compiler-rt/lib/builtins/fp_extend.h

//===-lib/fp_extend.h - low precision -> high precision conversion -*- C
//-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Set source and destination setting
//
//===----------------------------------------------------------------------===//

#ifndef FP_EXTEND_HEADER
#define FP_EXTEND_HEADER

#include "int_lib.h"

#if defined SRC_SINGLE
typedef float src_t;
typedef uint32_t src_rep_t;
#define SRC_REP_C UINT32_C
static const int srcSigBits = 23;
#define src_rep_t_clz clzsi

#elif defined SRC_DOUBLE
typedef double src_t;
typedef uint64_t src_rep_t;
#define SRC_REP_C UINT64_C
static const int srcSigBits = 52;
static __inline int src_rep_t_clz(src_rep_t a) {
#if defined __LP64__
  return __builtin_clzl(a);
#else
  if (a & REP_C(0xffffffff00000000))
    return __builtin_clz(a >> 32);
  else
    return 32 + __builtin_clz(a & REP_C(0xffffffff));
#endif
}

#elif defined SRC_HALF
typedef uint16_t src_t;
typedef uint16_t src_rep_t;
#define SRC_REP_C UINT16_C
static const int srcSigBits = 10;
#define src_rep_t_clz __builtin_clz

#else
#error Source should be half, single, or double precision!
#endif // end source precision

#if defined DST_SINGLE
typedef float dst_t;
typedef uint32_t dst_rep_t;
#define DST_REP_C UINT32_C
static const int dstSigBits = 23;

#elif defined DST_DOUBLE
typedef double dst_t;
typedef uint64_t dst_rep_t;
#define DST_REP_C UINT64_C
static const int dstSigBits = 52;

#elif defined DST_QUAD
typedef long double dst_t;
typedef __uint128_t dst_rep_t;
#define DST_REP_C (__uint128_t)
static const int dstSigBits = 112;

#else
#error Destination should be single, double, or quad precision!
#endif // end destination precision

// End of specialization parameters.  Two helper routines for conversion to and
// from the representation of floating-point data as integer values follow.

static __inline src_rep_t srcToRep(src_t x) {
  const union {
    src_t f;
    src_rep_t i;
  } rep = {.f = x};
  return rep.i;
}

static __inline dst_t dstFromRep(dst_rep_t x) {
  const union {
    dst_t f;
    dst_rep_t i;
  } rep = {.i = x};
  return rep.f;
}
// End helper routines.  Conversion implementation follows.

#endif // FP_EXTEND_HEADER