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