1 files changed, 39 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/Ia32/ARShiftU64.nasm b/roms/edk2/MdePkg/Library/BaseLib/Ia32/ARShiftU64.nasm
new file mode 100644
index 000000000..94aa88229
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/Ia32/ARShiftU64.nasm
@@ -0,0 +1,39 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   ARShiftU64.nasm
+;
+; Abstract:
+;
+;   64-bit arithmetic right shift function for IA-32
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalMathARShiftU64 (
+;   IN      UINT64                    Operand,
+;   IN      UINTN                     Count
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMathARShiftU64)
+ASM_PFX(InternalMathARShiftU64):
+    mov     cl, [esp + 12]
+    mov     eax, [esp + 8]
+    cdq
+    test    cl, 32
+    jnz     .0
+    mov     edx, eax
+    mov     eax, [esp + 4]
+.0:
+    shrd    eax, edx, cl
+    sar     edx, cl
+    ret
+