1//===-lib/fp_extend.h - low precision -> high precision conversion -*- C 2//-*-===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9// 10// Set source and destination setting 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef FP_EXTEND_HEADER 15#define FP_EXTEND_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#define src_rep_t_clz clzsi 25 26#elif defined SRC_DOUBLE 27typedef double src_t; 28typedef uint64_t src_rep_t; 29#define SRC_REP_C UINT64_C 30static const int srcSigBits = 52; 31static __inline int src_rep_t_clz(src_rep_t a) { 32#if defined __LP64__ 33 return __builtin_clzl(a); 34#else 35 if (a & REP_C(0xffffffff00000000)) 36 return __builtin_clz(a >> 32); 37 else 38 return 32 + __builtin_clz(a & REP_C(0xffffffff)); 39#endif 40} 41 42#elif defined SRC_HALF 43typedef uint16_t src_t; 44typedef uint16_t src_rep_t; 45#define SRC_REP_C UINT16_C 46static const int srcSigBits = 10; 47#define src_rep_t_clz __builtin_clz 48 49#else 50#error Source should be half, single, or double precision! 51#endif // end source precision 52 53#if defined DST_SINGLE 54typedef float dst_t; 55typedef uint32_t dst_rep_t; 56#define DST_REP_C UINT32_C 57static const int dstSigBits = 23; 58 59#elif defined DST_DOUBLE 60typedef double dst_t; 61typedef uint64_t dst_rep_t; 62#define DST_REP_C UINT64_C 63static const int dstSigBits = 52; 64 65#elif defined DST_QUAD 66typedef long double dst_t; 67typedef __uint128_t dst_rep_t; 68#define DST_REP_C (__uint128_t) 69static const int dstSigBits = 112; 70 71#else 72#error Destination should be single, double, or quad precision! 73#endif // end destination precision 74 75// End of specialization parameters. Two helper routines for conversion to and 76// from the representation of floating-point data as integer values follow. 77 78static __inline src_rep_t srcToRep(src_t x) { 79 const union { 80 src_t f; 81 src_rep_t i; 82 } rep = {.f = x}; 83 return rep.i; 84} 85 86static __inline dst_t dstFromRep(dst_rep_t x) { 87 const union { 88 dst_t f; 89 dst_rep_t i; 90 } rep = {.i = x}; 91 return rep.f; 92} 93// End helper routines. Conversion implementation follows. 94 95#endif // FP_EXTEND_HEADER 96