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b2e9134e8c
Summary: It is possible for LVI to encounter instructions that are not in valid SSA form and reference themselves. One example is the following: %tmp4 = and i1 %tmp4, undef Before this patch LVI would recurse until running out of stack memory and crashed. This patch marks these self-referential instructions as Overdefined and aborts analysis on the instruction. Fixes https://bugs.llvm.org/show_bug.cgi?id=33357 Reviewers: craig.topper, anna, efriedma, dberlin, sebpop, kuhar Reviewed by: dberlin Subscribers: uabelho, spatel, a.elovikov, fhahn, eli.friedman, mzolotukhin, spop, evandro, davide, llvm-commits Differential Revision: https://reviews.llvm.org/D34135 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327432 91177308-0d34-0410-b5e6-96231b3b80d8