src/compiler-rt/lib/builtins/int_lib.h

   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 #else
  27 #define FNALIAS(alias, name) _Pragma("GCC error(\"alias unsupported on this file format\")")
  28 #endif
  29
  30 /* ABI macro definitions */
  31
  32 #if __ARM_EABI__
  33 # define ARM_EABI_FNALIAS(aeabi_name, name)         \
  34   void __aeabi_##aeabi_name() __attribute__((alias("__" #name)));
  35 # define COMPILER_RT_ABI __attribute__((pcs("aapcs")))
  36 #else
  37 # define ARM_EABI_FNALIAS(aeabi_name, name)
  38 # define COMPILER_RT_ABI
  39 #endif
  40
  41 #ifdef _MSC_VER
  42 #define ALWAYS_INLINE __forceinline
  43 #define NOINLINE __declspec(noinline)
  44 #define NORETURN __declspec(noreturn)
  45 #define UNUSED
  46 #else
  47 #define ALWAYS_INLINE __attribute__((always_inline))
  48 #define NOINLINE __attribute__((noinline))
  49 #define NORETURN __attribute__((noreturn))
  50 #define UNUSED __attribute__((unused))
  51 #endif
  52
  53 #if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
  54 /*
  55  * Kernel and boot environment can't use normal headers,
  56  * so use the equivalent system headers.
  57  */
  58 #  include <machine/limits.h>
  59 #  include <sys/stdint.h>
  60 #  include <sys/types.h>
  61 #else
  62 /* Include the standard compiler builtin headers we use functionality from. */
  63 #  include <limits.h>
  64 #  include <stdint.h>
  65 #  include <stdbool.h>
  66 #  include <float.h>
  67 #endif
  68
  69 /* Include the commonly used internal type definitions. */
  70 #include "int_types.h"
  71
  72 /* Include internal utility function declarations. */
  73 #include "int_util.h"
  74
  75 COMPILER_RT_ABI si_int __paritysi2(si_int a);
  76 COMPILER_RT_ABI si_int __paritydi2(di_int a);
  77
  78 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
  79 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
  80 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
  81
  82 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
  83 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
  84 #ifdef CRT_HAS_128BIT
  85 COMPILER_RT_ABI si_int __clzti2(ti_int a);
  86 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
  87 #endif
  88
  89 /* Definitions for builtins unavailable on MSVC */
  90 #if defined(_MSC_VER) && !defined(__clang__)
  91 #include <intrin.h>
  92
  93 uint32_t __inline __builtin_ctz(uint32_t value) {
  94   uint32_t trailing_zero = 0;
  95   if (_BitScanForward(&trailing_zero, value))
  96     return trailing_zero;
  97   return 32;
  98 }
  99
 100 uint32_t __inline __builtin_clz(uint32_t value) {
 101   uint32_t leading_zero = 0;
 102   if (_BitScanReverse(&leading_zero, value))
 103     return 31 - leading_zero;
 104   return 32;
 105 }
 106
 107 #if defined(_M_ARM) || defined(_M_X64)
 108 uint32_t __inline __builtin_clzll(uint64_t value) {
 109   uint32_t leading_zero = 0;
 110   if (_BitScanReverse64(&leading_zero, value))
 111     return 63 - leading_zero;
 112   return 64;
 113 }
 114 #else
 115 uint32_t __inline __builtin_clzll(uint64_t value) {
 116   if (value == 0)
 117     return 64;
 118   uint32_t msh = (uint32_t)(value >> 32);
 119   uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
 120   if (msh != 0)
 121     return __builtin_clz(msh);
 122   return 32 + __builtin_clz(lsh);
 123 }
 124 #endif
 125
 126 #define __builtin_clzl __builtin_clzll
 127 #endif /* defined(_MSC_VER) && !defined(__clang__) */
 128
 129 #endif /* INT_LIB_H */