https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116142
--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> --- On Thu, 1 Aug 2024, xry111 at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116142 > > --- Comment #9 from Xi Ruoyao <xry111 at gcc dot gnu.org> --- > In the following call stack: > > #0 single_imm_use (var=0x7ffff564a3a8, use_p=0x7fffffffc9d8, > stmt=0x7fffffffc9e0) at ../../gcc/gcc/ssa-iterators.h:427 > #1 0x0000000001aabcde in vec_info::lookup_single_use (this=0x33a1b80, > lhs=0x7ffff564a3a8) at ../../gcc/gcc/tree-vectorizer.cc:581 > #2 0x0000000001a1a40a in supportable_widening_operation (vinfo=0x33a1b80, > code=..., stmt_info=0x3482b50, vectype_out=0x7ffff595a1f8, > vectype_in=0x7ffff595a000, code1=0x7fffffffcb90, code2=0x7fffffffcb94, > multi_step_cvt=0x7fffffffcba0, interm_types=0x7fffffffcc48) > at ../../gcc/gcc/tree-vect-stmts.cc:14196 > #3 0x00000000019f7c2d in vectorizable_conversion (vinfo=0x33a1b80, > stmt_info=0x3482b50, gsi=0x0, vec_stmt=0x0, slp_node=0x33b4cc8, > cost_vec=0x7fffffffd190) at ../../gcc/gcc/tree-vect-stmts.cc:5438 > #4 0x0000000001a16ecc in vect_analyze_stmt (vinfo=0x33a1b80, > stmt_info=0x3482b50, need_to_vectorize=0x7fffffffcf73, node=0x33b4cc8, > node_instance=0x32fb6e0, cost_vec=0x7fffffffd190) > at ../../gcc/gcc/tree-vect-stmts.cc:13291 > > "ptr == ptr->next" is satisfied (the comment says it means "there aren't any > uses whatsoever" but I don't really understand it: I knows almost nothing > about > tree vectorization) and single_imm_use directly returns false. So likely tree lhs = gimple_assign_lhs (stmt_info->stmt); stmt_vec_info use_stmt_info = loop_info->lookup_single_use (lhs); if (use_stmt_info needs to be tree lhs = gimple_assign_lhs (vect_orig_stmt (stmt_info)->stmt); stmt_vec_info use_stmt_info = loop_info->lookup_single_use (lhs);
