diff options
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/pr122497-1.c | 13 | ||||
| -rw-r--r-- | gcc/tree-scalar-evolution.cc | 10 |
2 files changed, 18 insertions, 5 deletions
diff --git a/gcc/testsuite/gcc.dg/torture/pr122497-1.c b/gcc/testsuite/gcc.dg/torture/pr122497-1.c new file mode 100644 index 0000000..8b027ca --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr122497-1.c @@ -0,0 +1,13 @@ +/* { dg-do compile } */ +/* PR tree-optimization/122497 */ + +/* This was ICEing during SCCP + trying to simplify a reference back to the phi + which was removed. */ + +char g_2[1][2]; +int g_4, g_5; +void main() { + for (; g_4; g_4 -= 1) + g_5 = g_2[g_4 + 2][g_4]; +} diff --git a/gcc/tree-scalar-evolution.cc b/gcc/tree-scalar-evolution.cc index ecdef75..7907893 100644 --- a/gcc/tree-scalar-evolution.cc +++ b/gcc/tree-scalar-evolution.cc @@ -3949,11 +3949,6 @@ final_value_replacement_loop (class loop *loop) auto loc = gimple_phi_arg_location (phi, exit->dest_idx); remove_phi_node (&psi, false); - /* Propagate constants immediately, but leave an unused initialization - around to avoid invalidating the SCEV cache. */ - if (CONSTANT_CLASS_P (def) && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rslt)) - replace_uses_by (rslt, def); - /* Create the replacement statements. */ gimple_seq stmts; def = force_gimple_operand (def, &stmts, false, NULL_TREE); @@ -3961,6 +3956,11 @@ final_value_replacement_loop (class loop *loop) gimple_set_location (ass, loc); gimple_seq_add_stmt (&stmts, ass); + /* Propagate constants immediately, but leave an unused initialization + around to avoid invalidating the SCEV cache. */ + if (CONSTANT_CLASS_P (def) && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rslt)) + replace_uses_by (rslt, def); + /* If def's type has undefined overflow and there were folded casts, rewrite all stmts added for def into arithmetics with defined overflow behavior. */ |