantournhout ha scritto:
Yes I am aware of this, and that is indeed the reason why I need to have
this. On AMD machines, I will compile with g++, while intel-based I
need the icc.

I know I can do this with makefiles, I mean i can set the compiler with
the makefile automatically, but within the code itself I would need to
change headers for optimization.

Like

#include <math>
becomes for intel
#include <mathimf>

are there other libraries that have similar intel libraries that are
optimised? And what about usage of SSE1,2,3 or MMX and more.
with #define .... and #ifdef and #ifndef ?
Oct 26 '06 #5
ehilah wrote:
Klaas Vantournhout ha scritto:
>Yes I am aware of this, and that is indeed the reason why I need to have
this. On AMD machines, I will compile with g++, while intel-based I
need the icc.

I know I can do this with makefiles, I mean i can set the compiler with
the makefile automatically, but within the code itself I would need to
change headers for optimization.

Like

#include <math>
becomes for intel
#include <mathimf>

are there other libraries that have similar intel libraries that are
optimised? And what about usage of SSE1,2,3 or MMX and more.
with #define .... and #ifdef and #ifndef ?
Indeed, #if __INTEL_COMPILER would do the trick, there that is true.

But I was wondering what I need to change in the code itself. Where do
I need to make the changes.
Oct 26 '06 #6
Klaas Vantournhout <no************@spam.comwrote:
ehilah wrote:
>Klaas Vantournhout ha scritto:
>>Yes I am aware of this, and that is indeed the reason why I need to have
this. On AMD machines, I will compile with g++, while intel-based I
need the icc.

I know I can do this with makefiles, I mean i can set the compiler with
the makefile automatically, but within the code itself I would need to
change headers for optimization.

Like

#include <math>
becomes for intel
#include <mathimf>

are there other libraries that have similar intel libraries that are
optimised? And what about usage of SSE1,2,3 or MMX and more.
with #define .... and #ifdef and #ifndef ?

Indeed, #if __INTEL_COMPILER would do the trick, there that is true.

But I was wondering what I need to change in the code itself. Where do
I need to make the changes.
Maybe you could create another header, like:

my_math.h
#ifdef __INTEL_COMPILER
#include <mathimf>
#else
#include <math// probably should be <math.hor <cmath>
#endif

Then in your actual code,
#include "my_math.h"

--
Marcus Kwok
Replace 'invalid' with 'net' to reply
Oct 26 '06 #7

Klaas Vantournhout wrote:
Yes I am aware of this, and that is indeed the reason why I need to have
this. On AMD machines, I will compile with g++, while intel-based I
need the icc.
Have you tried yet if icc is really slower for AMD than g++ is? This
should be the first thing to evaluate.

Oct 26 '06 #8

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