x86_64: Fix neg_double

In a case, when src and dest regs are the same, previous
implementation of the neg_double bytecode returns an
incorrect result.

This implementation uses shifts and xor and works for both
cases.

Change-Id: I137d9a90298ec225d80435d35558da8abb69cd01
Signed-off-by: Alexei Zavjalov <alexei.zavjalov@intel.com>

3 files changed, 33 insertions, 0 deletions

diff --git a/test/112-double-math/expected.txt b/test/112-double-math/expected.txt
new file mode 100644
index 0000000..1e10a95
--- /dev/null
+++ b/test/112-double-math/expected.txt
@@ -0,0 +1 @@
+cond_neg_double PASSED
diff --git a/test/112-double-math/info.txt b/test/112-double-math/info.txt
new file mode 100644
index 0000000..a32f4e0
--- /dev/null
+++ b/test/112-double-math/info.txt
@@ -0,0 +1 @@
+This checks the neg_double bytecode.
diff --git a/test/112-double-math/src/Main.java b/test/112-double-math/src/Main.java
new file mode 100644
index 0000000..8172dfa
--- /dev/null
+++ b/test/112-double-math/src/Main.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class Main {
+    public static double cond_neg_double(double value, boolean cond) {
+        return cond ? -value : value;
+    }
+
+    public static void main(String args[]) {
+        double result = cond_neg_double(-1.0d, true);
+
+        if (Double.doubleToRawLongBits(result) == 0x3ff0000000000000L) {
+            System.out.println("cond_neg_double PASSED");
+        } else {
+            System.out.println("cond_neg_double FAILED " + result);
+        }
+    }
+}