mirror of https://github.com/acidanthera/audk.git
67 lines
1.6 KiB
ArmAsm
67 lines
1.6 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2009 - 2013, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this 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 $31, %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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