[gcc r13-5264] value-relation: Fix up relation_union [PR108447]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:c81e68a9cdbb5411dce1f1da3b35854212305c7c

commit r13-5264-gc81e68a9cdbb5411dce1f1da3b35854212305c7c
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Jan 19 23:26:35 2023 +0100

    value-relation: Fix up relation_union [PR108447]
    
    While looking at the PR, I've noticed one row in rr_union_table
    is wrong.  relation_union should be commutative, but due to that
    bug is not.  The following patch adds a self-test for that
    property (fails without the first hunk) and fixes that line.
    
    The actual floating point relation problem isn't fixed by this patch
    though.
    
    2023-01-19  Jakub Jelinek  <jakub@redhat.com>
    
            PR tree-optimization/108447
            * value-relation.cc (rr_union_table): Fix VREL_UNDEFINED row order.
            (relation_tests): Add self-tests for relation_{intersect,union}
            commutativity.
            * selftest.h (relation_tests): Declare.
            * function-tests.cc (test_ranges): Call it.

Diff:
---
 gcc/function-tests.cc |  1 +
 gcc/selftest.h        |  1 +
 gcc/value-relation.cc | 25 ++++++++++++++++++++++++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/gcc/function-tests.cc b/gcc/function-tests.cc
index 846226d99e2..39970b2fcfd 100644
--- a/gcc/function-tests.cc
+++ b/gcc/function-tests.cc
@@ -583,6 +583,7 @@ test_ranges ()
   push_cfun (fun);
   range_tests ();
   range_op_tests ();
+  relation_tests ();
 
   build_cfg (fndecl);
   convert_to_ssa (fndecl);
diff --git a/gcc/selftest.h b/gcc/selftest.h
index 1abec2dd69b..20d522afda4 100644
--- a/gcc/selftest.h
+++ b/gcc/selftest.h
@@ -244,6 +244,7 @@ extern void predict_cc_tests ();
 extern void pretty_print_cc_tests ();
 extern void range_tests ();
 extern void range_op_tests ();
+extern void relation_tests ();
 extern void gimple_range_tests ();
 extern void read_rtl_function_cc_tests ();
 extern void rtl_tests_cc_tests ();
diff --git a/gcc/value-relation.cc b/gcc/value-relation.cc
index b8fa7653232..6f8a1b7e7d3 100644
--- a/gcc/value-relation.cc
+++ b/gcc/value-relation.cc
@@ -115,7 +115,7 @@ relation_kind rr_union_table[VREL_LAST][VREL_LAST] = {
   { VREL_VARYING, VREL_VARYING, VREL_VARYING, VREL_VARYING, VREL_VARYING,
     VREL_VARYING, VREL_VARYING, VREL_VARYING },
 // VREL_UNDEFINED
-  { VREL_VARYING, VREL_LT, VREL_LE, VREL_GT, VREL_GE, VREL_UNDEFINED,
+  { VREL_VARYING, VREL_UNDEFINED, VREL_LT, VREL_LE, VREL_GT, VREL_GE,
     VREL_EQ, VREL_NE },
 // VREL_LT
   { VREL_VARYING, VREL_LT, VREL_LT, VREL_LE, VREL_NE, VREL_VARYING, VREL_LE,
@@ -1718,3 +1718,26 @@ equiv_relation_iterator::get_name (relation_kind *rel)
     }
   return NULL_TREE;
 }
+
+#if CHECKING_P
+#include "selftest.h"
+
+namespace selftest
+{
+void
+relation_tests ()
+{
+  // Verify commutativity of relation_intersect and relation_union.
+  for (relation_kind r1 = VREL_VARYING; r1 < VREL_PE8;
+       r1 = relation_kind (r1 + 1))
+    for (relation_kind r2 = VREL_VARYING; r2 < VREL_PE8;
+	 r2 = relation_kind (r2 + 1))
+      {
+	ASSERT_EQ (relation_intersect (r1, r2), relation_intersect (r2, r1));
+	ASSERT_EQ (relation_union (r1, r2), relation_union (r2, r1));
+      }
+}
+
+} // namespace selftest
+
+#endif // CHECKING_P