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Diffstat (limited to 'ArmPkg/Library/CompilerIntrinsicsLib/Arm/lshrdi3.c')
-rw-r--r-- | ArmPkg/Library/CompilerIntrinsicsLib/Arm/lshrdi3.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/lshrdi3.c b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/lshrdi3.c new file mode 100644 index 0000000000..14b3c8f00a --- /dev/null +++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/lshrdi3.c @@ -0,0 +1,83 @@ +/** @file + + Copyright (c) 2008-2009, Apple Inc. All rights reserved. + + 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. + +**/ +/** + University of Illinois/NCSA + Open Source License + + Copyright (c) 2003-2008 University of Illinois at Urbana-Champaign. + All rights reserved. + + Developed by: + + LLVM Team + + University of Illinois at Urbana-Champaign + + http://llvm.org + + Permission is hereby granted, free of charge, to any person obtaining a copy of + this software and associated documentation files (the "Software"), to deal with + the Software without restriction, including without limitation the rights to + use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies + of the Software, and to permit persons to whom the Software is furnished to do + so, subject to the following conditions: + + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimers. + + * Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimers in the + documentation and/or other materials provided with the distribution. + + * Neither the names of the LLVM Team, University of Illinois at + Urbana-Champaign, nor the names of its contributors may be used to + endorse or promote products derived from this Software without specific + prior written permission. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS + FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE + SOFTWARE. +**/ + +#include "Llvm_int_lib.h" + +// Returns: logical a >> b + +// Precondition: 0 <= b < bits_in_dword + +INT64 +__lshrdi3(INT64 a, INT32 b) +{ + const int bits_in_word = (int)(sizeof(INT32) * CHAR_BIT); + udwords input; + udwords result; + input.all = a; + if (b & bits_in_word) // bits_in_word <= b < bits_in_dword + { + result.high = 0; + result.low = input.high >> (b - bits_in_word); + } + else // 0 <= b < bits_in_word + { + if (b == 0) + return a; + result.high = input.high >> b; + result.low = (input.high << (bits_in_word - b)) | (input.low >> b); + } + return result.all; +} |