From 4cc0d3ebaee4b54280ff0466d8e5b351a3b5bacc Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Fri, 12 Aug 2022 12:20:13 +0200 Subject: [PATCH] tree-optimization/106593 - fix ICE with backward threading With the last re-org I failed to make sure to not add SSA names nor supported by ranger into m_imports which then triggers an ICE in range_on_path_entry because range_of_expr returns false. PR tree-optimization/106593 * tree-ssa-threadbackward.cc (back_threader::find_paths): If the imports from the conditional do not satisfy gimple_range_ssa_p don't try to thread anything. --- gcc/tree-ssa-threadbackward.cc | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/gcc/tree-ssa-threadbackward.cc b/gcc/tree-ssa-threadbackward.cc index 546a776bd91..b886027fccf 100644 --- a/gcc/tree-ssa-threadbackward.cc +++ b/gcc/tree-ssa-threadbackward.cc @@ -518,7 +518,11 @@ back_threader::find_paths (basic_block bb, tree name) bitmap_clear (m_imports); ssa_op_iter iter; FOR_EACH_SSA_TREE_OPERAND (name, stmt, iter, SSA_OP_USE) - bitmap_set_bit (m_imports, SSA_NAME_VERSION (name)); + { + if (!gimple_range_ssa_p (name)) + return; + bitmap_set_bit (m_imports, SSA_NAME_VERSION (name)); + } // Interesting is the set of imports we still not have see // the definition of. So while imports only grow, the -- 2.47.3