both integers. */
gcc_assert (POINTER_TYPE_P (TREE_TYPE (val1))
== POINTER_TYPE_P (TREE_TYPE (val2)));
+ /* Convert the two values into the same type. This is needed because
+ sizetype causes sign extension even for unsigned types. */
+ val2 = fold_convert (TREE_TYPE (val1), val2);
+ STRIP_USELESS_TYPE_CONVERSION (val2);
if ((TREE_CODE (val1) == SSA_NAME
|| TREE_CODE (val1) == PLUS_EXPR
if (!TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (val1)))
return -2;
- if (strict_overflow_p != NULL)
+ if (strict_overflow_p != NULL
+ && (code1 == SSA_NAME || !TREE_NO_WARNING (val1))
+ && (code2 == SSA_NAME || !TREE_NO_WARNING (val2)))
*strict_overflow_p = true;
if (code1 == SSA_NAME)
{
tree one = build_int_cst (type, 1);
max = fold_build2 (MINUS_EXPR, type, max, one);
+ if (EXPR_P (max))
+ TREE_NO_WARNING (max) = 1;
}
set_value_range (vr_p, VR_RANGE, min, max, vr_p->equiv);
{
tree one = build_int_cst (type, 1);
min = fold_build2 (PLUS_EXPR, type, min, one);
+ if (EXPR_P (min))
+ TREE_NO_WARNING (min) = 1;
}
set_value_range (vr_p, VR_RANGE, min, max, vr_p->equiv);
}
min = positive_overflow_infinity (TREE_TYPE (var_vr->min));
}
- else
+ else if (!POINTER_TYPE_P (TREE_TYPE (var_vr->min)))
min = fold_build2 (PLUS_EXPR, TREE_TYPE (var_vr->min),
anti_max,
build_int_cst (TREE_TYPE (var_vr->min), 1));
+ else
+ min = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (var_vr->min),
+ anti_max, size_int (1));
max = real_max;
set_value_range (vr_p, VR_RANGE, min, max, vr_p->equiv);
}
}
max = negative_overflow_infinity (TREE_TYPE (var_vr->min));
}
- else
+ else if (!POINTER_TYPE_P (TREE_TYPE (var_vr->min)))
max = fold_build2 (MINUS_EXPR, TREE_TYPE (var_vr->min),
anti_min,
build_int_cst (TREE_TYPE (var_vr->min), 1));
+ else
+ max = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (var_vr->min),
+ anti_min,
+ size_int (-1));
min = real_min;
set_value_range (vr_p, VR_RANGE, min, max, vr_p->equiv);
}
meaningful way. Handle only arithmetic operations. */
if (code != PLUS_EXPR
&& code != MINUS_EXPR
+ && code != POINTER_PLUS_EXPR
&& code != MULT_EXPR
&& code != TRUNC_DIV_EXPR
&& code != FLOOR_DIV_EXPR
|| POINTER_TYPE_P (TREE_TYPE (op0))
|| POINTER_TYPE_P (TREE_TYPE (op1)))
{
- /* For pointer types, we are really only interested in asserting
- whether the expression evaluates to non-NULL. FIXME, we used
- to gcc_assert (code == PLUS_EXPR || code == MINUS_EXPR), but
- ivopts is generating expressions with pointer multiplication
- in them. */
- if (code == PLUS_EXPR)
+ if (code == MIN_EXPR || code == MAX_EXPR)
{
- if (range_is_nonnull (&vr0) || range_is_nonnull (&vr1))
+ /* For MIN/MAX expressions with pointers, we only care about
+ nullness, if both are non null, then the result is nonnull.
