On 23 Sep 2007 09:54:29 -0700, Ian Lance Taylor <[EMAIL PROTECTED]> wrote: > "Richard Guenther" <[EMAIL PROTECTED]> writes: > > > > We've got a test case with gcc 4.2 for which compilation time goes > > > from nine minutes to 30 seconds when we use that option. I know the > > > code is much better in mainline. Still, I would prefer to keep the > > > option unless we are certain that similar compilation time blowouts > > > can not occur. Lots of code can profit from optimization even with > > > struct aliasing turned off. > > > > Well, ATM the flag doesn't work. And honestly we have enough "kinds" > > of alias bugs - adding another knob to get different wrong-code bugs > > doesn't look too appealing to me ;) > > Well, if the -fno-tree-salias flag now causes wrong-code bugs then I > certainly agree that it should be eliminated.
I didn't say that ;) But I certainly expect salias to expose/hide bugs there because MPT grouping will be changed. At the moment -fno-tree-salias simply ICEs. Richard.
