[Bug tree-optimization/82128] New: [8 Regression] ICE on valid code

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82128

            Bug ID: 82128
           Summary: [8 Regression] ICE on valid code
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---

After Richi's commit r251650 we ICE on:

$ g++ /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/torture/pr65626.C -O3
-fno-tree-forwprop
during GIMPLE pass: fre
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/torture/pr65626.C: In member
function ‘void B::m_fn3(const A&, const int&, const C&, int&) const’:
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/torture/pr65626.C:19:1:
internal compiler error: in VN_INFO, at tree-ssa-sccvn.c:387
 }
 ^
0xf6f52b VN_INFO(tree_node*)
        ../../gcc/tree-ssa-sccvn.c:387
0xf47c35 eliminate_avail
        ../../gcc/tree-ssa-pre.c:4104
0xf4a0b7 eliminate_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/tree-ssa-pre.c:4604
0x14e0c7a dom_walker::walk(basic_block_def*)
        ../../gcc/domwalk.c:291
0xf4923b eliminate
        ../../gcc/tree-ssa-pre.c:4831
0xf4930e execute
        ../../gcc/tree-ssa-pre.c:5277