38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
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/* clang-format off */
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/* ===-- modti3.c - Implement __modti3 -------------------------------------===
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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 __modti3 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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STATIC_YOINK("huge_compiler_rt_license");
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#include "third_party/compiler_rt/int_lib.h"
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#ifdef CRT_HAS_128BIT
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/*Returns: a % b */
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COMPILER_RT_ABI ti_int
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__modti3(ti_int a, ti_int b)
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{
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const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1;
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ti_int s = b >> bits_in_tword_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_tword_m1; /* s = a < 0 ? -1 : 0 */
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a = (a ^ s) - s; /* negate if s == -1 */
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tu_int r;
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__udivmodti4(a, b, &r);
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return ((ti_int)r ^ s) - s; /* negate if s == -1 */
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}
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#endif /* CRT_HAS_128BIT */
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