[Bug tree-optimization/66280] [4.8/4.9/5/6 Regression] ICE: in vect_get_vec_def_for_operand, at tree-vect-stmts.c:1472

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66280

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
repro.ii: In function ‘void fn1()’:
repro.ii:16:1: error: definition in block 7 follows the use
 fn1 ()
 ^
for SSA_NAME: vect_patt_56.19_117 in statement:
vect_inter_high_132 = VEC_PERM_EXPR <vect_patt_56.19_117, vect_patt_56.19_117,
{ 0, 4, 1, 5 }>;
repro.ii:16:1: internal compiler error: verify_ssa failed
0xe77f79 verify_ssa(bool, bool)
        ../../gcc/gcc/tree-ssa.c:1068
0xbcfee5 execute_function_todo
        ../../gcc/gcc/passes.c:1953
0xbd06d3 execute_todo
        ../../gcc/gcc/passes.c:2003
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