I've rebased this patch to be independent of the others, to perhaps
parallelize the review process.
As mentioned before, this patch enforces canonicalization of ranges upon
creation. This makes it easier to compare results of range
implementations and avoids multiple representations for the same range
(and the special casing the is usually needed to handle these). The
patch also enforces no equivalences for VARYING and UNDEFINED, and
guarantees that there is only one way to represent varying, with
VR_VARYING, not with [MIN,MAX], etc.
I have also adjusted ranges_from_anti_range, vrp_val_max, and
vrp_val_min to work with pointers. I have seen multiple uses of pointer
ranges containing constants in VRP, for magic pointer values and such in
libgcc, and other code bases. Even though VRP mostly generalizes
pointers to null / non-null, range-ops gets finer results because it
doesn't "forget" that a pointer could have been 0 or 0xdeadbeef, or
whatever. These changes are not strictly necessary (we could dumb down
range-ops), but I see no reason to do so.
No ChangeLog entries yet, as we usually go through various interations
before we agree on anything.
Tested on x86-64 Linux with all languages.
Aldy
commit ce0b4c5a66cf17a3f4f91793bcf68db854d8d2b8
Author: Aldy Hernandez <al...@redhat.com>
Date: Mon Jul 15 18:09:27 2019 +0200
Enforce canonicalization in value_range.
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c
index 594ee9adc17..de2f39d8487 100644
--- a/gcc/tree-vrp.c
+++ b/gcc/tree-vrp.c
@@ -69,23 +69,20 @@ along with GCC; see the file COPYING3. If not see
#include "builtins.h"
#include "wide-int-range.h"
+static bool
+ranges_from_anti_range (const value_range_base *ar,
+ value_range_base *vr0, value_range_base *vr1,
+ bool handle_pointers = false);
+
/* Set of SSA names found live during the RPO traversal of the function
for still active basic-blocks. */
static sbitmap *live;
-void
-value_range_base::set (enum value_range_kind kind, tree min, tree max)
-{
- m_kind = kind;
- m_min = min;
- m_max = max;
- if (flag_checking)
- check ();
-}
-
void
value_range::set_equiv (bitmap equiv)
{
+ if (undefined_p () || varying_p ())
+ equiv = NULL;
/* Since updating the equivalence set involves deep copying the
bitmaps, only do it if absolutely necessary.
@@ -261,7 +258,8 @@ value_range_base::constant_p () const
void
value_range_base::set_undefined ()
{
- set (VR_UNDEFINED, NULL, NULL);
+ m_kind = VR_UNDEFINED;
+ m_min = m_max = NULL;
}
void
@@ -273,7 +271,8 @@ value_range::set_undefined ()
void
value_range_base::set_varying ()
{
- set (VR_VARYING, NULL, NULL);
+ m_kind = VR_VARYING;
+ m_min = m_max = NULL;
}
void
@@ -324,6 +323,24 @@ value_range::equiv_add (const_tree var,
bool
value_range_base::singleton_p (tree *result) const
{
+ if (m_kind == VR_ANTI_RANGE)
+ {
+ if (nonzero_p ())
+ {
+ if (TYPE_PRECISION (type ()) == 1)
+ {
+ if (result)
+ *result = m_max;
+ return true;
+ }
+ return false;
+ }
+
+ value_range_base vr0, vr1;
+ return (ranges_from_anti_range (this, &vr0, &vr1, true)
+ && vr1.undefined_p ()
+ && vr0.singleton_p (result));
+ }
if (m_kind == VR_RANGE
&& vrp_operand_equal_p (min (), max ())
&& is_gimple_min_invariant (min ()))
@@ -499,23 +516,28 @@ static assert_locus **asserts_for;
/* Return the maximum value for TYPE. */
tree
-vrp_val_max (const_tree type)
+vrp_val_max (const_tree type, bool handle_pointers)
{
- if (!INTEGRAL_TYPE_P (type))
- return NULL_TREE;
-
- return TYPE_MAX_VALUE (type);
+ if (INTEGRAL_TYPE_P (type))
+ return TYPE_MAX_VALUE (type);
+ if (POINTER_TYPE_P (type) && handle_pointers)
+ {
+ wide_int max = wi::max_value (TYPE_PRECISION (type), TYPE_SIGN (type));
+ return wide_int_to_tree (const_cast<tree> (type), max);
+ }
+ return NULL_TREE;
}
/* Return the minimum value for TYPE. */
tree
-vrp_val_min (const_tree type)
+vrp_val_min (const_tree type, bool handle_pointers)
{
- if (!INTEGRAL_TYPE_P (type))
- return NULL_TREE;
-
- return TYPE_MIN_VALUE (type);
+ if (INTEGRAL_TYPE_P (type))
+ return TYPE_MIN_VALUE (type);
+ if (POINTER_TYPE_P (type) && handle_pointers)
+ return build_zero_cst (const_cast<tree> (type));
+ return NULL_TREE;
}
/* Return whether VAL is equal to the maximum value of its type.
