26 lines
1.1 KiB
C
26 lines
1.1 KiB
C
//===-- divdi3.c - Implement __divdi3 -------------------------------------===//
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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 __divdi3 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 __divdi3(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_a = a >> bits_in_dword_m1; // s_a = a < 0 ? -1 : 0
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di_int s_b = b >> bits_in_dword_m1; // s_b = b < 0 ? -1 : 0
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a = (a ^ s_a) - s_a; // negate if s_a == -1
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b = (b ^ s_b) - s_b; // negate if s_b == -1
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s_a ^= s_b; // sign of quotient
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return (__udivmoddi4(a, b, (du_int *)0) ^ s_a) - s_a; // negate if s_a == -1
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}
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