diff options
Diffstat (limited to 'lib/builtins/ashrdi3.c')
-rw-r--r-- | lib/builtins/ashrdi3.c | 67 |
1 files changed, 30 insertions, 37 deletions
diff --git a/lib/builtins/ashrdi3.c b/lib/builtins/ashrdi3.c index 84619965e..b99391322 100644 --- a/lib/builtins/ashrdi3.c +++ b/lib/builtins/ashrdi3.c @@ -1,46 +1,39 @@ -/*===-- ashrdi3.c - Implement __ashrdi3 -----------------------------------=== - * - * The LLVM Compiler Infrastructure - * - * This file is dual licensed under the MIT and the University of Illinois Open - * Source Licenses. See LICENSE.TXT for details. - * - * ===----------------------------------------------------------------------=== - * - * This file implements __ashrdi3 for the compiler_rt library. - * - * ===----------------------------------------------------------------------=== - */ +//===-- ashrdi3.c - Implement __ashrdi3 -----------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This file implements __ashrdi3 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// #include "int_lib.h" -/* Returns: arithmetic a >> b */ +// Returns: arithmetic a >> b -/* Precondition: 0 <= b < bits_in_dword */ +// Precondition: 0 <= b < bits_in_dword -COMPILER_RT_ABI di_int -__ashrdi3(di_int a, si_int b) -{ - const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); - dwords input; - dwords result; - input.all = a; - if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ - { - /* result.s.high = input.s.high < 0 ? -1 : 0 */ - result.s.high = input.s.high >> (bits_in_word - 1); - result.s.low = input.s.high >> (b - bits_in_word); - } - else /* 0 <= b < bits_in_word */ - { - if (b == 0) - return a; - result.s.high = input.s.high >> b; - result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b); - } - return result.all; +COMPILER_RT_ABI di_int __ashrdi3(di_int a, si_int b) { + const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); + dwords input; + dwords result; + input.all = a; + if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ { + // result.s.high = input.s.high < 0 ? -1 : 0 + result.s.high = input.s.high >> (bits_in_word - 1); + result.s.low = input.s.high >> (b - bits_in_word); + } else /* 0 <= b < bits_in_word */ { + if (b == 0) + return a; + result.s.high = input.s.high >> b; + result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b); + } + return result.all; } #if defined(__ARM_EABI__) -AEABI_RTABI di_int __aeabi_lasr(di_int a, si_int b) COMPILER_RT_ALIAS(__ashrdi3); +COMPILER_RT_ALIAS(__ashrdi3, __aeabi_lasr) #endif |