@@ -626,8 +648,7 @@ intersect_range_with_nonzero_bits (enum value_range_kind vr_type,
extract ranges from var + CST op limit. */
void
-value_range_base::set_and_canonicalize (enum value_range_kind kind,
- tree min, tree max)
+value_range_base::set (enum value_range_kind kind, tree min, tree max)
{
/* Use the canonical setters for VR_UNDEFINED and VR_VARYING. */
if (kind == VR_UNDEFINED)
@@ -645,7 +666,9 @@ value_range_base::set_and_canonicalize (enum value_range_kind kind,
if (TREE_CODE (min) != INTEGER_CST
|| TREE_CODE (max) != INTEGER_CST)
{
- set (kind, min, max);
+ m_kind = kind;
+ m_min = min;
+ m_max = max;
return;
}
@@ -681,12 +704,13 @@ value_range_base::set_and_canonicalize (enum value_range_kind kind,
kind = kind == VR_RANGE ? VR_ANTI_RANGE : VR_RANGE;
}
+ tree type = TREE_TYPE (min);
+
/* Anti-ranges that can be represented as ranges should be so. */
if (kind == VR_ANTI_RANGE)
{
/* For -fstrict-enums we may receive out-of-range ranges so consider
values < -INF and values > INF as -INF/INF as well. */
- tree type = TREE_TYPE (min);
bool is_min = (INTEGRAL_TYPE_P (type)
&& tree_int_cst_compare (min, TYPE_MIN_VALUE (type)) <= 0);
bool is_max = (INTEGRAL_TYPE_P (type)
@@ -729,22 +753,37 @@ value_range_base::set_and_canonicalize (enum value_range_kind kind,
}
}
+ /* Normalize [MIN, MAX] into VARYING and ~[MIN, MAX] into UNDEFINED.
+
+ Avoid using TYPE_{MIN,MAX}_VALUE because -fstrict-enums can
+ restrict those to a subset of what actually fits in the type.
+ Instead use the extremes of the type precision which will allow
+ compare_range_with_value() to check if a value is inside a range,
+ whereas if we used TYPE_*_VAL, said function would just punt
+ upon seeing a VARYING. */
+ unsigned prec = TYPE_PRECISION (type);
+ signop sign = TYPE_SIGN (type);
+ if (wi::eq_p (wi::to_wide (min), wi::min_value (prec, sign))
+ && wi::eq_p (wi::to_wide (max), wi::max_value (prec, sign)))
+ {
+ if (kind == VR_RANGE)
+ set_varying ();
+ else if (kind == VR_ANTI_RANGE)
+ set_undefined ();
+ else
+ gcc_unreachable ();
+ return;
+ }
+
/* Do not drop [-INF(OVF), +INF(OVF)] to varying. (OVF) has to be sticky
to make sure VRP iteration terminates, otherwise we can get into
oscillations. */
- set (kind, min, max);
-}
-
-void
-value_range::set_and_canonicalize (enum value_range_kind kind,
- tree min, tree max, bitmap equiv)
-{
- value_range_base::set_and_canonicalize (kind, min, max);
- if (this->kind () == VR_RANGE || this->kind () == VR_ANTI_RANGE)
- set_equiv (equiv);
- else
- equiv_clear ();
+ m_kind = kind;
+ m_min = min;
+ m_max = max;
+ if (flag_checking)
+ check ();
}
void
@@ -1174,7 +1213,8 @@ vrp_set_zero_nonzero_bits (const tree expr_type,
static bool
ranges_from_anti_range (const value_range_base *ar,
- value_range_base *vr0, value_range_base *vr1)
