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