1 //===-- int_lib.h - configuration header for compiler-rt -----------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a configuration header for compiler-rt. 10 // This file is not part of the interface of this library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef INT_LIB_H 15 #define INT_LIB_H 16 17 // Assumption: Signed integral is 2's complement. 18 // Assumption: Right shift of signed negative is arithmetic shift. 19 // Assumption: Endianness is little or big (not mixed). 20 21 // ABI macro definitions 22 23 #if __ARM_EABI__ 24 #ifdef COMPILER_RT_ARMHF_TARGET 25 #define COMPILER_RT_ABI 26 #else 27 #define COMPILER_RT_ABI __attribute__((__pcs__("aapcs"))) 28 #endif 29 #else 30 #define COMPILER_RT_ABI 31 #endif 32 33 #define AEABI_RTABI __attribute__((__pcs__("aapcs"))) 34 35 #if defined(_MSC_VER) && !defined(__clang__) 36 #define ALWAYS_INLINE __forceinline 37 #define NOINLINE __declspec(noinline) 38 #define NORETURN __declspec(noreturn) 39 #define UNUSED 40 #else 41 #define ALWAYS_INLINE __attribute__((always_inline)) 42 #define NOINLINE __attribute__((noinline)) 43 #define NORETURN __attribute__((noreturn)) 44 #define UNUSED __attribute__((unused)) 45 #endif 46 47 #define STR(a) #a 48 #define XSTR(a) STR(a) 49 #define SYMBOL_NAME(name) XSTR(__USER_LABEL_PREFIX__) #name 50 51 #if defined(__ELF__) || defined(__MINGW32__) || defined(__wasm__) || \ 52 defined(_AIX) 53 #define COMPILER_RT_ALIAS(name, aliasname) \ 54 COMPILER_RT_ABI __typeof(name) aliasname __attribute__((__alias__(#name))); 55 #elif defined(__APPLE__) 56 #if defined(VISIBILITY_HIDDEN) 57 #define COMPILER_RT_ALIAS_VISIBILITY(name) \ 58 __asm__(".private_extern " SYMBOL_NAME(name)); 59 #else 60 #define COMPILER_RT_ALIAS_VISIBILITY(name) 61 #endif 62 #define COMPILER_RT_ALIAS(name, aliasname) \ 63 __asm__(".globl " SYMBOL_NAME(aliasname)); \ 64 COMPILER_RT_ALIAS_VISIBILITY(aliasname) \ 65 __asm__(SYMBOL_NAME(aliasname) " = " SYMBOL_NAME(name)); \ 66 COMPILER_RT_ABI __typeof(name) aliasname; 67 #elif defined(_WIN32) 68 #define COMPILER_RT_ALIAS(name, aliasname) 69 #else 70 #error Unsupported target 71 #endif 72 73 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && \ 74 (defined(_KERNEL) || defined(_STANDALONE)) 75 // 76 // Kernel and boot environment can't use normal headers, 77 // so use the equivalent system headers. 78 // NB: FreeBSD (and OpenBSD) deprecate machine/limits.h in 79 // favour of sys/limits.h, so prefer the former, but fall 80 // back on the latter if not available since NetBSD only has 81 // the latter. 82 // 83 #if defined(__has_include) && __has_include(<sys/limits.h>) 84 #include <sys/limits.h> 85 #else 86 #include <machine/limits.h> 87 #endif 88 #include <sys/stdint.h> 89 #include <sys/types.h> 90 #else 91 // Include the standard compiler builtin headers we use functionality from. 92 #include <float.h> 93 #include <limits.h> 94 #include <stdbool.h> 95 #include <stdint.h> 96 #endif 97 98 // Include the commonly used internal type definitions. 99 #include "int_types.h" 100 101 // Include internal utility function declarations. 102 #include "int_util.h" 103 104 COMPILER_RT_ABI int __paritysi2(si_int a); 105 COMPILER_RT_ABI int __paritydi2(di_int a); 106 107 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b); 108 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b); 109 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d); 110 111 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int *rem); 112 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem); 113 #ifdef CRT_HAS_128BIT 114 COMPILER_RT_ABI int __clzti2(ti_int a); 115 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int *rem); 116 #endif 117 118 // Definitions for builtins unavailable on MSVC 119 #if defined(_MSC_VER) && !defined(__clang__) 120 #include <intrin.h> 121 122 int __inline __builtin_ctz(uint32_t value) { 123 unsigned long trailing_zero = 0; 124 if (_BitScanForward(&trailing_zero, value)) 125 return trailing_zero; 126 return 32; 127 } 128 129 int __inline __builtin_clz(uint32_t value) { 130 unsigned long leading_zero = 0; 131 if (_BitScanReverse(&leading_zero, value)) 132 return 31 - leading_zero; 133 return 32; 134 } 135 136 #if defined(_M_ARM) || defined(_M_X64) 137 int __inline __builtin_clzll(uint64_t value) { 138 unsigned long leading_zero = 0; 139 if (_BitScanReverse64(&leading_zero, value)) 140 return 63 - leading_zero; 141 return 64; 142 } 143 #else 144 int __inline __builtin_clzll(uint64_t value) { 145 if (value == 0) 146 return 64; 147 uint32_t msh = (uint32_t)(value >> 32); 148 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF); 149 if (msh != 0) 150 return __builtin_clz(msh); 151 return 32 + __builtin_clz(lsh); 152 } 153 #endif 154 155 #define __builtin_clzl __builtin_clzll 156 157 bool __inline __builtin_sadd_overflow(int x, int y, int *result) { 158 if ((x < 0) != (y < 0)) { 159 *result = x + y; 160 return false; 161 } 162 int tmp = (unsigned int)x + (unsigned int)y; 163 if ((tmp < 0) != (x < 0)) 164 return true; 165 *result = tmp; 166 return false; 167 } 168 169 #endif // defined(_MSC_VER) && !defined(__clang__) 170 171 #endif // INT_LIB_H 172