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      1 /* ===-- int_lib.h - configuration header for compiler-rt  -----------------===
      2  *
      3  *                     The LLVM Compiler Infrastructure
      4  *
      5  * This file is dual licensed under the MIT and the University of Illinois Open
      6  * Source Licenses. See LICENSE.TXT for details.
      7  *
      8  * ===----------------------------------------------------------------------===
      9  *
     10  * This file is a configuration header for compiler-rt.
     11  * This file is not part of the interface of this library.
     12  *
     13  * ===----------------------------------------------------------------------===
     14  */
     15 
     16 #ifndef INT_LIB_H
     17 #define INT_LIB_H
     18 
     19 /* Assumption: Signed integral is 2's complement. */
     20 /* Assumption: Right shift of signed negative is arithmetic shift. */
     21 /* Assumption: Endianness is little or big (not mixed). */
     22 
     23 #if defined(__ELF__)
     24 #define FNALIAS(alias_name, original_name) \
     25   void alias_name() __attribute__((__alias__(#original_name)))
     26 #define COMPILER_RT_ALIAS(aliasee) __attribute__((__alias__(#aliasee)))
     27 #else
     28 #define FNALIAS(alias, name) _Pragma("GCC error(\"alias unsupported on this file format\")")
     29 #define COMPILER_RT_ALIAS(aliasee) _Pragma("GCC error(\"alias unsupported on this file format\")")
     30 #endif
     31 
     32 /* ABI macro definitions */
     33 
     34 #if __ARM_EABI__
     35 # ifdef COMPILER_RT_ARMHF_TARGET
     36 #   define COMPILER_RT_ABI
     37 # else
     38 #   define COMPILER_RT_ABI __attribute__((__pcs__("aapcs")))
     39 # endif
     40 #else
     41 # define COMPILER_RT_ABI
     42 #endif
     43 
     44 #define AEABI_RTABI __attribute__((__pcs__("aapcs")))
     45 
     46 #ifdef _MSC_VER
     47 #define ALWAYS_INLINE __forceinline
     48 #define NOINLINE __declspec(noinline)
     49 #define NORETURN __declspec(noreturn)
     50 #define UNUSED
     51 #else
     52 #define ALWAYS_INLINE __attribute__((always_inline))
     53 #define NOINLINE __attribute__((noinline))
     54 #define NORETURN __attribute__((noreturn))
     55 #define UNUSED __attribute__((unused))
     56 #endif
     57 
     58 #if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
     59 /*
     60  * Kernel and boot environment can't use normal headers,
     61  * so use the equivalent system headers.
     62  */
     63 #  include <machine/limits.h>
     64 #  include <sys/stdint.h>
     65 #  include <sys/types.h>
     66 #else
     67 /* Include the standard compiler builtin headers we use functionality from. */
     68 #  include <limits.h>
     69 #  include <stdint.h>
     70 #  include <stdbool.h>
     71 #  include <float.h>
     72 #endif
     73 
     74 /* Include the commonly used internal type definitions. */
     75 #include "int_types.h"
     76 
     77 /* Include internal utility function declarations. */
     78 #include "int_util.h"
     79 
     80 COMPILER_RT_ABI si_int __paritysi2(si_int a);
     81 COMPILER_RT_ABI si_int __paritydi2(di_int a);
     82 
     83 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
     84 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
     85 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
     86 
     87 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
     88 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
     89 #ifdef CRT_HAS_128BIT
     90 COMPILER_RT_ABI si_int __clzti2(ti_int a);
     91 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
     92 #endif
     93 
     94 /* Definitions for builtins unavailable on MSVC */
     95 #if defined(_MSC_VER) && !defined(__clang__)
     96 #include <intrin.h>
     97 
     98 uint32_t __inline __builtin_ctz(uint32_t value) {
     99   uint32_t trailing_zero = 0;
    100   if (_BitScanForward(&trailing_zero, value))
    101     return trailing_zero;
    102   return 32;
    103 }
    104 
    105 uint32_t __inline __builtin_clz(uint32_t value) {
    106   uint32_t leading_zero = 0;
    107   if (_BitScanReverse(&leading_zero, value))
    108     return 31 - leading_zero;
    109   return 32;
    110 }
    111 
    112 #if defined(_M_ARM) || defined(_M_X64)
    113 uint32_t __inline __builtin_clzll(uint64_t value) {
    114   uint32_t leading_zero = 0;
    115   if (_BitScanReverse64(&leading_zero, value))
    116     return 63 - leading_zero;
    117   return 64;
    118 }
    119 #else
    120 uint32_t __inline __builtin_clzll(uint64_t value) {
    121   if (value == 0)
    122     return 64;
    123   uint32_t msh = (uint32_t)(value >> 32);
    124   uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
    125   if (msh != 0)
    126     return __builtin_clz(msh);
    127   return 32 + __builtin_clz(lsh);
    128 }
    129 #endif
    130 
    131 #define __builtin_clzl __builtin_clzll
    132 #endif /* defined(_MSC_VER) && !defined(__clang__) */
    133 
    134 #endif /* INT_LIB_H */
    135