1//===-- lib/fixdfsi.c - Double-precision -> integer conversion ----*- C -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file implements float to unsigned integer conversion for the 10// compiler-rt library. 11// 12//===----------------------------------------------------------------------===// 13 14#include "fp_lib.h" 15 16static __inline fixuint_t __fixuint(fp_t a) { 17 // Break a into sign, exponent, significand parts. 18 const rep_t aRep = toRep(a); 19 const rep_t aAbs = aRep & absMask; 20 const int sign = aRep & signBit ? -1 : 1; 21 const int exponent = (aAbs >> significandBits) - exponentBias; 22 const rep_t significand = (aAbs & significandMask) | implicitBit; 23 24 // If either the value or the exponent is negative, the result is zero. 25 if (sign == -1 || exponent < 0) 26 return 0; 27 28 // If the value is too large for the integer type, saturate. 29 if ((unsigned)exponent >= sizeof(fixuint_t) * CHAR_BIT) 30 return ~(fixuint_t)0; 31 32 // If 0 <= exponent < significandBits, right shift to get the result. 33 // Otherwise, shift left. 34 if (exponent < significandBits) 35 return significand >> (significandBits - exponent); 36 else 37 return (fixuint_t)significand << (exponent - significandBits); 38} 39