+ value_range_base *vr0, value_range_base *vr1,
+ bool handle_pointers)
{
tree type = ar->type ();
@@ -1187,18 +1227,18 @@ ranges_from_anti_range (const value_range_base *ar,
if (ar->kind () != VR_ANTI_RANGE
|| TREE_CODE (ar->min ()) != INTEGER_CST
|| TREE_CODE (ar->max ()) != INTEGER_CST
- || !vrp_val_min (type)
- || !vrp_val_max (type))
+ || !vrp_val_min (type, handle_pointers)
+ || !vrp_val_max (type, handle_pointers))
return false;
- if (tree_int_cst_lt (vrp_val_min (type), ar->min ()))
+ if (tree_int_cst_lt (vrp_val_min (type, handle_pointers), ar->min ()))
vr0->set (VR_RANGE,
- vrp_val_min (type),
+ vrp_val_min (type, handle_pointers),
wide_int_to_tree (type, wi::to_wide (ar->min ()) - 1));
- if (tree_int_cst_lt (ar->max (), vrp_val_max (type)))
+ if (tree_int_cst_lt (ar->max (), vrp_val_max (type, handle_pointers)))
vr1->set (VR_RANGE,
wide_int_to_tree (type, wi::to_wide (ar->max ()) + 1),
- vrp_val_max (type));
+ vrp_val_max (type, handle_pointers));
if (vr0->undefined_p ())
{
*vr0 = *vr1;
@@ -1209,21 +1249,20 @@ ranges_from_anti_range (const value_range_base *ar,
}
/* Extract the components of a value range into a pair of wide ints in
- [WMIN, WMAX].
-
- If the value range is anything but a VR_*RANGE of constants, the
- resulting wide ints are set to [-MIN, +MAX] for the type. */
+ [WMIN, WMAX], after having normalized any symbolics from the input. */
static void inline
-extract_range_into_wide_ints (const value_range_base *vr,
- signop sign, unsigned prec,
- wide_int &wmin, wide_int &wmax)
+extract_range_into_wide_ints (const value_range_base *vr_,
+ tree type, wide_int &wmin, wide_int &wmax)
{
- gcc_assert (vr->kind () != VR_ANTI_RANGE || vr->symbolic_p ());
- if (range_int_cst_p (vr))
+ signop sign = TYPE_SIGN (type);
+ unsigned int prec = TYPE_PRECISION (type);
+ gcc_assert (vr_->kind () != VR_ANTI_RANGE || vr_->symbolic_p ());
+ value_range vr = vr_->normalize_symbolics ();
+ if (range_int_cst_p (&vr))
{
- wmin = wi::to_wide (vr->min ());
- wmax = wi::to_wide (vr->max ());
+ wmin = wi::to_wide (vr.min ());
+ wmax = wi::to_wide (vr.max ());
}
else
{
@@ -1240,7 +1279,8 @@ static void
extract_range_from_multiplicative_op (value_range_base *vr,
enum tree_code code,
const value_range_base *vr0,
- const value_range_base *vr1)
+ const value_range_base *vr1,
+ tree type)
{
gcc_assert (code == MULT_EXPR
|| code == TRUNC_DIV_EXPR
@@ -1250,13 +1290,31 @@ extract_range_from_multiplicative_op (value_range_base *vr,
|| code == ROUND_DIV_EXPR
|| code == RSHIFT_EXPR
|| code == LSHIFT_EXPR);
- gcc_assert (vr0->kind () == VR_RANGE
- && vr0->kind () == vr1->kind ());
+ if (!range_int_cst_p (vr1))
+ {
+ vr->set_varying ();
+ return;
+ }
+
+ /* Even if vr0 is VARYING or otherwise not usable, we can derive
+ useful ranges just from the shift count. E.g.
