1 /* ===-- subvti3.c - Implement __subvti3 -----------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __subvti3 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 17 #if __x86_64 18 19 /* Returns: a - b */ 20 21 /* Effects: aborts if a - b overflows */ 22 23 ti_int 24 __subvti3(ti_int a, ti_int b) 25 { 26 ti_int s = a - b; 27 if (b >= 0) 28 { 29 if (s > a) 30 compilerrt_abort(); 31 } 32 else 33 { 34 if (s <= a) 35 compilerrt_abort(); 36 } 37 return s; 38 } 39 40 #endif /* __x86_64 */ 41
