builtins.c (java_builtins): Use popcount* and bswap* builtins to implement bitCount() and reverseBytes()...

2016-05-31  Roger Sayle  <roger@nextmovesoftware.com>

gcc/java:
	* builtins.c (java_builtins): Use popcount* and bswap* builtins to
	implement bitCount() and reverseBytes() methods in java.lang.Integer
	and friends.
	(initialize_builtins): Annotate math builtins with ECF_LEAF.  Call
	define_builtin for the new popcount* and bswap* builtins.

libjava:
	* testsuite/libjava.lang/BuiltinBitCount.java: New test case.
	* testsuite/libjava.lang/BuiltinReverseBytes.java: Likewise.

From-SVN: r236919

1 files changed, 62 insertions, 0 deletions

diff --git a/libjava/testsuite/libjava.lang/BuiltinReverseBytes.java b/libjava/testsuite/libjava.lang/BuiltinReverseBytes.java
new file mode 100644
index 0000000..0d2e332
--- /dev/null
+++ b/libjava/testsuite/libjava.lang/BuiltinReverseBytes.java
@@ -0,0 +1,62 @@
+class BuiltinReverseBytes
+{
+  public static short bswap16(short x)
+  {
+    return Short.reverseBytes(x);
+  }
+
+  public static int bswap32(int x)
+  {
+    return Integer.reverseBytes(x);
+  }
+
+  public static long bswap64(long x)
+  {
+    return Long.reverseBytes(x);
+  }
+
+  public static void main(String[] args)
+  {
+    if (Short.reverseBytes((short)0) != (short)0)
+      throw new Error();
+    if (Short.reverseBytes((short)0x1234) != (short)0x3412)
+      throw new Error();
+    if (Short.reverseBytes((short)-1) != (short)-1)
+      throw new Error();
+     
+    if (Integer.reverseBytes(0) != 0)
+      throw new Error();
+    if (Integer.reverseBytes(0x12345678) != 0x78563412)
+      throw new Error();
+    if (Integer.reverseBytes(-1) != -1)
+      throw new Error();
+
+    if (Long.reverseBytes(0L) != 0L)
+      throw new Error();
+    if (Long.reverseBytes(0x123456789abcde0fL) != 0x0fdebc9a78563412L)
+      throw new Error();
+    if (Long.reverseBytes(-1L) != -1L)
+      throw new Error();
+
+    if (bswap16((short)0) != (short)0)
+      throw new Error();
+    if (bswap16((short)0x1234) != (short)0x3412)
+      throw new Error();
+    if (bswap16((short)-1) != (short)-1)
+      throw new Error();
+     
+    if (bswap32(0) != 0)
+      throw new Error();
+    if (bswap32(0x12345678) != 0x78563412)
+      throw new Error();
+    if (bswap32(-1) != -1)
+      throw new Error();
+
+    if (bswap64(0L) != 0L)
+      throw new Error();
+    if (bswap64(0x123456789abcde0fL) != 0x0fdebc9a78563412L)
+      throw new Error();
+    if (bswap64(-1L) != -1L)
+      throw new Error();
+  }
+}