------- Comment #7 from spop at gcc dot gnu dot org 2007-05-08 21:19 ------- Subject: Re: -ftree-vectorize results in internal compiler error on AMD64
On 5/8/07, Sjodin, Jan <[EMAIL PROTECTED]> wrote: > > Okay, I looked at the code, and the problem is that we have to pass to > > force_gimple_operand an expression that is not a chain of recurrence, > > ie. a real expression that can be used to be decomposed in 3 addr code > > by the gimplifier. > > Thanks! That was the answer I was looking for. Sounds like the > vectorizer is biting off more than it can chew :) Perhaps there is a > check missing for chrecs somewhere. Yes, I also think that the quick fix is to add to the vectorizer the missing checks for simple enough expressions. I went back to look at the testcase, and I saw these nested loops, and we are trying to vectorize the innermost ones. So for avoiding a failed vectorization, and making the vectorizer to produce the right code, we want to generate some code for the base address in the outer loop. Sebastian -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25371
