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Justine Tunney 2020-06-15 07:18:57 -07:00
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37
third_party/compiler_rt/absvti2.c vendored Normal file
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/* clang-format off */
/* ===-- absvti2.c - Implement __absvdi2 -----------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __absvti2 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
STATIC_YOINK("huge_compiler_rt_license");
#include "third_party/compiler_rt/int_lib.h"
#ifdef CRT_HAS_128BIT
/* Returns: absolute value */
/* Effects: aborts if abs(x) < 0 */
COMPILER_RT_ABI ti_int
__absvti2(ti_int a)
{
const int N = (int)(sizeof(ti_int) * CHAR_BIT);
if (a == ((ti_int)1 << (N-1)))
compilerrt_abort();
const ti_int s = a >> (N - 1);
return (a ^ s) - s;
}
#endif /* CRT_HAS_128BIT */