question about gcc assembly

Coline Lelong-Pantel
Tue Jun 27 08:04:00 GMT 2006


I've compiled a short program with two different gcc versions
(3.2.3 and 3.4.3) but it seems that the produced assembly code
isn't the same.

In fact 3.4.3 produce a more important code. For example when
gcc 3.2.3 produces :
movl	$0x405c28f6, -4(%ebp)

gcc 3.4.3 may use:
movl	$0x405c28f6, %eax
movl	%eax, -4(%ebp)

I wonder why it now uses %eax register ? And is there any way
to prevent this, in order to have similar assembly code with
both gcc versions ? Maybe some kind of option ?

Thanks for your answers.


PS Excuse my poor english, but it isn't my native langage.

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