forked from OSchip/llvm-project
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
//=== lib/fp_trunc.h - high precision -> low 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 precision setting
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef FP_TRUNC_HEADER
|
|
#define FP_TRUNC_HEADER
|
|
|
|
#include "int_lib.h"
|
|
|
|
#if defined SRC_DOUBLE
|
|
typedef double src_t;
|
|
typedef uint64_t src_rep_t;
|
|
#define SRC_REP_C UINT64_C
|
|
static const int srcSigBits = 52;
|
|
|
|
#elif defined SRC_QUAD
|
|
typedef long double src_t;
|
|
typedef __uint128_t src_rep_t;
|
|
#define SRC_REP_C (__uint128_t)
|
|
static const int srcSigBits = 112;
|
|
|
|
#else
|
|
#error Source should be double precision or quad precision!
|
|
#endif //end source precision
|
|
|
|
#if 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_SINGLE
|
|
typedef float dst_t;
|
|
typedef uint32_t dst_rep_t;
|
|
#define DST_REP_C UINT32_C
|
|
static const int dstSigBits = 23;
|
|
|
|
#else
|
|
#error Destination should be single precision or double 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;
|
|
}
|
|
|
|
#endif // FP_TRUNC_HEADER
|