diff options
Diffstat (limited to 'lib/subvti3.c')
-rw-r--r-- | lib/subvti3.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/lib/subvti3.c b/lib/subvti3.c new file mode 100644 index 000000000..b130c8ceb --- /dev/null +++ b/lib/subvti3.c @@ -0,0 +1,40 @@ +//===-- subvti3.c - Implement __subvti3 -----------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __subvti3 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#if __x86_64 + +#include "int_lib.h" +#include <stdlib.h> + +// Returns: a - b + +// Effects: aborts if a - b overflows + +ti_int +__subvti3(ti_int a, ti_int b) +{ + ti_int s = a - b; + if (b >= 0) + { + if (s > a) + abort(); + } + else + { + if (s <= a) + abort(); + } + return s; +} + +#endif |