compiler-rt/lib/builtins/int_to_fp.h

   1 //===-- int_to_fp.h - integer to floating point conversion ----------------===//
   2 //
   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
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Set source and destination defines in order to use a correctly
  10 // parameterised floatXiYf implementation.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef INT_TO_FP_H
  15 #define INT_TO_FP_H
  16
  17 #include "int_lib.h"
  18
  19 #if defined SRC_I64
  20 typedef int64_t src_t;
  21 typedef uint64_t usrc_t;
  22 static __inline int clzSrcT(usrc_t x) { return __builtin_clzll(x); }
  23
  24 #elif defined SRC_U64
  25 typedef uint64_t src_t;
  26 typedef uint64_t usrc_t;
  27 static __inline int clzSrcT(usrc_t x) { return __builtin_clzll(x); }
  28
  29 #elif defined SRC_I128
  30 typedef __int128_t src_t;
  31 typedef __uint128_t usrc_t;
  32 static __inline int clzSrcT(usrc_t x) { return __clzti2(x); }
  33
  34 #elif defined SRC_U128
  35 typedef __uint128_t src_t;
  36 typedef __uint128_t usrc_t;
  37 static __inline int clzSrcT(usrc_t x) { return __clzti2(x); }
  38
  39 #else
  40 #error Source should be a handled integer type.
  41 #endif
  42
  43 #if defined DST_SINGLE
  44 typedef float dst_t;
  45 typedef uint32_t dst_rep_t;
  46 #define DST_REP_C UINT32_C
  47
  48 enum {
  49   dstSigBits = 23,
  50 };
  51
  52 #elif defined DST_DOUBLE
  53 typedef double dst_t;
  54 typedef uint64_t dst_rep_t;
  55 #define DST_REP_C UINT64_C
  56
  57 enum {
  58   dstSigBits = 52,
  59 };
  60
  61 #elif defined DST_QUAD
  62 typedef tf_float dst_t;
  63 typedef __uint128_t dst_rep_t;
  64 #define DST_REP_C (__uint128_t)
  65
  66 enum {
  67   dstSigBits = 112,
  68 };
  69
  70 #else
  71 #error Destination should be a handled floating point type
  72 #endif
  73
  74 static __inline dst_t dstFromRep(dst_rep_t x) {
  75   const union {
  76     dst_t f;
  77     dst_rep_t i;
  78   } rep = {.i = x};
  79   return rep.f;
  80 }
  81
  82 #endif // INT_TO_FP_H