Add an alternative rev16 pattern. We should figure out a better way to handle these complex rev patterns. rdar://9609108

llvm-svn: 133289

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/rev.ll b/llvm/test/CodeGen/ARM/rev.ll
index 5739086267e..c210a55b66f 100644
--- a/llvm/test/CodeGen/ARM/rev.ll
+++ b/llvm/test/CodeGen/ARM/rev.ll
@@ -67,3 +67,20 @@ entry:
   %or = or i32 %shr, %and
   ret i32 %or
 }
+
+; rdar://9609108
+define i32 @test6(i32 %x) nounwind readnone {
+entry:
+; CHECK: test6
+; CHECK: rev16 r0, r0
+  %and = shl i32 %x, 8
+  %shl = and i32 %and, 65280
+  %and2 = lshr i32 %x, 8
+  %shr11 = and i32 %and2, 255
+  %shr5 = and i32 %and2, 16711680
+  %shl9 = and i32 %and, -16777216
+  %or = or i32 %shr5, %shl9
+  %or6 = or i32 %or, %shr11
+  %or10 = or i32 %or6, %shl
+  ret i32 %or10
+}