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//===-lib/fp_extend.h - low precision -> high precision conversion -*- C -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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 __builtin_clz
#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
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