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) 2017-2018, 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 <limits.h> 67 # include <stdint.h> 68 69 /* Include the commonly used internal type definitions. */ 70 #include "int_types.h" 71 72 COMPILER_RT_ABI si_int __paritysi2(si_int a); 73 COMPILER_RT_ABI si_int __paritydi2(di_int a); 74 75 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b); 76 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b); 77 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d); 78 79 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem); 80 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem); 81 #ifdef CRT_HAS_128BIT 82 COMPILER_RT_ABI si_int __clzti2(ti_int a); 83 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); 84 #endif 85 86 /* Definitions for builtins unavailable on MSVC */ 87 #if defined(_MSC_VER) && !defined(__clang__) 88 #include <intrin.h> 89 90 uint32_t __inline __builtin_ctz(uint32_t value) { 91 unsigned long trailing_zero = 0; 92 if (_BitScanForward(&trailing_zero, value)) 93 return trailing_zero; 94 return 32; 95 } 96 97 uint32_t __inline __builtin_clz(uint32_t value) { 98 unsigned long leading_zero = 0; 99 if (_BitScanReverse(&leading_zero, value)) 100 return 31 - leading_zero; 101 return 32; 102 } 103 104 #if defined(_M_ARM) || defined(_M_X64) 105 uint32_t __inline __builtin_clzll(uint64_t value) { 106 unsigned long leading_zero = 0; 107 if (_BitScanReverse64(&leading_zero, value)) 108 return 63 - leading_zero; 109 return 64; 110 } 111 #else 112 uint32_t __inline __builtin_clzll(uint64_t value) { 113 if (value == 0) 114 return 64; 115 uint32_t msh = (uint32_t)(value >> 32); 116 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF); 117 if (msh != 0) 118 return __builtin_clz(msh); 119 return 32 + __builtin_clz(lsh); 120 } 121 #endif 122 123 #define __builtin_clzl __builtin_clzll 124 #endif /* defined(_MSC_VER) && !defined(__clang__) */ 125 126 #endif /* INT_LIB_H */ 127