Hi!
As mentioned in the PR, we ICE because lhs is singleton [0, 0]
or [1, 1] but op2 (or in other cases op1) is undefined and op?.*_bound ()
ICEs on those because there are no pairs for UNDEFINED.
The following patch makes us set r to varying or return false in those
cases.
Included is a version of the patch I've bootstrapped/regtested successfully
on x86_64-linux and i686-linux, attached is a slight modification more
consistent with the range-op-float.cc patch.
Ok for trunk (and which one)?
2023-02-03 Jakub Jelinek <ja...@redhat.com>
PR tree-optimization/108647
* range-op.cc (operator_equal::op1_range,
operator_not_equal::op1_range): Don't test op2 bound
equality if op2.undefined_p (), instead set_varying.
(operator_lt::op1_range, operator_le::op1_range,
operator_gt::op1_range, operator_ge::op1_range): Return false if
op2.undefined_p ().
(operator_lt::op2_range, operator_le::op2_range,
operator_gt::op2_range, operator_ge::op2_range): Return false if
op1.undefined_p ().
* g++.dg/torture/pr108647.C: New test.
--- gcc/range-op.cc.jj 2023-02-03 10:51:40.699003658 +0100
+++ gcc/range-op.cc 2023-02-03 17:26:02.204429931 +0100
@@ -642,7 +642,8 @@ operator_equal::op1_range (irange &r, tr
case BRS_FALSE:
// If the result is false, the only time we know anything is
// if OP2 is a constant.
- if (wi::eq_p (op2.lower_bound(), op2.upper_bound()))
+ if (!op2.undefined_p ()
+ && wi::eq_p (op2.lower_bound(), op2.upper_bound()))
{
r = op2;
r.invert ();
@@ -755,7 +756,8 @@ operator_not_equal::op1_range (irange &r
case BRS_TRUE:
// If the result is true, the only time we know anything is if
// OP2 is a constant.
- if (wi::eq_p (op2.lower_bound(), op2.upper_bound()))
+ if (!op2.undefined_p ()
+ && wi::eq_p (op2.lower_bound(), op2.upper_bound()))
{
r = op2;
r.invert ();
@@ -920,6 +922,9 @@ operator_lt::op1_range (irange &r, tree
const irange &op2,
relation_trio) const
{
+ if (op2.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
@@ -942,6 +947,9 @@ operator_lt::op2_range (irange &r, tree
const irange &op1,
relation_trio) const
{
+ if (op1.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
@@ -1031,6 +1039,9 @@ operator_le::op1_range (irange &r, tree
const irange &op2,
relation_trio) const
{
+ if (op2.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
@@ -1053,6 +1064,9 @@ operator_le::op2_range (irange &r, tree
const irange &op1,
relation_trio) const
{
+ if (op1.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
@@ -1141,6 +1155,9 @@ operator_gt::op1_range (irange &r, tree
const irange &lhs, const irange &op2,
relation_trio) const
{
+ if (op2.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
@@ -1163,6 +1180,9 @@ operator_gt::op2_range (irange &r, tree
const irange &op1,
relation_trio) const
{
+ if (op1.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
@@ -1252,6 +1272,9 @@ operator_ge::op1_range (irange &r, tree
const irange &op2,
relation_trio) const
{
+ if (op2.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
@@ -1274,6 +1297,9 @@ operator_ge::op2_range (irange &r, tree
const irange &op1,
relation_trio) const
{
+ if (op1.undefined_p ())
+ return false;
+
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
--- gcc/testsuite/g++.dg/torture/pr108647.C.jj 2023-02-03 16:36:18.347255058
+0100
+++ gcc/testsuite/g++.dg/torture/pr108647.C 2023-02-03 16:32:16.338811259
+0100
@@ -0,0 +1,25 @@
+// PR tree-optimization/108647
+// { dg-do compile }
+
+bool a;
+int b, c;
+
+inline const bool &
+foo (bool &e, const bool &f)
+{
+ return f < e ? f : e;
+}
+
+void
+bar (signed char e, bool *f, bool *h, bool *g)
+{
+ for (;;)
+ if (g)
+ for (signed char j = 0; j < 6;
+ j += ((f[0] & c ? g[0] : int(0 >= e))
+ ? 0 : foo (g[0], g[0] > h[0]) + 1))
+ {
+ a = 0;
+ b = 0;
+ }
+}
Jakub
