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/*===-- moddi3.c - Implement __moddi3 -------------------------------------=== |
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* |
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* The LLVM Compiler Infrastructure |
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* |
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* This file is dual licensed under the MIT and the University of Illinois Open |
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* Source Licenses. See LICENSE.TXT for details. |
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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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*/ |
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#include "int_lib.h" |
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/* Returns: a % b */ |
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COMPILER_RT_ABI di_int |
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__moddi3(di_int a, di_int b) |
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{ |
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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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} |