diff options
Diffstat (limited to 'lib/negvti2.c')
-rw-r--r-- | lib/negvti2.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/lib/negvti2.c b/lib/negvti2.c new file mode 100644 index 000000000..ced05e885 --- /dev/null +++ b/lib/negvti2.c @@ -0,0 +1,32 @@ +//===-- negvti2.c - Implement __negvti2 -----------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __negvti2 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#if __x86_64 + +#include "int_lib.h" +#include <stdlib.h> + +// Returns: -a + +// Effects: aborts if -a overflows + +ti_int +__negvti2(ti_int a) +{ + const ti_int MIN = (ti_int)1 << ((int)(sizeof(ti_int) * CHAR_BIT)-1); + if (a == MIN) + abort(); + return -a; +} + +#endif |