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__) || defined(__asmjs__)
52 #define COMPILER_RT_ALIAS(name, aliasname) \
53 COMPILER_RT_ABI __typeof(name) aliasname __attribute__((__alias__(#name)));
54 #elif defined(__APPLE__)
55 #define COMPILER_RT_ALIAS(name, aliasname) \
56 __asm__(".globl " SYMBOL_NAME(aliasname)); \
57 __asm__(SYMBOL_NAME(aliasname) " = " SYMBOL_NAME(name)); \
58 COMPILER_RT_ABI __typeof(name) aliasname;
59 #elif defined(_WIN32)
60 #define COMPILER_RT_ALIAS(name, aliasname)
61 #else
62 #error Unsupported target
63 #endif
64
65 #if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
66 //
67 // Kernel and boot environment can't use normal headers,
68 // so use the equivalent system headers.
69 //
70 #include <machine/limits.h>
71 #include <sys/stdint.h>
72 #include <sys/types.h>
73 #else
74 // Include the standard compiler builtin headers we use functionality from.
75 #include <float.h>
76 #include <limits.h>
77 #include <stdbool.h>
78 #include <stdint.h>
79 #endif
80
81 // Include the commonly used internal type definitions.
82 #include "int_types.h"
83
84 // Include internal utility function declarations.
85 #include "int_util.h"
86
87 COMPILER_RT_ABI si_int __paritysi2(si_int a);
88 COMPILER_RT_ABI si_int __paritydi2(di_int a);
89
90 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
91 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
92 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
93
94 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int *rem);
95 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem);
96 #ifdef CRT_HAS_128BIT
97 COMPILER_RT_ABI si_int __clzti2(ti_int a);
98 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int *rem);
99 #endif
100
101 // Definitions for builtins unavailable on MSVC
102 #if defined(_MSC_VER) && !defined(__clang__)
103 #include <intrin.h>
104
__builtin_ctz(uint32_t value)105 uint32_t __inline __builtin_ctz(uint32_t value) {
106 unsigned long trailing_zero = 0;
107 if (_BitScanForward(&trailing_zero, value))
108 return trailing_zero;
109 return 32;
110 }
111
__builtin_clz(uint32_t value)112 uint32_t __inline __builtin_clz(uint32_t value) {
113 unsigned long leading_zero = 0;
114 if (_BitScanReverse(&leading_zero, value))
115 return 31 - leading_zero;
116 return 32;
117 }
118
119 #if defined(_M_ARM) || defined(_M_X64)
__builtin_clzll(uint64_t value)120 uint32_t __inline __builtin_clzll(uint64_t value) {
121 unsigned long leading_zero = 0;
122 if (_BitScanReverse64(&leading_zero, value))
123 return 63 - leading_zero;
124 return 64;
125 }
126 #else
__builtin_clzll(uint64_t value)127 uint32_t __inline __builtin_clzll(uint64_t value) {
128 if (value == 0)
129 return 64;
130 uint32_t msh = (uint32_t)(value >> 32);
131 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
132 if (msh != 0)
133 return __builtin_clz(msh);
134 return 32 + __builtin_clz(lsh);
135 }
136 #endif
137
138 #define __builtin_clzl __builtin_clzll
139 #endif // defined(_MSC_VER) && !defined(__clang__)
140
141 #endif // INT_LIB_H
142