mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-11 14:28:08 +01:00
67 lines
1.6 KiB
ArmAsm
67 lines
1.6 KiB
ArmAsm
#------------------------------------------------------------------------------
|
|
#
|
|
# Copyright (c) 2009 - 2013, 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.
|
|
#
|
|
# Module Name:
|
|
#
|
|
# MathRShiftU64.S
|
|
#
|
|
# Abstract:
|
|
#
|
|
# 64-bit Math Worker Function.
|
|
# Shifts a 64-bit unsigned value right by a certain number of bits.
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
|
|
|
|
.686:
|
|
.code:
|
|
|
|
ASM_GLOBAL ASM_PFX(__ashrdi3)
|
|
|
|
#------------------------------------------------------------------------------
|
|
#
|
|
# void __cdecl __ashrdi3 (void)
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
ASM_PFX(__ashrdi3):
|
|
#
|
|
# Checking: Only handle 64bit shifting or more
|
|
#
|
|
cmpb $64, %cl
|
|
jae _Exit
|
|
|
|
#
|
|
# Handle shifting between 0 and 31 bits
|
|
#
|
|
cmpb $32, %cl
|
|
jae More32
|
|
shrd %cl, %edx, %eax
|
|
shr %cl, %edx
|
|
ret
|
|
|
|
#
|
|
# Handle shifting of 32-63 bits
|
|
#
|
|
More32:
|
|
movl %edx, %eax
|
|
xor %edx, %edx
|
|
and $31, %cl
|
|
shr %cl, %eax
|
|
ret
|
|
|
|
#
|
|
# Invalid number (less then 32bits), return 0
|
|
#
|
|
_Exit:
|
|
xor %eax, %eax
|
|
xor %edx, %edx
|
|
ret
|