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Diffstat (limited to 'compiler-rt/lib/builtins/fp_trunc.h')
-rw-r--r-- | compiler-rt/lib/builtins/fp_trunc.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/fp_trunc.h b/compiler-rt/lib/builtins/fp_trunc.h new file mode 100644 index 000000000000..aca4c9b6e677 --- /dev/null +++ b/compiler-rt/lib/builtins/fp_trunc.h @@ -0,0 +1,81 @@ +//=== lib/fp_trunc.h - high precision -> low 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 precision setting +// +//===----------------------------------------------------------------------===// + +#ifndef FP_TRUNC_HEADER +#define FP_TRUNC_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; + +#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; + +#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; + +#elif defined DST_HALF +typedef uint16_t dst_t; +typedef uint16_t dst_rep_t; +#define DST_REP_C UINT16_C +static const int dstSigBits = 10; + +#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 |