2aa62f2bc9
This set of three packages: AppPkg, StdLib, StdLibPrivateInternalFiles; contains the implementation of libraries based upon non-UEFI standards such as ISO/IEC-9899, the library portion of the C Language Standard, POSIX, etc. AppPkg contains applications that make use of the standard libraries defined in the StdLib Package. StdLib contains header (include) files and the implementations of the standard libraries. StdLibPrivateInternalFiles contains files for the exclusive use of the library implementations in StdLib. These files should never be directly referenced from applications or other code. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11600 6f19259b-4bc3-4df7-8a09-765794883524
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/** @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
|
|
}
|
|
}
|