1*0a6a1f1dSLionel Sambuc /* ===-- ashlti3.c - Implement __ashlti3 -----------------------------------=== 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 __ashlti3 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 #ifdef CRT_HAS_128BIT 18*0a6a1f1dSLionel Sambuc 19*0a6a1f1dSLionel Sambuc /* Returns: a << b */ 20*0a6a1f1dSLionel Sambuc 21*0a6a1f1dSLionel Sambuc /* Precondition: 0 <= b < bits_in_tword */ 22*0a6a1f1dSLionel Sambuc 23*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI ti_int __ashlti3(ti_int a,si_int b)24*0a6a1f1dSLionel Sambuc__ashlti3(ti_int a, si_int b) 25*0a6a1f1dSLionel Sambuc { 26*0a6a1f1dSLionel Sambuc const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT); 27*0a6a1f1dSLionel Sambuc twords input; 28*0a6a1f1dSLionel Sambuc twords result; 29*0a6a1f1dSLionel Sambuc input.all = a; 30*0a6a1f1dSLionel Sambuc if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ 31*0a6a1f1dSLionel Sambuc { 32*0a6a1f1dSLionel Sambuc result.s.low = 0; 33*0a6a1f1dSLionel Sambuc result.s.high = input.s.low << (b - bits_in_dword); 34*0a6a1f1dSLionel Sambuc } 35*0a6a1f1dSLionel Sambuc else /* 0 <= b < bits_in_dword */ 36*0a6a1f1dSLionel Sambuc { 37*0a6a1f1dSLionel Sambuc if (b == 0) 38*0a6a1f1dSLionel Sambuc return a; 39*0a6a1f1dSLionel Sambuc result.s.low = input.s.low << b; 40*0a6a1f1dSLionel Sambuc result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_dword - b)); 41*0a6a1f1dSLionel Sambuc } 42*0a6a1f1dSLionel Sambuc return result.all; 43*0a6a1f1dSLionel Sambuc } 44*0a6a1f1dSLionel Sambuc 45*0a6a1f1dSLionel Sambuc #endif /* CRT_HAS_128BIT */ 46