forked from OSchip/llvm-project
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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//=== lib/fp_trunc.h - high precision -> low precision conversion *- C -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Set source and destination precision setting
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//
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//===----------------------------------------------------------------------===//
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#ifndef FP_TRUNC_HEADER
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#define FP_TRUNC_HEADER
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#include "int_lib.h"
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#if defined SRC_DOUBLE
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typedef double src_t;
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typedef uint64_t src_rep_t;
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#define SRC_REP_C UINT64_C
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static const int srcSigBits = 52;
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#elif defined SRC_QUAD
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typedef long double src_t;
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typedef __uint128_t src_rep_t;
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#define SRC_REP_C (__uint128_t)
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static const int srcSigBits = 112;
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#else
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#error Source should be double precision or quad precision!
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#endif //end source precision
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#if defined DST_DOUBLE
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typedef double dst_t;
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typedef uint64_t dst_rep_t;
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#define DST_REP_C UINT64_C
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static const int dstSigBits = 52;
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#elif defined DST_SINGLE
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typedef float dst_t;
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typedef uint32_t dst_rep_t;
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#define DST_REP_C UINT32_C
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static const int dstSigBits = 23;
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#else
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#error Destination should be single precision or double precision!
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#endif //end destination precision
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// End of specialization parameters. Two helper routines for conversion to and
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// from the representation of floating-point data as integer values follow.
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static inline src_rep_t srcToRep(src_t x) {
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const union { src_t f; src_rep_t i; } rep = {.f = x};
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return rep.i;
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}
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static inline dst_t dstFromRep(dst_rep_t x) {
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const union { dst_t f; dst_rep_t i; } rep = {.i = x};
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return rep.f;
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}
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#endif // FP_TRUNC_HEADER
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