Optimal Optimizations: A Very Preliminary Report

[David Edelsohn]

>>>>> Nathanael Nerode writes:

Nathanael> Hmm.  Which of our arches are out-of-order and which of them are 
Nathanael> in-order?  I believe that -fschedule-insns has been reported to make 
Nathanael> things worse on sh, powerpc, x86, and ia64.  :-/

	Out-of-order is not a characteristic of an architecture; for
instance, PowerPC processors are implemented in both in-order and
out-of-order designs.  -fschedule-insns sometimes helps and sometimes
hurts -- mainly causing problems due to over-speculation.

David