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 /* 17 * Portions copyright (c) 2017, ARM Limited and Contributors. 18 * All rights reserved. 19 */ 20 21 #ifndef INT_LIB_H 22 #define INT_LIB_H 23 24 /* Assumption: Signed integral is 2's complement. */ 25 /* Assumption: Right shift of signed negative is arithmetic shift. */ 26 /* Assumption: Endianness is little or big (not mixed). */ 27 28 #if defined(__ELF__) 29 #define FNALIAS(alias_name, original_name) \ 30 void alias_name() __attribute__((alias(#original_name))) 31 #else 32 #define FNALIAS(alias, name) _Pragma("GCC error(\"alias unsupported on this file format\")") 33 #endif 34 35 /* ABI macro definitions */ 36 37 #if __ARM_EABI__ 38 # define ARM_EABI_FNALIAS(aeabi_name, name) \ 39 void __aeabi_##aeabi_name() __attribute__((alias("__" #name))); 40 # ifdef COMPILER_RT_ARMHF_TARGET 41 # define COMPILER_RT_ABI 42 # else 43 # define COMPILER_RT_ABI __attribute__((pcs("aapcs"))) 44 # endif 45 #else 46 # define ARM_EABI_FNALIAS(aeabi_name, name) 47 # define COMPILER_RT_ABI 48 #endif 49 50 #ifdef _MSC_VER 51 #define ALWAYS_INLINE __forceinline 52 #define NOINLINE __declspec(noinline) 53 #define NORETURN __declspec(noreturn) 54 #define UNUSED 55 #else 56 #define ALWAYS_INLINE __attribute__((always_inline)) 57 #define NOINLINE __attribute__((noinline)) 58 #define NORETURN __attribute__((noreturn)) 59 #define UNUSED __attribute__((unused)) 60 #endif 61 62 /* 63 * Kernel and boot environment can't use normal headers, 64 * so use the equivalent system headers. 65 */ 66 # include <sys/limits.h> 67 # include <sys/stdint.h> 68 # include <sys/types.h> 69 70 /* Include the commonly used internal type definitions. */ 71 #include "int_types.h" 72 73 COMPILER_RT_ABI si_int __paritysi2(si_int a); 74 COMPILER_RT_ABI si_int __paritydi2(di_int a); 75 76 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b); 77 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b); 78 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d); 79 80 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem); 81 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem); 82 #ifdef CRT_HAS_128BIT 83 COMPILER_RT_ABI si_int __clzti2(ti_int a); 84 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); 85 #endif 86 87 /* Definitions for builtins unavailable on MSVC */ 88 #if defined(_MSC_VER) && !defined(__clang__) 89 #include <intrin.h> 90 91 uint32_t __inline __builtin_ctz(uint32_t value) { 92 unsigned long trailing_zero = 0; 93 if (_BitScanForward(&trailing_zero, value)) 94 return trailing_zero; 95 return 32; 96 } 97 98 uint32_t __inline __builtin_clz(uint32_t value) { 99 unsigned long leading_zero = 0; 100 if (_BitScanReverse(&leading_zero, value)) 101 return 31 - leading_zero; 102 return 32; 103 } 104 105 #if defined(_M_ARM) || defined(_M_X64) 106 uint32_t __inline __builtin_clzll(uint64_t value) { 107 unsigned long leading_zero = 0; 108 if (_BitScanReverse64(&leading_zero, value)) 109 return 63 - leading_zero; 110 return 64; 111 } 112 #else 113 uint32_t __inline __builtin_clzll(uint64_t value) { 114 if (value == 0) 115 return 64; 116 uint32_t msh = (uint32_t)(value >> 32); 117 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF); 118 if (msh != 0) 119 return __builtin_clz(msh); 120 return 32 + __builtin_clz(lsh); 121 } 122 #endif 123 124 #define __builtin_clzl __builtin_clzll 125 #endif /* defined(_MSC_VER) && !defined(__clang__) */ 126 127 #endif /* INT_LIB_H */ 128
