1//=== lib/fp_trunc.h - high precision -> low precision 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// Set source and destination precision setting
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef FP_TRUNC_HEADER
14#define FP_TRUNC_HEADER
15
16#include "int_lib.h"
17
18#if defined SRC_SINGLE
19typedef float src_t;
20typedef uint32_t src_rep_t;
21#define SRC_REP_C UINT32_C
22static const int srcSigBits = 23;
23
24#elif defined SRC_DOUBLE
25typedef double src_t;
26typedef uint64_t src_rep_t;
27#define SRC_REP_C UINT64_C
28static const int srcSigBits = 52;
29
30#elif defined SRC_QUAD
31typedef long double src_t;
32typedef __uint128_t src_rep_t;
33#define SRC_REP_C (__uint128_t)
34static const int srcSigBits = 112;
35
36#else
37#error Source should be double precision or quad precision!
38#endif // end source precision
39
40#if defined DST_DOUBLE
41typedef double dst_t;
42typedef uint64_t dst_rep_t;
43#define DST_REP_C UINT64_C
44static const int dstSigBits = 52;
45
46#elif defined DST_SINGLE
47typedef float dst_t;
48typedef uint32_t dst_rep_t;
49#define DST_REP_C UINT32_C
50static const int dstSigBits = 23;
51
52#elif defined DST_HALF
53typedef uint16_t dst_t;
54typedef uint16_t dst_rep_t;
55#define DST_REP_C UINT16_C
56static const int dstSigBits = 10;
57
58#else
59#error Destination should be single precision or double precision!
60#endif // end destination precision
61
62// End of specialization parameters.  Two helper routines for conversion to and
63// from the representation of floating-point data as integer values follow.
64
65static __inline src_rep_t srcToRep(src_t x) {
66  const union {
67    src_t f;
68    src_rep_t i;
69  } rep = {.f = x};
70  return rep.i;
71}
72
73static __inline dst_t dstFromRep(dst_rep_t x) {
74  const union {
75    dst_t f;
76    dst_rep_t i;
77  } rep = {.i = x};
78  return rep.f;
79}
80
81#endif // FP_TRUNC_HEADER
82