+ x >> 63 for signed 64-bit x is always [-1, 0]. */
+ value_range_base tem = vr0->normalize_symbolics ();
+ tree vr0_min, vr0_max;
+ if (tem.kind () == VR_RANGE)
+ {
+ vr0_min = tem.min ();
+ vr0_max = tem.max ();
+ }
+ else
+ {
+ vr0_min = vrp_val_min (type);
+ vr0_max = vrp_val_max (type);
+ }
- tree type = vr0->type ();
wide_int res_lb, res_ub;
- wide_int vr0_lb = wi::to_wide (vr0->min ());
- wide_int vr0_ub = wi::to_wide (vr0->max ());
+ wide_int vr0_lb = wi::to_wide (vr0_min);
+ wide_int vr0_ub = wi::to_wide (vr0_max);
wide_int vr1_lb = wi::to_wide (vr1->min ());
wide_int vr1_ub = wi::to_wide (vr1->max ());
bool overflow_undefined = TYPE_OVERFLOW_UNDEFINED (type);
@@ -1266,9 +1324,8 @@ extract_range_from_multiplicative_op (value_range_base *vr,
code, TYPE_SIGN (type), prec,
vr0_lb, vr0_ub, vr1_lb, vr1_ub,
overflow_undefined))
- vr->set_and_canonicalize (VR_RANGE,
- wide_int_to_tree (type, res_lb),
- wide_int_to_tree (type, res_ub));
+ vr->set (VR_RANGE, wide_int_to_tree (type, res_lb),
+ wide_int_to_tree (type, res_ub));
else
vr->set_varying ();
}
@@ -1662,19 +1719,30 @@ extract_range_from_binary_expr (value_range_base *vr,
range and see what we end up with. */
if (code == PLUS_EXPR || code == MINUS_EXPR)
{
+ value_range_kind vr0_kind = vr0.kind (), vr1_kind = vr1.kind ();
+ tree vr0_min = vr0.min (), vr0_max = vr0.max ();
+ tree vr1_min = vr1.min (), vr1_max = vr1.max ();
/* This will normalize things such that calculating
[0,0] - VR_VARYING is not dropped to varying, but is
calculated as [MIN+1, MAX]. */
if (vr0.varying_p ())
- vr0.set (VR_RANGE, vrp_val_min (expr_type), vrp_val_max (expr_type));
+ {
+ vr0_kind = VR_RANGE;
+ vr0_min = vrp_val_min (expr_type);
+ vr0_max = vrp_val_max (expr_type);
+ }
if (vr1.varying_p ())
- vr1.set (VR_RANGE, vrp_val_min (expr_type), vrp_val_max (expr_type));
+ {
+ vr1_kind = VR_RANGE;
+ vr1_min = vrp_val_min (expr_type);
+ vr1_max = vrp_val_max (expr_type);
+ }
const bool minus_p = (code == MINUS_EXPR);
- tree min_op0 = vr0.min ();
- tree min_op1 = minus_p ? vr1.max () : vr1.min ();
- tree max_op0 = vr0.max ();
- tree max_op1 = minus_p ? vr1.min () : vr1.max ();
+ tree min_op0 = vr0_min;
+ tree min_op1 = minus_p ? vr1_max : vr1_min;
+ tree max_op0 = vr0_max;
+ tree max_op1 = minus_p ? vr1_min : vr1_max;
tree sym_min_op0 = NULL_TREE;
tree sym_min_op1 = NULL_TREE;
tree sym_max_op0 = NULL_TREE;
@@ -1687,7 +1755,7 @@ extract_range_from_binary_expr (value_range_base *vr,
single-symbolic ranges, try to compute the precise resulting range,
but only if we know that this resulting range will also be constant
or single-symbolic. */
- if (vr0.kind () == VR_RANGE && vr1.kind () == VR_RANGE
+ if (vr0_kind == VR_RANGE && vr1_kind == VR_RANGE
&& (TREE_CODE (min_op0) == INTEGER_CST
|| (sym_min_op0
= get_single_symbol (min_op0, &neg_min_op0, &min_op0)))
@@ -1767,8 +1835,8 @@ extract_range_from_binary_expr (value_range_base *vr,
wide_int wmin, wmax;
wide_int vr0_min, vr0_max;
wide_int vr1_min, vr1_max;
- extract_range_into_wide_ints (&vr0, sign, prec, vr0_min, vr0_max);
- extract_range_into_wide_ints (&vr1, sign, prec, vr1_min, vr1_max);
+ extract_range_into_wide_ints (&vr0, expr_type, vr0_min, vr0_max);
+ extract_range_into_wide_ints (&vr1, expr_type, vr1_min, vr1_max);
if (wide_int_range_min_max (wmin, wmax, code, sign, prec,
vr0_min, vr0_max, vr1_min, vr1_max))
vr->set (VR_RANGE, wide_int_to_tree (expr_type, wmin),
@@ -1785,7 +1853,7 @@ extract_range_from_binary_expr (value_range_base *vr,
vr->set_varying ();
return;
}
- extract_range_from_multiplicative_op (vr, code, &vr0, &vr1);
+ extract_range_from_multiplicative_op (vr, code, &vr0, &vr1, expr_type);
return;
}
else if (code == RSHIFT_EXPR
@@ -1800,13 +1868,8 @@ extract_range_from_binary_expr (value_range_base *vr,
{
if (code == RSHIFT_EXPR)
{
- /* Even if vr0 is VARYING or otherwise not usable, we can derive
- useful ranges just from the shift count. E.g.
