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
__builtin_ctz(uint32_t value)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
__builtin_clz(uint32_t value)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)
__builtin_clzll(uint64_t value)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
__builtin_clzll(uint64_t value)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
__builtin_sadd_overflow(int x,int y,int * result)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