PowerPC 64 x 32 bits performance

[Alan Modra]

On Fri, Mar 04, 2005 at 04:59:25PM -0600, Edmar Wienskoski wrote:
> and notice a considerable number of load instructions in the 64 bits one.
> 
> Does anyone have an insight on why this is happening ?

These are most likey 64-bit address constant loads.  On ppc32, a 32-bit
address constant can be calculated in at most 2 instructions.  A 64-bit
address takes up to 5 instructions to calculate in-line, or a TOC memory
load.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre