1 files changed, 43 insertions, 0 deletions
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/switchu8.S b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/switchu8.S
new file mode 100644
index 0000000000..e49204fdd4
--- /dev/null
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/switchu8.S
@@ -0,0 +1,43 @@
+#------------------------------------------------------------------------------ 
+#
+# Copyright (c) 2008-2009 Apple Inc. All rights reserved.
+#
+# All rights reserved. This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#------------------------------------------------------------------------------
+
+#/** @file
+#  Compiler intrinsic for ARM compiler
+#
+#  Copyright (c) 2008, Apple, Inc.
+#  All rights reserved. This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution.  The full text of the license may be found at
+#  http)://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.;
+#
+#**/
+#        
+
+.text
+.p2align 2
+
+.globl ASM_PFX(__switchu8)
+
+
+ASM_PFX(__switchu8):
+    ldrb      ip,[lr,#-1]
+    cmp       r3,ip
+    ldrccb    r3,[lr,r3]
+    ldrcsb    r3,[lr,ip]
+    add       ip,lr,r3,LSL #1
+    bx        ip
+