27 lines
1004 B
C
27 lines
1004 B
C
//===-- moddi3.c - Implement __moddi3 -------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements __moddi3 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#include "int_lib.h"
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// Returns: a % b
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COMPILER_RT_ABI di_int __moddi3(di_int a, di_int b) {
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const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
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di_int s = b >> bits_in_dword_m1; // s = b < 0 ? -1 : 0
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b = (b ^ s) - s; // negate if s == -1
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s = a >> bits_in_dword_m1; // s = a < 0 ? -1 : 0
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a = (a ^ s) - s; // negate if s == -1
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du_int r;
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__udivmoddi4(a, b, &r);
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return ((di_int)r ^ s) - s; // negate if s == -1
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}
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