+ If both are null, then the result is null. Otherwise they
+ are varying. */
+ if (range_is_nonnull (&vr0) && range_is_nonnull (&vr1))
set_value_range_to_nonnull (vr, TREE_TYPE (expr));
else if (range_is_null (&vr0) && range_is_null (&vr1))
set_value_range_to_null (vr, TREE_TYPE (expr));
else
set_value_range_to_varying (vr);
+
+ return;
}
+ gcc_assert (code == POINTER_PLUS_EXPR);
+ /* For pointer types, we are really only interested in asserting
+ whether the expression evaluates to non-NULL. */
+ if (range_is_nonnull (&vr0) || range_is_nonnull (&vr1))
+ set_value_range_to_nonnull (vr, TREE_TYPE (expr));
+ else if (range_is_null (&vr0) && range_is_null (&vr1))
+ set_value_range_to_null (vr, TREE_TYPE (expr));
else
- {
- /* Subtracting from a pointer, may yield 0, so just drop the
- resulting range to varying. */
- set_value_range_to_varying (vr);
- }
+ set_value_range_to_varying (vr);
return;
}
&& is_gimple_val (new_max)
&& tree_int_cst_equal (new_min, orig_min)
&& tree_int_cst_equal (new_max, orig_max)
+ && (!is_overflow_infinity (new_min)
+ || !is_overflow_infinity (new_max))
&& (cmp = compare_values (new_min, new_max)) <= 0
&& cmp >= -1)
{
return;
chrec = instantiate_parameters (loop, analyze_scalar_evolution (loop, var));
+
+ /* Like in PR19590, scev can return a constant function. */
+ if (is_gimple_min_invariant (chrec))
+ {
+ set_value_range (vr, VR_RANGE, chrec, chrec, vr->equiv);
+ return;
+ }
+
if (TREE_CODE (chrec) != POLYNOMIAL_CHREC)
return;
if (compare_values (min, max) == 1)
return;
}
+
+ /* According to the loop information, the variable does not
+ overflow. If we think it does, probably because of an
+ overflow due to arithmetic on a different INF value,
+ reset now. */
+ if (is_negative_overflow_infinity (min))
+ min = tmin;
}
else
{
if (compare_values (min, max) == 1)
return;
}
+
+ if (is_positive_overflow_infinity (max))
+ max = tmax;
}
set_value_range (vr, VR_RANGE, min, max, vr->equiv);
}
}
+/* Return true if VAR may overflow at STMT. This checks any available
+ loop information to see if we can determine that VAR does not
+ overflow. */
+
+static bool
+vrp_var_may_overflow (tree var, tree stmt)
+{
+ struct loop *l;
+ tree chrec, init, step;
+
+ if (current_loops == NULL)
+ return true;
+
+ l = loop_containing_stmt (stmt);
+ if (l == NULL)
+ return true;
+
+ chrec = instantiate_parameters (l, analyze_scalar_evolution (l, var));
+ if (TREE_CODE (chrec) != POLYNOMIAL_CHREC)
+ return true;
+
+ init = initial_condition_in_loop_num (chrec, l->num);
+ step = evolution_part_in_loop_num (chrec, l->num);
+
+ if (step == NULL_TREE
+ || !is_gimple_min_invariant (step)
+ || !valid_value_p (init))
+ return true;
+
+ /* If we get here, we know something useful about VAR based on the
+ loop information. If it wraps, it may overflow. */
+
+ if (scev_probably_wraps_p (init, step, stmt, get_chrec_loop (chrec),
+ true))
+ return true;
+
+ if (dump_file && (dump_flags & TDF_DETAILS) != 0)
+ {
+ print_generic_expr (dump_file, var, 0);
+ fprintf (dump_file, ": loop information indicates does not overflow\n");
+ }
+
+ return false;
+}
+
/* Given two numeric value ranges VR0, VR1 and a comparison code COMP:
equiv_vr = get_vr_for_comparison (SSA_NAME_VERSION (var));
sop = false;
retval = compare_range_with_value (comp, &equiv_vr, val, &sop);
- if (sop)
- used_strict_overflow = 1;
+ if (retval)
+ used_strict_overflow = sop ? 1 : 0;
/* If the equiv set is empty we have done all work we need to do. */
if (e == NULL)
if (vrp_val_is_max (vr_result.max))
goto varying;
- if (!needs_overflow_infinity (TREE_TYPE (vr_result.min)))
+ if (!needs_overflow_infinity (TREE_TYPE (vr_result.min))
+ || !vrp_var_may_overflow (lhs, phi))
vr_result.min = TYPE_MIN_VALUE (TREE_TYPE (vr_result.min));
else if (supports_overflow_infinity (TREE_TYPE (vr_result.min)))
vr_result.min =
if (vrp_val_is_min (vr_result.min))
goto varying;
- if (!needs_overflow_infinity (TREE_TYPE (vr_result.max)))
+ if (!needs_overflow_infinity (TREE_TYPE (vr_result.max))
+ || !vrp_var_may_overflow (lhs, phi))
vr_result.max = TYPE_MAX_VALUE (TREE_TYPE (vr_result.max));
else if (supports_overflow_infinity (TREE_TYPE (vr_result.max)))
vr_result.max =
{
tree one = build_int_cst (TREE_TYPE (op0), 1);
max = fold_build2 (MINUS_EXPR, TREE_TYPE (op0), max, one);
+ if (EXPR_P (max))
+ TREE_NO_WARNING (max) = 1;
}
}
else if (cond_code == GE_EXPR || cond_code == GT_EXPR)
{
tree one = build_int_cst (TREE_TYPE (op0), 1);
min = fold_build2 (PLUS_EXPR, TREE_TYPE (op0), min, one);
+ if (EXPR_P (min))
+ TREE_NO_WARNING (min) = 1;
}
}
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