- x >> 63 for signed 64-bit x is always [-1, 0]. */
- if (vr0.kind () != VR_RANGE || vr0.symbolic_p ())
- vr0.set (VR_RANGE, vrp_val_min (expr_type),
- vrp_val_max (expr_type));
- extract_range_from_multiplicative_op (vr, code, &vr0, &vr1);
+ extract_range_from_multiplicative_op (vr, code, &vr0, &vr1,
+ expr_type);
return;
}
else if (code == LSHIFT_EXPR
@@ -1822,7 +1885,7 @@ extract_range_from_binary_expr (value_range_base *vr,
{
min = wide_int_to_tree (expr_type, res_lb);
max = wide_int_to_tree (expr_type, res_ub);
- vr->set_and_canonicalize (VR_RANGE, min, max);
+ vr->set (VR_RANGE, min, max);
return;
}
}
@@ -1854,9 +1917,9 @@ extract_range_from_binary_expr (value_range_base *vr,
NOTE: As a future improvement, we may be able to do better
with mixed symbolic (anti-)ranges like [0, A]. See note in
ranges_from_anti_range. */
- extract_range_into_wide_ints (&vr0, sign, prec,
+ extract_range_into_wide_ints (&vr0, expr_type,
dividend_min, dividend_max);
- extract_range_into_wide_ints (&vr1, sign, prec,
+ extract_range_into_wide_ints (&vr1, expr_type,
divisor_min, divisor_max);
if (!wide_int_range_div (wmin, wmax, code, sign, prec,
dividend_min, dividend_max,
@@ -1887,8 +1950,8 @@ extract_range_from_binary_expr (value_range_base *vr,
}
wide_int wmin, wmax, tmp;
wide_int vr0_min, vr0_max, vr1_min, vr1_max;
- extract_range_into_wide_ints (&vr0, sign, prec, vr0_min, vr0_max);
- extract_range_into_wide_ints (&vr1, sign, prec, vr1_min, vr1_max);
+ extract_range_into_wide_ints (&vr0, expr_type, vr0_min, vr0_max);
+ extract_range_into_wide_ints (&vr1, expr_type, vr1_min, vr1_max);
wide_int_range_trunc_mod (wmin, wmax, sign, prec,
vr0_min, vr0_max, vr1_min, vr1_max);
min = wide_int_to_tree (expr_type, wmin);
@@ -1906,8 +1969,8 @@ extract_range_from_binary_expr (value_range_base *vr,
&may_be_nonzero0, &must_be_nonzero0);
vrp_set_zero_nonzero_bits (expr_type, &vr1,
&may_be_nonzero1, &must_be_nonzero1);
- extract_range_into_wide_ints (&vr0, sign, prec, vr0_min, vr0_max);
- extract_range_into_wide_ints (&vr1, sign, prec, vr1_min, vr1_max);
+ extract_range_into_wide_ints (&vr0, expr_type, vr0_min, vr0_max);
+ extract_range_into_wide_ints (&vr1, expr_type, vr1_min, vr1_max);
if (code == BIT_AND_EXPR)
{
if (wide_int_range_bit_and (wmin, wmax, sign, prec,
@@ -2111,8 +2174,7 @@ extract_range_from_unary_expr (value_range_base *vr,
signop outer_sign = TYPE_SIGN (outer_type);
unsigned inner_prec = TYPE_PRECISION (inner_type);
unsigned outer_prec = TYPE_PRECISION (outer_type);
- extract_range_into_wide_ints (&vr0, inner_sign, inner_prec,
- vr0_min, vr0_max);
+ extract_range_into_wide_ints (&vr0, inner_type, vr0_min, vr0_max);
if (wide_int_range_convert (wmin, wmax,
inner_sign, inner_prec,
outer_sign, outer_prec,
@@ -2120,7 +2182,7 @@ extract_range_from_unary_expr (value_range_base *vr,
{
