1//=== lib/fp_trunc.h - high precision -> low precision conversion *- C -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Set source and destination precision setting 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef FP_TRUNC_HEADER 15#define FP_TRUNC_HEADER 16 17#include "int_lib.h" 18 19#if defined SRC_SINGLE 20typedef float src_t; 21typedef uint32_t src_rep_t; 22#define SRC_REP_C UINT32_C 23static const int srcSigBits = 23; 24 25#elif defined SRC_DOUBLE 26typedef double src_t; 27typedef uint64_t src_rep_t; 28#define SRC_REP_C UINT64_C 29static const int srcSigBits = 52; 30 31#elif defined SRC_QUAD 32typedef long double src_t; 33typedef __uint128_t src_rep_t; 34#define SRC_REP_C (__uint128_t) 35static const int srcSigBits = 112; 36 37#else 38#error Source should be double precision or quad precision! 39#endif //end source precision 40 41#if defined DST_DOUBLE 42typedef double dst_t; 43typedef uint64_t dst_rep_t; 44#define DST_REP_C UINT64_C 45static const int dstSigBits = 52; 46 47#elif defined DST_SINGLE 48typedef float dst_t; 49typedef uint32_t dst_rep_t; 50#define DST_REP_C UINT32_C 51static const int dstSigBits = 23; 52 53#elif defined DST_HALF 54typedef uint16_t dst_t; 55typedef uint16_t dst_rep_t; 56#define DST_REP_C UINT16_C 57static const int dstSigBits = 10; 58 59#else 60#error Destination should be single precision or double precision! 61#endif //end destination precision 62 63// End of specialization parameters. Two helper routines for conversion to and 64// from the representation of floating-point data as integer values follow. 65 66static __inline src_rep_t srcToRep(src_t x) { 67 const union { src_t f; src_rep_t i; } rep = {.f = x}; 68 return rep.i; 69} 70 71static __inline dst_t dstFromRep(dst_rep_t x) { 72 const union { dst_t f; dst_rep_t i; } rep = {.i = x}; 73 return rep.f; 74} 75 76#endif // FP_TRUNC_HEADER 77