90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
//===-lib/fp_extend.h - low precision -> high 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 setting
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//
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//===----------------------------------------------------------------------===//
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#ifndef FP_EXTEND_HEADER
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#define FP_EXTEND_HEADER
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#include "int_lib.h"
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#if defined SRC_SINGLE
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typedef float src_t;
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typedef uint32_t src_rep_t;
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#define SRC_REP_C UINT32_C
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static const int srcSigBits = 23;
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#define src_rep_t_clz __builtin_clz
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#elif 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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static __inline int src_rep_t_clz(src_rep_t a) {
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#if defined __LP64__
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return __builtin_clzl(a);
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#else
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if (a & REP_C(0xffffffff00000000))
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return __builtin_clz(a >> 32);
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else
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return 32 + __builtin_clz(a & REP_C(0xffffffff));
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#endif
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}
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#elif defined SRC_HALF
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typedef uint16_t src_t;
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typedef uint16_t src_rep_t;
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#define SRC_REP_C UINT16_C
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static const int srcSigBits = 10;
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#define src_rep_t_clz __builtin_clz
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#else
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#error Source should be half, single, or double precision!
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#endif //end source precision
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#if 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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#elif 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_QUAD
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typedef long double dst_t;
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typedef __uint128_t dst_rep_t;
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#define DST_REP_C (__uint128_t)
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static const int dstSigBits = 112;
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#else
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#error Destination should be single, double, or quad 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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// End helper routines. Conversion implementation follows.
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#endif //FP_EXTEND_HEADER
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