diff options
Diffstat (limited to 'compiler-rt/lib/builtins/divdi3.c')
| -rw-r--r-- | compiler-rt/lib/builtins/divdi3.c | 38 |
1 files changed, 18 insertions, 20 deletions
diff --git a/compiler-rt/lib/builtins/divdi3.c b/compiler-rt/lib/builtins/divdi3.c index 0639c384094..ee08d655778 100644 --- a/compiler-rt/lib/builtins/divdi3.c +++ b/compiler-rt/lib/builtins/divdi3.c @@ -1,27 +1,25 @@ -/* ===-- divdi3.c - Implement __divdi3 -------------------------------------=== - * - * 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 __divdi3 for the compiler_rt library. - * - * ===----------------------------------------------------------------------=== - */ +//===-- divdi3.c - Implement __divdi3 -------------------------------------===// +// +// 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 __divdi3 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// #include "int_lib.h" -/* Returns: a / b */ +// Returns: a / b COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b) { const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; - di_int s_a = a >> bits_in_dword_m1; /* s_a = a < 0 ? -1 : 0 */ - di_int s_b = b >> bits_in_dword_m1; /* s_b = b < 0 ? -1 : 0 */ - a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ - b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ - s_a ^= s_b; /*sign of quotient */ - return (__udivmoddi4(a, b, (du_int *)0) ^ s_a) - - s_a; /* negate if s_a == -1 */ + di_int s_a = a >> bits_in_dword_m1; // s_a = a < 0 ? -1 : 0 + di_int s_b = b >> bits_in_dword_m1; // s_b = b < 0 ? -1 : 0 + a = (a ^ s_a) - s_a; // negate if s_a == -1 + b = (b ^ s_b) - s_b; // negate if s_b == -1 + s_a ^= s_b; // sign of quotient + return (__udivmoddi4(a, b, (du_int *)0) ^ s_a) - s_a; // negate if s_a == -1 } |
