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 */ 130