Remove follow_assert_exprs from overflow_comparison.

OK pending tests?

gcc/ChangeLog:

	* tree-vrp.cc (overflow_comparison_p_1): Remove follow_assert_exprs.
	(overflow_comparison_p): Remove use_equiv_p.
	* tree-vrp.h (overflow_comparison_p): Same.
	* vr-values.cc (vrp_evaluate_conditional_warnv_with_ops): Remove
	use_equiv_p argument to overflow_comparison_p.
---
 gcc/tree-vrp.cc  | 40 ++++------------------------------------
 gcc/tree-vrp.h   |  2 +-
 gcc/vr-values.cc |  2 +-
 3 files changed, 6 insertions(+), 38 deletions(-)

On Tue, Nov 22, 2022 at 2:58 PM Aldy Hernandez <aldyh@redhat.com> wrote:
>
> OK pending tests?

OK

> gcc/ChangeLog:
>
>         * tree-vrp.cc (overflow_comparison_p_1): Remove follow_assert_exprs.
>         (overflow_comparison_p): Remove use_equiv_p.
>         * tree-vrp.h (overflow_comparison_p): Same.
>         * vr-values.cc (vrp_evaluate_conditional_warnv_with_ops): Remove
>         use_equiv_p argument to overflow_comparison_p.
> ---
>  gcc/tree-vrp.cc  | 40 ++++------------------------------------
>  gcc/tree-vrp.h   |  2 +-
>  gcc/vr-values.cc |  2 +-
>  3 files changed, 6 insertions(+), 38 deletions(-)
>
> diff --git a/gcc/tree-vrp.cc b/gcc/tree-vrp.cc
> index d29941d0f2d..3846dc1d849 100644
> --- a/gcc/tree-vrp.cc
> +++ b/gcc/tree-vrp.cc
> @@ -679,7 +679,7 @@ range_fold_unary_expr (value_range *vr,
>
>  static bool
>  overflow_comparison_p_1 (enum tree_code code, tree op0, tree op1,
> -                        bool follow_assert_exprs, bool reversed, tree *new_cst)
> +                        bool reversed, tree *new_cst)
>  {
>    /* See if this is a relational operation between two SSA_NAMES with
>       unsigned, overflow wrapping values.  If so, check it more deeply.  */
> @@ -693,19 +693,6 @@ overflow_comparison_p_1 (enum tree_code code, tree op0, tree op1,
>      {
>        gimple *op1_def = SSA_NAME_DEF_STMT (op1);
>
> -      /* If requested, follow any ASSERT_EXPRs backwards for OP1.  */
> -      if (follow_assert_exprs)
> -       {
> -         while (gimple_assign_single_p (op1_def)
> -                && TREE_CODE (gimple_assign_rhs1 (op1_def)) == ASSERT_EXPR)
> -           {
> -             op1 = TREE_OPERAND (gimple_assign_rhs1 (op1_def), 0);
> -             if (TREE_CODE (op1) != SSA_NAME)
> -               break;
> -             op1_def = SSA_NAME_DEF_STMT (op1);
> -           }
> -       }
> -
>        /* Now look at the defining statement of OP1 to see if it adds
>          or subtracts a nonzero constant from another operand.  */
>        if (op1_def
> @@ -716,24 +703,6 @@ overflow_comparison_p_1 (enum tree_code code, tree op0, tree op1,
>         {
>           tree target = gimple_assign_rhs1 (op1_def);
>
> -         /* If requested, follow ASSERT_EXPRs backwards for op0 looking
> -            for one where TARGET appears on the RHS.  */
> -         if (follow_assert_exprs)
> -           {
> -             /* Now see if that "other operand" is op0, following the chain
> -                of ASSERT_EXPRs if necessary.  */
> -             gimple *op0_def = SSA_NAME_DEF_STMT (op0);
> -             while (op0 != target
> -                    && gimple_assign_single_p (op0_def)
> -                    && TREE_CODE (gimple_assign_rhs1 (op0_def)) == ASSERT_EXPR)
> -               {
> -                 op0 = TREE_OPERAND (gimple_assign_rhs1 (op0_def), 0);
> -                 if (TREE_CODE (op0) != SSA_NAME)
> -                   break;
> -                 op0_def = SSA_NAME_DEF_STMT (op0);
> -               }
> -           }
> -
>           /* If we did not find our target SSA_NAME, then this is not
>              an overflow test.  */
>           if (op0 != target)
> @@ -764,13 +733,12 @@ overflow_comparison_p_1 (enum tree_code code, tree op0, tree op1,
>     the alternate range representation is often useful within VRP.  */
>
>  bool
> -overflow_comparison_p (tree_code code, tree name, tree val,
> -                      bool use_equiv_p, tree *new_cst)
> +overflow_comparison_p (tree_code code, tree name, tree val, tree *new_cst)
>  {
> -  if (overflow_comparison_p_1 (code, name, val, use_equiv_p, false, new_cst))
> +  if (overflow_comparison_p_1 (code, name, val, false, new_cst))
>      return true;
>    return overflow_comparison_p_1 (swap_tree_comparison (code), val, name,
> -                                 use_equiv_p, true, new_cst);
> +                                 true, new_cst);
>  }
>
>  /* Handle
> diff --git a/gcc/tree-vrp.h b/gcc/tree-vrp.h
> index 07630b5b1ca..127909604f0 100644
> --- a/gcc/tree-vrp.h
> +++ b/gcc/tree-vrp.h
> @@ -39,7 +39,7 @@ extern enum value_range_kind intersect_range_with_nonzero_bits
>  extern bool find_case_label_range (gswitch *, tree, tree, size_t *, size_t *);
>  extern tree find_case_label_range (gswitch *, const irange *vr);
>  extern bool find_case_label_index (gswitch *, size_t, tree, size_t *);
> -extern bool overflow_comparison_p (tree_code, tree, tree, bool, tree *);
> +extern bool overflow_comparison_p (tree_code, tree, tree, tree *);
>  extern void maybe_set_nonzero_bits (edge, tree);
>
>  #endif /* GCC_TREE_VRP_H */
> diff --git a/gcc/vr-values.cc b/gcc/vr-values.cc
> index 0347c29b216..b0dd30260ae 100644
> --- a/gcc/vr-values.cc
> +++ b/gcc/vr-values.cc
> @@ -837,7 +837,7 @@ simplify_using_ranges::vrp_evaluate_conditional_warnv_with_ops
>       occurs when the chosen argument is zero and does not occur if the
>       chosen argument is not zero.  */
>    tree x;
> -  if (overflow_comparison_p (code, op0, op1, use_equiv_p, &x))
> +  if (overflow_comparison_p (code, op0, op1, &x))
>      {
>        wide_int max = wi::max_value (TYPE_PRECISION (TREE_TYPE (op0)), UNSIGNED);
>        /* B = A - 1; if (A < B) -> B = A - 1; if (A == 0)
> --
> 2.38.1
>