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 #define COMPILER_RT_ALIAS(aliasee) __attribute__((__alias__(#aliasee)))
27 #else
28 #define FNALIAS(alias, name) _Pragma("GCC error(\"alias unsupported on this file format\")")
29 #define COMPILER_RT_ALIAS(aliasee) _Pragma("GCC error(\"alias unsupported on this file format\")")
30 #endif
31
32 /* ABI macro definitions */
33
34 #if __ARM_EABI__
35 # ifdef COMPILER_RT_ARMHF_TARGET
36 # define COMPILER_RT_ABI
37 # else
38 # define COMPILER_RT_ABI __attribute__((__pcs__("aapcs")))
39 # endif
40 #else
41 # define COMPILER_RT_ABI
42 #endif
43
44 #define AEABI_RTABI __attribute__((__pcs__("aapcs")))
45
46 #ifdef _MSC_VER
47 #define ALWAYS_INLINE __forceinline
48 #define NOINLINE __declspec(noinline)
49 #define NORETURN __declspec(noreturn)
50 #define UNUSED
51 #else
52 #define ALWAYS_INLINE __attribute__((always_inline))
53 #define NOINLINE __attribute__((noinline))
54 #define NORETURN __attribute__((noreturn))
55 #define UNUSED __attribute__((unused))
56 #endif
57
58 #if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
59 /*
60 * Kernel and boot environment can't use normal headers,
61 * so use the equivalent system headers.
62 */
63 # include <machine/limits.h>
64 # include <sys/stdint.h>
65 # include <sys/types.h>
66 #else
67 /* Include the standard compiler builtin headers we use functionality from. */
68 # include <limits.h>
69 # include <stdint.h>
70 # include <stdbool.h>
71 # include <float.h>
72 #endif
73
74 /* Include the commonly used internal type definitions. */
75 #include "int_types.h"
76
77 /* Include internal utility function declarations. */
78 #include "int_util.h"
79
80 COMPILER_RT_ABI si_int __paritysi2(si_int a);
81 COMPILER_RT_ABI si_int __paritydi2(di_int a);
82
83 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
84 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
85 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
86
87 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
88 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
89 #ifdef CRT_HAS_128BIT
90 COMPILER_RT_ABI si_int __clzti2(ti_int a);
91 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
92 #endif
93
94 /* Definitions for builtins unavailable on MSVC */
95 #if defined(_MSC_VER) && !defined(__clang__)
96 #include <intrin.h>
97
__builtin_ctz(uint32_t value)98 uint32_t __inline __builtin_ctz(uint32_t value) {
99 uint32_t trailing_zero = 0;
100 if (_BitScanForward(&trailing_zero, value))
101 return trailing_zero;
102 return 32;
103 }
104
__builtin_clz(uint32_t value)105 uint32_t __inline __builtin_clz(uint32_t value) {
106 uint32_t leading_zero = 0;
107 if (_BitScanReverse(&leading_zero, value))
108 return 31 - leading_zero;
109 return 32;
110 }
111
112 #if defined(_M_ARM) || defined(_M_X64)
__builtin_clzll(uint64_t value)113 uint32_t __inline __builtin_clzll(uint64_t value) {
114 uint32_t leading_zero = 0;
115 if (_BitScanReverse64(&leading_zero, value))
116 return 63 - leading_zero;
117 return 64;
118 }
119 #else
__builtin_clzll(uint64_t value)120 uint32_t __inline __builtin_clzll(uint64_t value) {
121 if (value == 0)
122 return 64;
123 uint32_t msh = (uint32_t)(value >> 32);
124 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
125 if (msh != 0)
126 return __builtin_clz(msh);
127 return 32 + __builtin_clz(lsh);
128 }
129 #endif
130
131 #define __builtin_clzl __builtin_clzll
132 #endif /* defined(_MSC_VER) && !defined(__clang__) */
133
134 #endif /* INT_LIB_H */
135