------- Comment #8 from sebastian dot pop at cri dot ensmp dot fr 2006-02-13 08:45 ------- Subject: Re: [4.0/4.1/4.2 Regression] DOM and VRP creating harder to optimize code
This case reminds me the peeled chrec unification that I had to disable on autovect branch (I probably have to run the transformation as a stand alone pass outside the analyzer for not disturbing the user passes). In that case we're looking at a code like loop x = phi (0, a) a = phi (1, a + 1) endloop such that a simple transformation can make "x" a simple iv. This case is also quite important, as it occurs about 300 times during a bootstrap. Now for the current problem, we could run a pass just after loop_init for cleaning all these constructs. As suggested, we would have to build an equivalence relation either like VRP, or on demand. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23821
