1 files changed, 49 insertions, 0 deletions
diff --git a/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.nasm b/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.nasm
new file mode 100644
index 0000000000..9bf1711c9b
--- /dev/null
+++ b/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.nasm
@@ -0,0 +1,49 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+; 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.
+;
+; Module Name:
+;
+;   MathRShiftU64.nasm
+;
+; Abstract:
+;
+;   64-bit Math Worker Function.
+;   Shifts a 64-bit unsigned value right by a certain number of bits.
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+;
+; void __cdecl __ashrdi3 (void)
+;
+;------------------------------------------------------------------------------
+global ASM_PFX(__ashrdi3)
+ASM_PFX(__ashrdi3):
+    cmp cl,0x40
+    jnc _Exit
+    cmp cl,0x20
+    jnc More32
+    shrd eax,edx,cl
+    shr edx,cl
+    ret
+More32:
+    mov eax,edx
+    xor edx,edx
+    and cl,0x1f
+    shr eax,cl
+    ret
+_Exit:
+    xor eax,eax
+    xor edx,edx
+    ret
+