1*7c3d14c8STreehugger Robot /* ===-- divti3.c - Implement __divti3 -------------------------------------=== 2*7c3d14c8STreehugger Robot * 3*7c3d14c8STreehugger Robot * The LLVM Compiler Infrastructure 4*7c3d14c8STreehugger Robot * 5*7c3d14c8STreehugger Robot * This file is dual licensed under the MIT and the University of Illinois Open 6*7c3d14c8STreehugger Robot * Source Licenses. See LICENSE.TXT for details. 7*7c3d14c8STreehugger Robot * 8*7c3d14c8STreehugger Robot * ===----------------------------------------------------------------------=== 9*7c3d14c8STreehugger Robot * 10*7c3d14c8STreehugger Robot * This file implements __divti3 for the compiler_rt library. 11*7c3d14c8STreehugger Robot * 12*7c3d14c8STreehugger Robot * ===----------------------------------------------------------------------=== 13*7c3d14c8STreehugger Robot */ 14*7c3d14c8STreehugger Robot 15*7c3d14c8STreehugger Robot #include "int_lib.h" 16*7c3d14c8STreehugger Robot 17*7c3d14c8STreehugger Robot #ifdef CRT_HAS_128BIT 18*7c3d14c8STreehugger Robot 19*7c3d14c8STreehugger Robot /* Returns: a / b */ 20*7c3d14c8STreehugger Robot 21*7c3d14c8STreehugger Robot COMPILER_RT_ABI ti_int __divti3(ti_int a,ti_int b)22*7c3d14c8STreehugger Robot__divti3(ti_int a, ti_int b) 23*7c3d14c8STreehugger Robot { 24*7c3d14c8STreehugger Robot const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; 25*7c3d14c8STreehugger Robot ti_int s_a = a >> bits_in_tword_m1; /* s_a = a < 0 ? -1 : 0 */ 26*7c3d14c8STreehugger Robot ti_int s_b = b >> bits_in_tword_m1; /* s_b = b < 0 ? -1 : 0 */ 27*7c3d14c8STreehugger Robot a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ 28*7c3d14c8STreehugger Robot b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ 29*7c3d14c8STreehugger Robot s_a ^= s_b; /* sign of quotient */ 30*7c3d14c8STreehugger Robot return (__udivmodti4(a, b, (tu_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */ 31*7c3d14c8STreehugger Robot } 32*7c3d14c8STreehugger Robot 33*7c3d14c8STreehugger Robot #endif /* CRT_HAS_128BIT */ 34