On Mon, Nov 05, 2007 at 10:15:55AM -0800, Ian Lance Taylor wrote: > skaller <[EMAIL PROTECTED]> writes: > > Ah, I see. So turning [strict aliasing] off isn't really all that bad > > for optimisation. > > It depends on the processor. For an in-order processor with a deep > pipeline (e.g., Itanium, but there are others), the ability to reorder > loads and stores is very important to permit scheduling flexibility. > Strict aliasing reportedly makes a difference for x86, but I don't > think it makes a huge difference.
It also depends on the input: for scientific codes that process both integer and real data, strict aliasing could make a large difference on any processor.
