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Diffstat (limited to 'gcc/tree-scalar-evolution.c')
| -rw-r--r-- | gcc/tree-scalar-evolution.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/tree-scalar-evolution.c b/gcc/tree-scalar-evolution.c index 087ba79..3ebc54e 100644 --- a/gcc/tree-scalar-evolution.c +++ b/gcc/tree-scalar-evolution.c @@ -1642,6 +1642,23 @@ interpret_loop_phi (struct loop *loop, gimple loop_phi_node) init_cond = analyze_initial_condition (loop_phi_node); res = analyze_evolution_in_loop (loop_phi_node, init_cond); + /* Verify we maintained the correct initial condition throughout + possible conversions in the SSA chain. */ + if (res != chrec_dont_know) + { + tree new_init = res; + if (CONVERT_EXPR_P (res) + && TREE_CODE (TREE_OPERAND (res, 0)) == POLYNOMIAL_CHREC) + new_init = fold_convert (TREE_TYPE (res), + CHREC_LEFT (TREE_OPERAND (res, 0))); + else if (TREE_CODE (res) == POLYNOMIAL_CHREC) + new_init = CHREC_LEFT (res); + STRIP_USELESS_TYPE_CONVERSION (new_init); + gcc_assert (TREE_CODE (new_init) != POLYNOMIAL_CHREC); + if (!operand_equal_p (init_cond, new_init, 0)) + return chrec_dont_know; + } + return res; } |