1 //=== lib/fp_trunc.h - high precision -> low precision conversion *- C -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // Set source and destination precision setting
11 //===----------------------------------------------------------------------===//
13 #ifndef FP_TRUNC_HEADER
14 #define FP_TRUNC_HEADER
18 #if defined SRC_SINGLE
20 typedef uint32_t src_rep_t;
21 #define SRC_REP_C UINT32_C
22 static const int srcSigBits = 23;
24 #elif defined SRC_DOUBLE
26 typedef uint64_t src_rep_t;
27 #define SRC_REP_C UINT64_C
28 static const int srcSigBits = 52;
30 #elif defined SRC_QUAD
31 typedef long double src_t;
32 typedef __uint128_t src_rep_t;
33 #define SRC_REP_C (__uint128_t)
34 static const int srcSigBits = 112;
37 #error Source should be double precision or quad precision!
38 #endif // end source precision
40 #if defined DST_DOUBLE
42 typedef uint64_t dst_rep_t;
43 #define DST_REP_C UINT64_C
44 static const int dstSigBits = 52;
46 #elif defined DST_SINGLE
48 typedef uint32_t dst_rep_t;
49 #define DST_REP_C UINT32_C
50 static const int dstSigBits = 23;
52 #elif defined DST_HALF
53 typedef uint16_t dst_t;
54 typedef uint16_t dst_rep_t;
55 #define DST_REP_C UINT16_C
56 static const int dstSigBits = 10;
59 #error Destination should be single precision or double precision!
60 #endif // end destination precision
62 // End of specialization parameters. Two helper routines for conversion to and
63 // from the representation of floating-point data as integer values follow.
65 static __inline src_rep_t srcToRep(src_t x) {
73 static __inline dst_t dstFromRep(dst_rep_t x) {
81 #endif // FP_TRUNC_HEADER