mirror of https://github.com/acidanthera/audk.git
63 lines
1.6 KiB
ArmAsm
63 lines
1.6 KiB
ArmAsm
#------------------------------------------------------------------------------
|
|
#
|
|
# Copyright (c) 2014, 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:
|
|
#
|
|
# MathLShiftS64.S
|
|
#
|
|
# Abstract:
|
|
#
|
|
# 64-bit Math Worker Function.
|
|
# Shifts a 64-bit signed value left by a certain number of bits.
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
|
|
.686:
|
|
.code:
|
|
|
|
ASM_GLOBAL ASM_PFX(__ashldi3)
|
|
|
|
#------------------------------------------------------------------------------
|
|
#
|
|
# void __cdecl __ashldi3 (void)
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
ASM_PFX(__ashldi3):
|
|
#
|
|
# Handle shifting of 64 or more bits (return 0)
|
|
#
|
|
cmpb $64, %cl
|
|
jae ReturnZero
|
|
|
|
#
|
|
# Handle shifting of between 0 and 31 bits
|
|
#
|
|
cmpb $32, %cl
|
|
jae More32
|
|
shld %cl, %eax, %edx
|
|
shl %cl, %eax
|
|
ret
|
|
|
|
#
|
|
# Handle shifting of between 32 and 63 bits
|
|
#
|
|
More32:
|
|
movl %eax, %edx
|
|
xor %eax, %eax
|
|
and $31, %cl
|
|
shl %cl, %edx
|
|
ret
|
|
|
|
ReturnZero:
|
|
xor %eax, %eax
|
|
xor %edx, %edx
|
|
ret
|