1*0a6a1f1dSLionel Sambuc /* ===-- fixunsdfdi.c - Implement __fixunsdfdi -----------------------------=== 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 __fixunsdfdi 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: convert a to a unsigned long long, rounding toward zero. 18*0a6a1f1dSLionel Sambuc * Negative values all become zero. 19*0a6a1f1dSLionel Sambuc */ 20*0a6a1f1dSLionel Sambuc 21*0a6a1f1dSLionel Sambuc /* Assumption: double is a IEEE 64 bit floating point type 22*0a6a1f1dSLionel Sambuc * du_int is a 64 bit integral type 23*0a6a1f1dSLionel Sambuc * value in double is representable in du_int or is negative 24*0a6a1f1dSLionel Sambuc * (no range checking performed) 25*0a6a1f1dSLionel Sambuc */ 26*0a6a1f1dSLionel Sambuc 27*0a6a1f1dSLionel Sambuc /* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ 28*0a6a1f1dSLionel Sambuc ARM_EABI_FNALIAS(d2ulz,fixunsdfdi)29*0a6a1f1dSLionel SambucARM_EABI_FNALIAS(d2ulz, fixunsdfdi) 30*0a6a1f1dSLionel Sambuc 31*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI du_int 32*0a6a1f1dSLionel Sambuc __fixunsdfdi(double a) 33*0a6a1f1dSLionel Sambuc { 34*0a6a1f1dSLionel Sambuc double_bits fb; 35*0a6a1f1dSLionel Sambuc fb.f = a; 36*0a6a1f1dSLionel Sambuc int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; 37*0a6a1f1dSLionel Sambuc if (e < 0 || (fb.u.s.high & 0x80000000)) 38*0a6a1f1dSLionel Sambuc return 0; 39*0a6a1f1dSLionel Sambuc udwords r; 40*0a6a1f1dSLionel Sambuc r.s.high = (fb.u.s.high & 0x000FFFFF) | 0x00100000; 41*0a6a1f1dSLionel Sambuc r.s.low = fb.u.s.low; 42*0a6a1f1dSLionel Sambuc if (e > 52) 43*0a6a1f1dSLionel Sambuc r.all <<= (e - 52); 44*0a6a1f1dSLionel Sambuc else 45*0a6a1f1dSLionel Sambuc r.all >>= (52 - e); 46*0a6a1f1dSLionel Sambuc return r.all; 47*0a6a1f1dSLionel Sambuc } 48