7686ff743c
This version of libcompiler_rt adds support for __mulo[sdt]i4(), which computes a multiply and its overflow flag. There are also a lot of cleanup fixes to headers that don't really affect us. Updating to this revision should make it a bit easier to contribute changes back to the LLVM developers.
30 lines
811 B
C
30 lines
811 B
C
/* ===-- absvsi2.c - Implement __absvsi2 -----------------------------------===
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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 __absvsi2 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: absolute value */
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/* Effects: aborts if abs(x) < 0 */
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COMPILER_RT_ABI si_int
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__absvsi2(si_int a)
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{
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const int N = (int)(sizeof(si_int) * CHAR_BIT);
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if (a == (1 << (N-1)))
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compilerrt_abort();
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const si_int t = a >> (N - 1);
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return (a ^ t) - t;
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}
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