Stephen Hines | 6a211c5 | 2014-07-21 00:49:56 -0700 | [diff] [blame] | 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 | |
Pirama Arumuga Nainar | a4cf3ee | 2015-05-20 13:03:23 -0700 | [diff] [blame] | 19 | #if defined SRC_SINGLE |
| 20 | typedef float src_t; |
| 21 | typedef uint32_t src_rep_t; |
| 22 | #define SRC_REP_C UINT32_C |
| 23 | static const int srcSigBits = 23; |
| 24 | |
| 25 | #elif defined SRC_DOUBLE |
Stephen Hines | 6a211c5 | 2014-07-21 00:49:56 -0700 | [diff] [blame] | 26 | typedef double src_t; |
| 27 | typedef uint64_t src_rep_t; |
| 28 | #define SRC_REP_C UINT64_C |
| 29 | static const int srcSigBits = 52; |
| 30 | |
| 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; |
| 36 | |
| 37 | #else |
| 38 | #error Source should be double precision or quad precision! |
| 39 | #endif //end source precision |
| 40 | |
| 41 | #if defined DST_DOUBLE |
| 42 | typedef double dst_t; |
| 43 | typedef uint64_t dst_rep_t; |
| 44 | #define DST_REP_C UINT64_C |
| 45 | static const int dstSigBits = 52; |
| 46 | |
| 47 | #elif defined DST_SINGLE |
| 48 | typedef float dst_t; |
| 49 | typedef uint32_t dst_rep_t; |
| 50 | #define DST_REP_C UINT32_C |
| 51 | static const int dstSigBits = 23; |
| 52 | |
Pirama Arumuga Nainar | a4cf3ee | 2015-05-20 13:03:23 -0700 | [diff] [blame] | 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; |
| 58 | |
Stephen Hines | 6a211c5 | 2014-07-21 00:49:56 -0700 | [diff] [blame] | 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 | |
| 66 | static 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 | |
| 71 | static 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 |