| //===-lib/fp_extend.h - low precision -> high 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 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 clzsi |
| |
| #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 clzsi(a >> 32); |
| else |
| return 32 + clzsi(a & REP_C(0xffffffff)); |
| #endif |
| } |
| |
| #elif defined SRC_HALF |
| #ifdef CRT_HAS_FLOAT16 |
| typedef _Float16 src_t; |
| #else |
| typedef uint16_t src_t; |
| #endif |
| 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 |