1250003Sadrian/* ===-- subvsi3.c - Implement __subvsi3 -----------------------------------=== 2250003Sadrian * 3250003Sadrian * The LLVM Compiler Infrastructure 4250003Sadrian * 5250003Sadrian * This file is dual licensed under the MIT and the University of Illinois Open 6250003Sadrian * Source Licenses. See LICENSE.TXT for details. 7250003Sadrian * 8250003Sadrian * ===----------------------------------------------------------------------=== 9250003Sadrian * 10250003Sadrian * This file implements __subvsi3 for the compiler_rt library. 11250003Sadrian * 12250003Sadrian * ===----------------------------------------------------------------------=== 13250003Sadrian */ 14250003Sadrian 15250003Sadrian#include "int_lib.h" 16250003Sadrian 17250003Sadrian/* Returns: a - b */ 18250003Sadrian 19250003Sadrian/* Effects: aborts if a - b overflows */ 20250003Sadrian 21250003SadrianCOMPILER_RT_ABI si_int 22250003Sadrian__subvsi3(si_int a, si_int b) 23250003Sadrian{ 24250003Sadrian si_int s = (su_int) a - (su_int) b; 25250003Sadrian if (b >= 0) 26250003Sadrian { 27250003Sadrian if (s > a) 28250003Sadrian compilerrt_abort(); 29250003Sadrian } 30250003Sadrian else 31250003Sadrian { 32250003Sadrian if (s <= a) 33250003Sadrian compilerrt_abort(); 34250003Sadrian } 35250003Sadrian return s; 36250003Sadrian} 37250003Sadrian