Revert "Revert "Optimizing: Fix long-to-fp conversion on x86.""

This reverts commit 386ce406f150645158d6067c4e0a36565aefc44f.

Bug: 20413424
Change-Id: I6e93ff132907f2653f1ae12d6676ff2298f62ca1

3 files changed, 42 insertions, 0 deletions

diff --git a/test/477-long-to-float-conversion-precision/expected.txt b/test/477-long-to-float-conversion-precision/expected.txt
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/test/477-long-to-float-conversion-precision/expected.txt
diff --git a/test/477-long-to-float-conversion-precision/info.txt b/test/477-long-to-float-conversion-precision/info.txt
new file mode 100644
index 0000000000..d9d41d70ba
--- /dev/null
+++ b/test/477-long-to-float-conversion-precision/info.txt
@@ -0,0 +1 @@
+Tests for type conversions precision.
diff --git a/test/477-long-to-float-conversion-precision/src/Main.java b/test/477-long-to-float-conversion-precision/src/Main.java
new file mode 100644
index 0000000000..bc17053e20
--- /dev/null
+++ b/test/477-long-to-float-conversion-precision/src/Main.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+// Note that $opt$ is a marker for the optimizing compiler to ensure
+// it does compile the method.
+public class Main {
+
+  public static void assertFloatEquals(float expected, float result) {
+    if (expected != result) {
+      throw new Error("Expected: " + expected + ", found: " + result);
+    }
+  }
+
+  public static void main(String[] args) {
+    // Generate, compile and check long-to-float Dex instructions.
+    longToFloat();
+  }
+
+  private static void longToFloat() {
+    // The result for this test case is slightly less accurate on ARM,
+    // due to the implementation of long-to-float type conversions for
+    // this architecture (both in Quick and Optimizing).
+    assertFloatEquals(Float.intBitsToFloat(-555858671), $opt$LongToFloat(-8008112895877447681L));
+  }
+
+  // This method produces a long-to-float Dex instruction.
+  static float $opt$LongToFloat(long a) { return (float)a; }
+}