#------------------------------------------------------------------------------ | |
# | |
# Copyright (c) 2009 - 2010, 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 |