1 //=== lib/fp_trunc.h - high precision -> low precision conversion *- C -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Set source and destination precision setting
12 //===----------------------------------------------------------------------===//
14 #ifndef FP_TRUNC_HEADER
15 #define FP_TRUNC_HEADER
19 #if defined SRC_SINGLE
21 typedef uint32_t src_rep_t;
22 #define SRC_REP_C UINT32_C
23 static const int srcSigBits = 23;
25 #elif defined SRC_DOUBLE
27 typedef uint64_t src_rep_t;
28 #define SRC_REP_C UINT64_C
29 static const int srcSigBits = 52;
31 #elif defined SRC_QUAD
32 typedef long double src_t;
33 typedef __uint128_t src_rep_t;
34 #define SRC_REP_C (__uint128_t)
35 static const int srcSigBits = 112;
38 #error Source should be double precision or quad precision!
39 #endif //end source precision
41 #if defined DST_DOUBLE
43 typedef uint64_t dst_rep_t;
44 #define DST_REP_C UINT64_C
45 static const int dstSigBits = 52;
47 #elif defined DST_SINGLE
49 typedef uint32_t dst_rep_t;
50 #define DST_REP_C UINT32_C
51 static const int dstSigBits = 23;
53 #elif defined DST_HALF
54 typedef uint16_t dst_t;
55 typedef uint16_t dst_rep_t;
56 #define DST_REP_C UINT16_C
57 static const int dstSigBits = 10;
60 #error Destination should be single precision or double precision!
61 #endif //end destination precision
63 // End of specialization parameters. Two helper routines for conversion to and
64 // from the representation of floating-point data as integer values follow.
66 static __inline src_rep_t srcToRep(src_t x) {
67 const union { src_t f; src_rep_t i; } rep = {.f = x};
71 static __inline dst_t dstFromRep(dst_rep_t x) {
72 const union { dst_t f; dst_rep_t i; } rep = {.i = x};
76 #endif // FP_TRUNC_HEADER