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 #if defined(COMPILER_RT_ARMHF_TARGET) || (!defined(__clang__) && \ 25 defined(__GNUC__) && (__GNUC__ < 4 || __GNUC__ == 4 && __GNUC_MINOR__ < 5)) 26 // The pcs attribute was introduced in GCC 4.5.0 27 #define COMPILER_RT_ABI 28 #else 29 #define COMPILER_RT_ABI __attribute__((__pcs__("aapcs"))) 30 #endif 31 #else 32 #define COMPILER_RT_ABI 33 #endif 34 35 #define AEABI_RTABI __attribute__((__pcs__("aapcs"))) 36 37 #if defined(_MSC_VER) && !defined(__clang__) 38 #define ALWAYS_INLINE __forceinline 39 #define NOINLINE __declspec(noinline) 40 #define NORETURN __declspec(noreturn) 41 #define UNUSED 42 #else 43 #define ALWAYS_INLINE __attribute__((always_inline)) 44 #define NOINLINE __attribute__((noinline)) 45 #define NORETURN __attribute__((noreturn)) 46 #define UNUSED __attribute__((unused)) 47 #endif 48 49 #define STR(a) #a 50 #define XSTR(a) STR(a) 51 #define SYMBOL_NAME(name) XSTR(__USER_LABEL_PREFIX__) #name 52 53 #if defined(__ELF__) || defined(__MINGW32__) || defined(__wasm__) 54 #define COMPILER_RT_ALIAS(name, aliasname) \ 55 COMPILER_RT_ABI __typeof(name) aliasname __attribute__((__alias__(#name))); 56 #elif defined(__APPLE__) 57 #define COMPILER_RT_ALIAS(name, aliasname) \ 58 __asm__(".globl " SYMBOL_NAME(aliasname)); \ 59 __asm__(SYMBOL_NAME(aliasname) " = " SYMBOL_NAME(name)); \ 60 COMPILER_RT_ABI __typeof(name) aliasname; 61 #elif defined(_WIN32) 62 #define COMPILER_RT_ALIAS(name, aliasname) 63 #else 64 #error Unsupported target 65 #endif 66 67 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && (defined(_KERNEL) || defined(_STANDALONE)) 68 // 69 // Kernel and boot environment can't use normal headers, 70 // so use the equivalent system headers. 71 // 72 #ifdef __FreeBSD__ 73 #include <sys/limits.h> 74 #else 75 #include <machine/limits.h> 76 #endif 77 #include <sys/stdint.h> 78 #include <sys/types.h> 79 #else 80 // Include the standard compiler builtin headers we use functionality from. 81 #include <float.h> 82 #include <limits.h> 83 #include <stdbool.h> 84 #include <stdint.h> 85 #endif 86 87 // Include the commonly used internal type definitions. 88 #include "int_types.h" 89 90 // Include internal utility function declarations. 91 #include "int_util.h" 92 93 /* 94 * Workaround for LLVM bug 11663. Prevent endless recursion in 95 * __c?zdi2(), where calls to __builtin_c?z() are expanded to 96 * __c?zdi2() instead of __c?zsi2(). 97 * 98 * Instead of placing this workaround in c?zdi2.c, put it in this 99 * global header to prevent other C files from making the detour 100 * through __c?zdi2() as well. 101 * 102 * This problem has been observed on FreeBSD for sparc64 and 103 * mips64 with GCC 4.2.1, and for riscv with GCC 5.2.0. 104 * Presumably it's any version of GCC, and targeting an arch that 105 * does not have dedicated bit counting instructions. 106 */ 107 #if defined(__FreeBSD__) && (defined(__sparc64__) || \ 108 defined(__mips_n32) || defined(__mips_n64) || defined(__mips_o64) || \ 109 defined(__riscv)) 110 si_int __clzsi2(si_int); 111 si_int __ctzsi2(si_int); 112 #define __builtin_clz __clzsi2 113 #define __builtin_ctz __ctzsi2 114 #endif /* FreeBSD && (sparc64 || mips_n32 || mips_n64 || mips_o64 || riscv) */ 115 116 COMPILER_RT_ABI si_int __paritysi2(si_int a); 117 COMPILER_RT_ABI si_int __paritydi2(di_int a); 118 119 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b); 120 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b); 121 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d); 122 123 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int *rem); 124 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem); 125 #ifdef CRT_HAS_128BIT 126 COMPILER_RT_ABI si_int __clzti2(ti_int a); 127 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int *rem); 128 #endif 129 130 // Definitions for builtins unavailable on MSVC 131 #if defined(_MSC_VER) && !defined(__clang__) 132 #include <intrin.h> 133 134 uint32_t __inline __builtin_ctz(uint32_t value) { 135 unsigned long trailing_zero = 0; 136 if (_BitScanForward(&trailing_zero, value)) 137 return trailing_zero; 138 return 32; 139 } 140 141 uint32_t __inline __builtin_clz(uint32_t value) { 142 unsigned long leading_zero = 0; 143 if (_BitScanReverse(&leading_zero, value)) 144 return 31 - leading_zero; 145 return 32; 146 } 147 148 #if defined(_M_ARM) || defined(_M_X64) 149 uint32_t __inline __builtin_clzll(uint64_t value) { 150 unsigned long leading_zero = 0; 151 if (_BitScanReverse64(&leading_zero, value)) 152 return 63 - leading_zero; 153 return 64; 154 } 155 #else 156 uint32_t __inline __builtin_clzll(uint64_t value) { 157 if (value == 0) 158 return 64; 159 uint32_t msh = (uint32_t)(value >> 32); 160 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF); 161 if (msh != 0) 162 return __builtin_clz(msh); 163 return 32 + __builtin_clz(lsh); 164 } 165 #endif 166 167 #define __builtin_clzl __builtin_clzll 168 #endif // defined(_MSC_VER) && !defined(__clang__) 169 170 #endif // INT_LIB_H 171