1 //===-lib/fp_extend.h - low precision -> high 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 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 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 #define src_rep_t_clz __builtin_clz 25 26 #elif defined SRC_DOUBLE 27 typedef double src_t; 28 typedef uint64_t src_rep_t; 29 #define SRC_REP_C UINT64_C 30 static const int srcSigBits = 52; src_rep_t_clz(src_rep_t a)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 #else 43 #error Source should be single precision or double precision! 44 #endif //end source precision 45 46 #if defined DST_DOUBLE 47 typedef double dst_t; 48 typedef uint64_t dst_rep_t; 49 #define DST_REP_C UINT64_C 50 static const int dstSigBits = 52; 51 52 #elif defined DST_QUAD 53 typedef long double dst_t; 54 typedef __uint128_t dst_rep_t; 55 #define DST_REP_C (__uint128_t) 56 static const int dstSigBits = 112; 57 58 #else 59 #error Destination should be double precision or quad precision! 60 #endif //end destination precision 61 62 // End of specialization parameters. Two helper routines for conversion to and 63 // from the representation of floating-point data as integer values follow. 64 srcToRep(src_t x)65static inline src_rep_t srcToRep(src_t x) { 66 const union { src_t f; src_rep_t i; } rep = {.f = x}; 67 return rep.i; 68 } 69 dstFromRep(dst_rep_t x)70static inline dst_t dstFromRep(dst_rep_t x) { 71 const union { dst_t f; dst_rep_t i; } rep = {.i = x}; 72 return rep.f; 73 } 74 // End helper routines. Conversion implementation follows. 75 76 #endif //FP_EXTEND_HEADER 77