Implement bswaphi2 with rev16 (AArch64)

From-SVN: r193729

gcc/ChangeLog

+2012-11-22  Ian Bolton  <ian.bolton@arm.com>
+
+	* config/aarch64/aarch64.md (bswaphi2): New pattern.
+
 2012-11-22  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR sanitizer/55379

gcc/config/aarch64/aarch64.md

@@ -2312,6 +2312,15 @@
    (set_attr "mode" "<MODE>")]
 )
 
+(define_insn "bswaphi2"
+  [(set (match_operand:HI 0 "register_operand" "=r")
+        (bswap:HI (match_operand:HI 1 "register_operand" "r")))]
+  ""
+  "rev16\\t%w0, %w1"
+  [(set_attr "v8type" "rev")
+   (set_attr "mode" "HI")]
+)
+
 ;; -------------------------------------------------------------------
 ;; Floating-point intrinsics
 ;; -------------------------------------------------------------------

gcc/testsuite/ChangeLog

+2012-11-22  Ian Bolton  <ian.bolton@arm.com>
+
+	* gcc.target/aarch64/builtin-bswap-1.c: New test.
+	* gcc.target/aarch64/builtin-bswap-2.c: New test.
+
 2012-11-22  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/55432

gcc/testsuite/gcc.target/aarch64/builtin-bswap-1.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+/* { dg-final { scan-assembler-times "rev16\\t" 2 } }  */
+
+/* rev16 */
+short
+swaps16 (short x)
+{
+  return __builtin_bswap16 (x);
+}
+
+/* rev16 */
+unsigned short
+swapu16 (unsigned short x)
+{
+  return __builtin_bswap16 (x);
+}

gcc/testsuite/gcc.target/aarch64/builtin-bswap-2.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+/* { dg-final { scan-assembler-times "rev16\\t" 2 } }  */
+
+/* rev16 */
+unsigned short
+swapu16_1 (unsigned short x)
+{
+  return (x << 8) | (x >> 8);
+}
+
+/* rev16 */
+unsigned short
+swapu16_2 (unsigned short x)
+{
+  return (x >> 8) | (x << 8);
+}