freebsd-dev/contrib/compiler-rt/lib/negvsi2.c
Ed Schouten 7686ff743c Upgrade libcompiler_rt to upstream revision 147390.
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.
2011-12-31 19:01:48 +00:00

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C

/* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
*
* 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 __negvsi2 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
/* Returns: -a */
/* Effects: aborts if -a overflows */
COMPILER_RT_ABI si_int
__negvsi2(si_int a)
{
const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
if (a == MIN)
compilerrt_abort();
return -a;
}