1*0a6a1f1dSLionel Sambuc /* ===-- fixdfti.c - Implement __fixdfti -----------------------------------=== 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 __fixdfti 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: convert a to a signed long long, rounding toward zero. */ 20*0a6a1f1dSLionel Sambuc 21*0a6a1f1dSLionel Sambuc /* Assumption: double is a IEEE 64 bit floating point type 22*0a6a1f1dSLionel Sambuc * su_int is a 32 bit integral type 23*0a6a1f1dSLionel Sambuc * value in double is representable in ti_int (no range checking performed) 24*0a6a1f1dSLionel Sambuc */ 25*0a6a1f1dSLionel Sambuc 26*0a6a1f1dSLionel Sambuc /* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ 27*0a6a1f1dSLionel Sambuc 28*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI ti_int __fixdfti(double a)29*0a6a1f1dSLionel Sambuc__fixdfti(double a) 30*0a6a1f1dSLionel Sambuc { 31*0a6a1f1dSLionel Sambuc double_bits fb; 32*0a6a1f1dSLionel Sambuc fb.f = a; 33*0a6a1f1dSLionel Sambuc int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; 34*0a6a1f1dSLionel Sambuc if (e < 0) 35*0a6a1f1dSLionel Sambuc return 0; 36*0a6a1f1dSLionel Sambuc ti_int s = (si_int)(fb.u.s.high & 0x80000000) >> 31; 37*0a6a1f1dSLionel Sambuc ti_int r = 0x0010000000000000uLL | (0x000FFFFFFFFFFFFFuLL & fb.u.all); 38*0a6a1f1dSLionel Sambuc if (e > 52) 39*0a6a1f1dSLionel Sambuc r <<= (e - 52); 40*0a6a1f1dSLionel Sambuc else 41*0a6a1f1dSLionel Sambuc r >>= (52 - e); 42*0a6a1f1dSLionel Sambuc return (r ^ s) - s; 43*0a6a1f1dSLionel Sambuc } 44*0a6a1f1dSLionel Sambuc 45*0a6a1f1dSLionel Sambuc #endif /* CRT_HAS_128BIT */ 46