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-rw-r--r--StdLib/LibC/CRT/Ia32/ullshr.c57
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diff --git a/StdLib/LibC/CRT/Ia32/ullshr.c b/StdLib/LibC/CRT/Ia32/ullshr.c
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--- a/StdLib/LibC/CRT/Ia32/ullshr.c
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-/** @file
- 64-bit Math Worker Function.
- The 32-bit versions of C compiler generate calls to library routines
- to handle 64-bit math. These functions use non-standard calling conventions.
-
- Copyright (c) 2009 - 2011, 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.
-
-**/
-
-
-/*
- * Shifts a 64-bit unsigned value right by a certain number of bits.
- */
-__declspec(naked) void __cdecl _aullshr (void)
-{
- _asm {
- ;
- ; Checking: Only handle 64bit shifting or more
- ;
- cmp cl, 64
- jae _Exit
-
- ;
- ; Handle shifting between 0 and 31 bits
- ;
- cmp cl, 32
- jae More32
- shrd eax, edx, cl
- shr edx, cl
- ret
-
- ;
- ; Handle shifting of 32-63 bits
- ;
-More32:
- mov eax, edx
- xor edx, edx
- and cl, 31
- shr eax, cl
- ret
-
- ;
- ; Invalid number (less then 32bits), return 0
- ;
-_Exit:
- xor eax, eax
- xor edx, edx
- ret
- }
-}