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Diffstat (limited to 'lib/absvsi2.c')
-rw-r--r-- | lib/absvsi2.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/absvsi2.c b/lib/absvsi2.c new file mode 100644 index 000000000..5b28da089 --- /dev/null +++ b/lib/absvsi2.c @@ -0,0 +1,29 @@ +//===-- absvsi2.c - Implement __absvsi2 -----------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __absvsi2 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "int_lib.h" +#include <stdlib.h> + +// Returns: absolute value + +// Effects: aborts if abs(x) < 0 + +si_int +__absvsi2(si_int a) +{ + const int N = (int)(sizeof(si_int) * CHAR_BIT); + if (a == (1 << (N-1))) + abort(); + const si_int t = a >> (N - 1); + return (a ^ t) - t; +} |