1190e92d8Sjoerg //=== lib/fp_trunc.h - high precision -> low precision conversion *- C -*-===// 2190e92d8Sjoerg // 3190e92d8Sjoerg // The LLVM Compiler Infrastructure 4190e92d8Sjoerg // 5190e92d8Sjoerg // This file is dual licensed under the MIT and the University of Illinois Open 6190e92d8Sjoerg // Source Licenses. See LICENSE.TXT for details. 7190e92d8Sjoerg // 8190e92d8Sjoerg //===----------------------------------------------------------------------===// 9190e92d8Sjoerg // 10190e92d8Sjoerg // Set source and destination precision setting 11190e92d8Sjoerg // 12190e92d8Sjoerg //===----------------------------------------------------------------------===// 13190e92d8Sjoerg 14190e92d8Sjoerg #ifndef FP_TRUNC_HEADER 15190e92d8Sjoerg #define FP_TRUNC_HEADER 16190e92d8Sjoerg 17190e92d8Sjoerg #include "int_lib.h" 18190e92d8Sjoerg 19*ef84fd3bSjoerg #if defined SRC_SINGLE 20*ef84fd3bSjoerg typedef float src_t; 21*ef84fd3bSjoerg typedef uint32_t src_rep_t; 22*ef84fd3bSjoerg #define SRC_REP_C UINT32_C 23*ef84fd3bSjoerg static const int srcSigBits = 23; 24*ef84fd3bSjoerg 25*ef84fd3bSjoerg #elif defined SRC_DOUBLE 26190e92d8Sjoerg typedef double src_t; 27190e92d8Sjoerg typedef uint64_t src_rep_t; 28190e92d8Sjoerg #define SRC_REP_C UINT64_C 29190e92d8Sjoerg static const int srcSigBits = 52; 30190e92d8Sjoerg 31190e92d8Sjoerg #elif defined SRC_QUAD 32190e92d8Sjoerg typedef long double src_t; 33190e92d8Sjoerg typedef __uint128_t src_rep_t; 34190e92d8Sjoerg #define SRC_REP_C (__uint128_t) 35190e92d8Sjoerg static const int srcSigBits = 112; 36190e92d8Sjoerg 37190e92d8Sjoerg #else 38190e92d8Sjoerg #error Source should be double precision or quad precision! 39190e92d8Sjoerg #endif //end source precision 40190e92d8Sjoerg 41190e92d8Sjoerg #if defined DST_DOUBLE 42190e92d8Sjoerg typedef double dst_t; 43190e92d8Sjoerg typedef uint64_t dst_rep_t; 44190e92d8Sjoerg #define DST_REP_C UINT64_C 45190e92d8Sjoerg static const int dstSigBits = 52; 46190e92d8Sjoerg 47190e92d8Sjoerg #elif defined DST_SINGLE 48190e92d8Sjoerg typedef float dst_t; 49190e92d8Sjoerg typedef uint32_t dst_rep_t; 50190e92d8Sjoerg #define DST_REP_C UINT32_C 51190e92d8Sjoerg static const int dstSigBits = 23; 52190e92d8Sjoerg 53*ef84fd3bSjoerg #elif defined DST_HALF 54*ef84fd3bSjoerg typedef uint16_t dst_t; 55*ef84fd3bSjoerg typedef uint16_t dst_rep_t; 56*ef84fd3bSjoerg #define DST_REP_C UINT16_C 57*ef84fd3bSjoerg static const int dstSigBits = 10; 58*ef84fd3bSjoerg 59190e92d8Sjoerg #else 60190e92d8Sjoerg #error Destination should be single precision or double precision! 61190e92d8Sjoerg #endif //end destination precision 62190e92d8Sjoerg 63190e92d8Sjoerg // End of specialization parameters. Two helper routines for conversion to and 64190e92d8Sjoerg // from the representation of floating-point data as integer values follow. 65190e92d8Sjoerg srcToRep(src_t x)66*ef84fd3bSjoergstatic __inline src_rep_t srcToRep(src_t x) { 67190e92d8Sjoerg const union { src_t f; src_rep_t i; } rep = {.f = x}; 68190e92d8Sjoerg return rep.i; 69190e92d8Sjoerg } 70190e92d8Sjoerg dstFromRep(dst_rep_t x)71*ef84fd3bSjoergstatic __inline dst_t dstFromRep(dst_rep_t x) { 72190e92d8Sjoerg const union { dst_t f; dst_rep_t i; } rep = {.i = x}; 73190e92d8Sjoerg return rep.f; 74190e92d8Sjoerg } 75190e92d8Sjoerg 76190e92d8Sjoerg #endif // FP_TRUNC_HEADER 77