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