1 files changed, 43 insertions, 0 deletions
diff --git a/roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.nasm b/roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.nasm
new file mode 100644
index 000000000..1d51a4dfa
--- /dev/null
+++ b/roms/edk2/CryptoPkg/Library/IntrinsicLib/Ia32/MathRShiftU64.nasm
@@ -0,0 +1,43 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; 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
+