[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / RShiftU64.S

#------------------------------------------------------------------------------
#
# Copyright (c) 2006, Intel Corporation
# All rights reserved. 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.
#
# Module Name:
#
#   RShiftU64.asm
#
# Abstract:
#
#   64-bit logical right shift function for IA-32
#
#------------------------------------------------------------------------------

    .686:
    .code:

.globl ASM_PFX(InternalMathRShiftU64)

#------------------------------------------------------------------------------
# UINT64
# EFIAPI
# InternalMathRShiftU64 (
#   IN      UINT64                    Operand,
#   IN      UINTN                     Count
#   );
#------------------------------------------------------------------------------
ASM_PFX(InternalMathRShiftU64):
    movb    12(%esp), %cl
    xorl    %edx, %edx
    movl    8(%esp), %eax
    testb   $32, %cl
    cmovz   %eax, %edx
    cmovz   0x4(%esp), %eax
    shrdl   %cl, %edx, %eax
    shr     %cl, %edx
    ret
Commit	Line	Data
	1	#------------------------------------------------------------------------------
	2	#
	3	# Copyright (c) 2006, Intel Corporation
	4	# All rights reserved. This program and the accompanying materials
	5	# are licensed and made available under the terms and conditions of the BSD License
	6	# which accompanies this distribution. The full text of the license may be found at
	7	# http://opensource.org/licenses/bsd-license.php
	8	#
	9	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	10	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
	11	#
	12	# Module Name:
	13	#
	14	# RShiftU64.asm
	15	#
	16	# Abstract:
	17	#
	18	# 64-bit logical right shift function for IA-32
	19	#
	20	#------------------------------------------------------------------------------
	21
	22	.686:
	23	.code:
	24
	25	.globl ASM_PFX(InternalMathRShiftU64)
	26
	27	#------------------------------------------------------------------------------
	28	# UINT64
	29	# EFIAPI
	30	# InternalMathRShiftU64 (
	31	# IN UINT64 Operand,
	32	# IN UINTN Count
	33	# );
	34	#------------------------------------------------------------------------------
	35	ASM_PFX(InternalMathRShiftU64):
	36	movb 12(%esp), %cl
	37	xorl %edx, %edx
	38	movl 8(%esp), %eax
	39	testb $32, %cl
	40	cmovz %eax, %edx
	41	cmovz 0x4(%esp), %eax
	42	shrdl %cl, %edx, %eax
	43	shr %cl, %edx
	44	ret