1*0a6a1f1dSLionel Sambuc /* ===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------=== 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 __fixunssfdi 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 /* Returns: convert a to a unsigned long long, rounding toward zero. 17*0a6a1f1dSLionel Sambuc * Negative values all become zero. 18*0a6a1f1dSLionel Sambuc */ 19*0a6a1f1dSLionel Sambuc 20*0a6a1f1dSLionel Sambuc /* Assumption: float is a IEEE 32 bit floating point type 21*0a6a1f1dSLionel Sambuc * du_int is a 64 bit integral type 22*0a6a1f1dSLionel Sambuc * value in float is representable in du_int or is negative 23*0a6a1f1dSLionel Sambuc * (no range checking performed) 24*0a6a1f1dSLionel Sambuc */ 25*0a6a1f1dSLionel Sambuc 26*0a6a1f1dSLionel Sambuc /* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 27*0a6a1f1dSLionel Sambuc ARM_EABI_FNALIAS(f2ulz,fixunssfdi)28*0a6a1f1dSLionel SambucARM_EABI_FNALIAS(f2ulz, fixunssfdi) 29*0a6a1f1dSLionel Sambuc 30*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI du_int 31*0a6a1f1dSLionel Sambuc __fixunssfdi(float a) 32*0a6a1f1dSLionel Sambuc { 33*0a6a1f1dSLionel Sambuc float_bits fb; 34*0a6a1f1dSLionel Sambuc fb.f = a; 35*0a6a1f1dSLionel Sambuc int e = ((fb.u & 0x7F800000) >> 23) - 127; 36*0a6a1f1dSLionel Sambuc if (e < 0 || (fb.u & 0x80000000)) 37*0a6a1f1dSLionel Sambuc return 0; 38*0a6a1f1dSLionel Sambuc du_int r = (fb.u & 0x007FFFFF) | 0x00800000; 39*0a6a1f1dSLionel Sambuc if (e > 23) 40*0a6a1f1dSLionel Sambuc r <<= (e - 23); 41*0a6a1f1dSLionel Sambuc else 42*0a6a1f1dSLionel Sambuc r >>= (23 - e); 43*0a6a1f1dSLionel Sambuc return r; 44*0a6a1f1dSLionel Sambuc } 45