tree min = wide_int_to_tree (outer_type, wmin);
tree max = wide_int_to_tree (outer_type, wmax);
- vr->set_and_canonicalize (VR_RANGE, min, max);
+ vr->set (VR_RANGE, min, max);
}
else
vr->set_varying ();
@@ -2130,7 +2192,7 @@ extract_range_from_unary_expr (value_range_base *vr,
{
wide_int wmin, wmax;
wide_int vr0_min, vr0_max;
- extract_range_into_wide_ints (&vr0, sign, prec, vr0_min, vr0_max);
+ extract_range_into_wide_ints (&vr0, type, vr0_min, vr0_max);
if (wide_int_range_abs (wmin, wmax, sign, prec, vr0_min, vr0_max,
TYPE_OVERFLOW_UNDEFINED (type)))
vr->set (VR_RANGE, wide_int_to_tree (type, wmin),
@@ -2143,7 +2205,8 @@ extract_range_from_unary_expr (value_range_base *vr,
{
wide_int wmin, wmax;
wide_int vr0_min, vr0_max;
- extract_range_into_wide_ints (&vr0, SIGNED, prec, vr0_min, vr0_max);
+ tree signed_type = make_signed_type (TYPE_PRECISION (type));
+ extract_range_into_wide_ints (&vr0, signed_type, vr0_min, vr0_max);
wide_int_range_absu (wmin, wmax, prec, vr0_min, vr0_max);
vr->set (VR_RANGE, wide_int_to_tree (type, wmin),
wide_int_to_tree (type, wmax));
@@ -6027,7 +6090,7 @@ value_range_base::intersect_helper (const value_range_base *vr0,
VR_RANGE can still be a VR_RANGE. Work on a temporary so we can
fall back to vr0 when this turns things to varying. */
value_range_base tem;
- tem.set_and_canonicalize (vr0type, vr0min, vr0max);
+ tem.set (vr0type, vr0min, vr0max);
/* If that failed, use the saved original VR0. */
if (tem.varying_p ())
return *vr0;
@@ -6132,7 +6195,7 @@ value_range_base::union_helper (const value_range_base *vr0,
/* Work on a temporary so we can still use vr0 when union returns varying. */
value_range_base tem;
- tem.set_and_canonicalize (vr0type, vr0min, vr0max);
+ tem.set (vr0type, vr0min, vr0max);
/* Failed to find an efficient meet. Before giving up and setting
the result to VARYING, see if we can at least derive a useful
@@ -6212,6 +6275,58 @@ value_range::union_ (const value_range *other)
}
}
+/* Normalize symbolics into constants. */
+
+value_range_base
+value_range_base::normalize_symbolics () const
+{
+ if (varying_p () || undefined_p ())
+ return *this;
+ tree ttype = type ();
+ bool min_symbolic = !is_gimple_min_invariant (min ());
+ bool max_symbolic = !is_gimple_min_invariant (max ());
+ if (!min_symbolic && !max_symbolic)
+ return *this;
+
+ // [SYM, SYM] -> VARYING
+ if (min_symbolic && max_symbolic)
+ {
+ value_range_base var;
+ var.set_varying ();
+ return var;
+ }
+ if (kind () == VR_RANGE)
+ {
+ // [SYM, NUM] -> [-MIN, NUM]
+ if (min_symbolic)
+ return value_range_base (VR_RANGE, vrp_val_min (ttype), max ());
+ // [NUM, SYM] -> [NUM, +MAX]
+ return value_range_base (VR_RANGE, min (), vrp_val_max (ttype));
+ }
+ gcc_assert (kind () == VR_ANTI_RANGE);
+ // ~[SYM, NUM] -> [NUM + 1, +MAX]
+ if (min_symbolic)
+ {
+ if (!vrp_val_is_max (max ()))
