Why is the performance of 32bit program worse than 64bit program running on the same 64bit system, They are compiled from same source. Which gcc option can fix it?

[Jonathan Wakely]

On 25 March 2014 10:10, David Brown wrote:
>
> One thing I notice from your post is that you are compiling without
> enabling optimisation, which cripples the compiler's performance.

Performance comparisons on unoptimised code are worthless.