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47 lines
1.4 KiB
47 lines
1.4 KiB
4 years ago
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2018, 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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# RShiftU64.S
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#
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# Abstract:
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#
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# 64-bit logical right shift function for IA-32
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#
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#------------------------------------------------------------------------------
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.code:
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ASM_GLOBAL ASM_PFX(InternalMathRShiftU64)
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#------------------------------------------------------------------------------
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# UINT64
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# EFIAPI
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# InternalMathRShiftU64 (
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# IN UINT64 Operand,
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# IN UINTN Count
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# );
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#------------------------------------------------------------------------------
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ASM_PFX(InternalMathRShiftU64):
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movb 12(%esp), %cl # cl <- Count
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xorl %edx, %edx
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movl 8(%esp), %eax
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testb $32, %cl # Count >= 32?
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jnz L0
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movl %eax, %edx
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movl 0x4(%esp), %eax
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L0:
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shrdl %cl, %edx, %eax
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shr %cl, %edx
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ret
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