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
67 lines
1.6 KiB
ArmAsm
67 lines
1.6 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials are licensed and made available
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# under the terms and conditions of the BSD License which accompanies this
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# distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php.
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# MathRShiftU64.S
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#
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# Abstract:
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#
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# 64-bit Math Worker Function.
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# Shifts a 64-bit unsigned value right by a certain number of bits.
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#
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#------------------------------------------------------------------------------
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.686:
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.code:
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ASM_GLOBAL ASM_PFX(__ashrdi3)
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#------------------------------------------------------------------------------
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#
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# void __cdecl __ashrdi3 (void)
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#
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#------------------------------------------------------------------------------
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ASM_PFX(__ashrdi3):
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#
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# Checking: Only handle 64bit shifting or more
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#
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cmpb $64, %cl
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jae _Exit
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#
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# Handle shifting between 0 and 31 bits
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#
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cmpb $32, %cl
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jae More32
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shrd %cl, %edx, %eax
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shr %cl, %edx
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ret
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#
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# Handle shifting of 32-63 bits
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#
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More32:
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movl %edx, %eax
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xor %edx, %edx
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and $32, %cl
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shr %cl, %eax
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ret
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#
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# Invalid number (less then 32bits), return 0
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#
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_Exit:
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xor %eax, %eax
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xor %edx, %edx
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ret
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