On 02/03/15 15:29, Jeff Law wrote: > On 03/01/15 16:32, Kugan wrote: >> In linaro-4.9-branch, with the following (reduced) test case, I run into >> a situation where loop_latch_edge is NULL during jump threading. I am >> wondering if this a possible during jump threading or the error lies >> some where else? I can't reproduce it with the trunk. > There's really no way to tell without a lot more information. If you > can't reproduce on the 4.9 branch or the trunk, then you're likely going > to have to do the real digging. > > THe first thing I tend to do with these things is to draw the CFG and > annotate it with all the jump threading paths. Then I look at how the > jump threading paths interact with each other and the loop structure, > then reconcile that with the constraints placed on threading in > tree-ssa-threadupdate.c.
Thanks Jeff. I will do the same. Kugan