+ {
+ tree n = wide_int_to_tree (ttype, wi::to_wide (max ()) + 1);
+ return value_range_base (VR_RANGE, n, vrp_val_max (ttype));
+ }
+ value_range_base var;
+ var.set_varying ();
+ return var;
+ }
+ // ~[NUM, SYM] -> [-MIN, NUM - 1]
+ if (!vrp_val_is_min (min ()))
+ {
+ tree n = wide_int_to_tree (ttype, wi::to_wide (min ()) - 1);
+ return value_range_base (VR_RANGE, vrp_val_min (ttype), n);
+ }
+ value_range_base var;
+ var.set_varying ();
+ return var;
+}
+
/* Visit all arguments for PHI node PHI that flow through executable
edges. If a valid value range can be derived from all the incoming
value ranges, set a new range for the LHS of PHI. */
diff --git a/gcc/tree-vrp.h b/gcc/tree-vrp.h
index 4ec974f5fdb..b5830851fcb 100644
--- a/gcc/tree-vrp.h
+++ b/gcc/tree-vrp.h
@@ -71,12 +71,13 @@ public:
/* Misc methods. */
tree type () const;
bool may_contain_p (tree) const;
- void set_and_canonicalize (enum value_range_kind, tree, tree);
bool zero_p () const;
bool nonzero_p () const;
bool singleton_p (tree *result = NULL) const;
void dump (FILE *) const;
+ value_range_base normalize_symbolics () const;
+
protected:
void check ();
static value_range_base union_helper (const value_range_base *,
@@ -143,7 +144,6 @@ class GTY((user)) value_range : public value_range_base
/* Misc methods. */
void deep_copy (const value_range *);
- void set_and_canonicalize (enum value_range_kind, tree, tree, bitmap = NULL);
void dump (FILE *) const;
private:
@@ -270,8 +270,8 @@ extern int operand_less_p (tree, tree);
extern bool vrp_val_is_min (const_tree);
extern bool vrp_val_is_max (const_tree);
-extern tree vrp_val_min (const_tree);
-extern tree vrp_val_max (const_tree);
+extern tree vrp_val_min (const_tree, bool handle_pointers = false);
+extern tree vrp_val_max (const_tree, bool handle_pointers = false);
extern void extract_range_from_unary_expr (value_range_base *vr,
enum tree_code code,
diff --git a/gcc/vr-values.c b/gcc/vr-values.c
index 3f20c1a6fe8..10789bdd64e 100644
--- a/gcc/vr-values.c
+++ b/gcc/vr-values.c
@@ -500,9 +500,9 @@ vr_values::extract_range_for_var_from_comparison_expr (tree var,
vice-versa. Use set_and_canonicalize which does this for
us. */
if (cond_code == LE_EXPR)
- vr_p->set_and_canonicalize (VR_RANGE, min, max, vr_p->equiv ());
+ vr_p->set (VR_RANGE, min, max, vr_p->equiv ());
else if (cond_code == GT_EXPR)
- vr_p->set_and_canonicalize (VR_ANTI_RANGE, min, max, vr_p->equiv ());
+ vr_p->set (VR_ANTI_RANGE, min, max, vr_p->equiv ());
else
gcc_unreachable ();
}
@@ -574,7 +574,7 @@ vr_values::extract_range_for_var_from_comparison_expr (tree var,
&& vrp_val_is_max (max))
min = max = limit;
- vr_p->set_and_canonicalize (VR_ANTI_RANGE, min, max, vr_p->equiv ());
+ vr_p->set (VR_ANTI_RANGE, min, max, vr_p->equiv ());
}
else if (cond_code == LE_EXPR || cond_code == LT_EXPR)
{
