1*0a6a1f1dSLionel Sambuc /* ===-- absvsi2.c - Implement __absvsi2 -----------------------------------=== 2*0a6a1f1dSLionel Sambuc * 3*0a6a1f1dSLionel Sambuc * The LLVM Compiler Infrastructure 4*0a6a1f1dSLionel Sambuc * 5*0a6a1f1dSLionel Sambuc * This file is dual licensed under the MIT and the University of Illinois Open 6*0a6a1f1dSLionel Sambuc * Source Licenses. See LICENSE.TXT for details. 7*0a6a1f1dSLionel Sambuc * 8*0a6a1f1dSLionel Sambuc * ===----------------------------------------------------------------------=== 9*0a6a1f1dSLionel Sambuc * 10*0a6a1f1dSLionel Sambuc * This file implements __absvsi2 for the compiler_rt library. 11*0a6a1f1dSLionel Sambuc * 12*0a6a1f1dSLionel Sambuc * ===----------------------------------------------------------------------=== 13*0a6a1f1dSLionel Sambuc */ 14*0a6a1f1dSLionel Sambuc 15*0a6a1f1dSLionel Sambuc #include "int_lib.h" 16*0a6a1f1dSLionel Sambuc 17*0a6a1f1dSLionel Sambuc /* Returns: absolute value */ 18*0a6a1f1dSLionel Sambuc 19*0a6a1f1dSLionel Sambuc /* Effects: aborts if abs(x) < 0 */ 20*0a6a1f1dSLionel Sambuc 21*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI si_int __absvsi2(si_int a)22*0a6a1f1dSLionel Sambuc__absvsi2(si_int a) 23*0a6a1f1dSLionel Sambuc { 24*0a6a1f1dSLionel Sambuc const int N = (int)(sizeof(si_int) * CHAR_BIT); 25*0a6a1f1dSLionel Sambuc if (a == (1 << (N-1))) 26*0a6a1f1dSLionel Sambuc compilerrt_abort(); 27*0a6a1f1dSLionel Sambuc const si_int t = a >> (N - 1); 28*0a6a1f1dSLionel Sambuc return (a ^ t) - t; 29*0a6a1f1dSLionel Sambuc } 30