1*0a6a1f1dSLionel Sambuc /* ===-- fixxfti.c - Implement __fixxfti -----------------------------------=== 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 __fixxfti 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: long double is an intel 80 bit floating point type padded with 6 bytes 22*0a6a1f1dSLionel Sambuc * su_int is a 32 bit integral type 23*0a6a1f1dSLionel Sambuc * value in long double is representable in ti_int (no range checking performed) 24*0a6a1f1dSLionel Sambuc */ 25*0a6a1f1dSLionel Sambuc 26*0a6a1f1dSLionel Sambuc /* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | 27*0a6a1f1dSLionel Sambuc * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm 28*0a6a1f1dSLionel Sambuc */ 29*0a6a1f1dSLionel Sambuc 30*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI ti_int __fixxfti(long double a)31*0a6a1f1dSLionel Sambuc__fixxfti(long double a) 32*0a6a1f1dSLionel Sambuc { 33*0a6a1f1dSLionel Sambuc long_double_bits fb; 34*0a6a1f1dSLionel Sambuc fb.f = a; 35*0a6a1f1dSLionel Sambuc int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 36*0a6a1f1dSLionel Sambuc if (e < 0) 37*0a6a1f1dSLionel Sambuc return 0; 38*0a6a1f1dSLionel Sambuc ti_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15); 39*0a6a1f1dSLionel Sambuc ti_int r = fb.u.low.all; 40*0a6a1f1dSLionel Sambuc if (e > 63) 41*0a6a1f1dSLionel Sambuc r <<= (e - 63); 42*0a6a1f1dSLionel Sambuc else 43*0a6a1f1dSLionel Sambuc r >>= (63 - e); 44*0a6a1f1dSLionel Sambuc return (r ^ s) - s; 45*0a6a1f1dSLionel Sambuc } 46*0a6a1f1dSLionel Sambuc 47*0a6a1f1dSLionel Sambuc #endif /* CRT_HAS_128BIT */ 48