On Thursday 19 February 2009 19:01, Vincent Trouilliez wrote:
> I made a few trials. It appears that up to and including 3 nop
> statements, GCC leaves them alone. But if I put 4 of them, it removes
> them all !
Are you absolutely sure they are really left out? I assume they are
just not shown in the assembly file. Four or more nops are replaced
by ellipses, but are present allright. Have a close look at the addresses.
Otherwise you could use
__asm__ volatile(
"nop \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t");
in which gcc cannot start to optimize.
Ruud
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