re PR tree-optimization/63302 (Code with 64-bit long long constants is miscompiled on 32-bit host)

	PR tree-optimization/63302
	* tree-ssa-reassoc.c (optimize_range_tests_xor,
	optimize_range_tests_diff): Use !integer_pow2p () instead of
	tree_log2 () < 0.

	* gcc.c-torture/execute/pr63302.c: New test.

From-SVN: r216391

gcc/ChangeLog

+2014-10-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/63302
+	* tree-ssa-reassoc.c (optimize_range_tests_xor,
+	optimize_range_tests_diff): Use !integer_pow2p () instead of
+	tree_log2 () < 0.
+
 2014-10-17  Martin Liska  <mliska@suse.cz>
 
 	* ipa-icf.c (sem_function::merge): Local flags are set to false

gcc/testsuite/ChangeLog

+2014-10-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/63302
+	* gcc.c-torture/execute/pr63302.c: New test.
+
 2014-10-17  Tom de Vries  <tom@codesourcery.com>
 
 	PR rtl-optimization/61605

gcc/testsuite/gcc.c-torture/execute/pr63302.c

+/* PR tree-optimization/63302 */
+
+#ifdef __SIZEOF_INT128__
+#if __SIZEOF_INT128__ * __CHAR_BIT__ == 128
+#define USE_INT128
+#endif
+#endif
+#if __SIZEOF_LONG_LONG__ * __CHAR_BIT__ == 64
+#define USE_LLONG
+#endif
+
+#ifdef USE_INT128
+__attribute__((noinline, noclone)) int
+foo (__int128 x)
+{
+  __int128 v = x & (((__int128) -1 << 63) | 0x7ff);
+ 
+  return v == 0 || v == ((__int128) -1 << 63);
+}
+#endif
+
+#ifdef USE_LLONG
+__attribute__((noinline, noclone)) int
+bar (long long x)
+{
+  long long v = x & (((long long) -1 << 31) | 0x7ff);
+ 
+  return v == 0 || v == ((long long) -1 << 31);
+}
+#endif
+
+int
+main ()
+{
+#ifdef USE_INT128
+  if (foo (0) != 1
+      || foo (1) != 0
+      || foo (0x800) != 1
+      || foo (0x801) != 0
+      || foo ((__int128) 1 << 63) != 0
+      || foo ((__int128) -1 << 63) != 1
+      || foo (((__int128) -1 << 63) | 1) != 0
+      || foo (((__int128) -1 << 63) | 0x800) != 1
+      || foo (((__int128) -1 << 63) | 0x801) != 0)
+    __builtin_abort ();
+#endif
+#ifdef USE_LLONG
+  if (bar (0) != 1
+      || bar (1) != 0
+      || bar (0x800) != 1
+      || bar (0x801) != 0
+      || bar (1LL << 31) != 0
+      || bar (-1LL << 31) != 1
+      || bar ((-1LL << 31) | 1) != 0
+      || bar ((-1LL << 31) | 0x800) != 1
+      || bar ((-1LL << 31) | 0x801) != 0)
+    __builtin_abort ();
+#endif
+  return 0;
+}

gcc/tree-ssa-reassoc.c

@@ -2200,7 +2200,7 @@ optimize_range_tests_xor (enum tree_code opcode, tree type,
   lowxor = fold_binary (BIT_XOR_EXPR, type, lowi, lowj);
   if (lowxor == NULL_TREE || TREE_CODE (lowxor) != INTEGER_CST)
     return false;
-  if (tree_log2 (lowxor) < 0)
+  if (!integer_pow2p (lowxor))
     return false;
   highxor = fold_binary (BIT_XOR_EXPR, type, highi, highj);
   if (!tree_int_cst_equal (lowxor, highxor))
@@ -2247,7 +2247,7 @@ optimize_range_tests_diff (enum tree_code opcode, tree type,
   tem1 = fold_binary (MINUS_EXPR, type, lowj, lowi);
   if (tem1 == NULL_TREE || TREE_CODE (tem1) != INTEGER_CST)
     return false;
-  if (tree_log2 (tem1) < 0)
+  if (!integer_pow2p (tem1))
     return false;
 
   type = unsigned_type_for (type);