Hello, > I am upgrading a port from 3.4.5 to 4.1.x .In course of this I see some
> regressions in terms of performance in memcpy . I have narrowed down the test > case to the function below. > > ivopts generates ivtmps for each of the address calculations as shown in the > attached log instead of coalescing them into accesses off a single base . > > I have constant offset based indexed addressing available. 3.4.x works just > fine > and transforms these into accesses off a single base. > > >From the little I understand of the way ivopts works- I assume this has to do > with costs from my backend. I tweaked TARGET_ADDRESS_COST to return 0 always > as > well as specifically for POST_INC, POST_DEC and friends , but this did not > help . > > Any suggestions would be great ! Thanks for your time . this is a bug in ivopts, the costs have nothing to do with it. It appears to be fixed in 4.2 (I cannot reproduce it with your example there). Zdenek
