1//===-lib/fp_extend.h - low precision -> high 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 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 __builtin_clz
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#else
43#error Source should be single precision or double precision!
44#endif //end source precision
45
46#if defined DST_DOUBLE
47typedef double dst_t;
48typedef uint64_t dst_rep_t;
49#define DST_REP_C UINT64_C
50static const int dstSigBits = 52;
51
52#elif defined DST_QUAD
53typedef long double dst_t;
54typedef __uint128_t dst_rep_t;
55#define DST_REP_C (__uint128_t)
56static const int dstSigBits = 112;
57
58#else
59#error Destination should be double precision or quad 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 { src_t f; src_rep_t i; } rep = {.f = x};
67    return rep.i;
68}
69
70static inline dst_t dstFromRep(dst_rep_t x) {
71    const union { dst_t f; dst_rep_t i; } rep = {.i = x};
72    return rep.f;
73}
74// End helper routines.  Conversion implementation follows.
75
76#endif //FP_EXTEND_HEADER
77