• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 # if defined(__arm__) && defined(_WIN32) && (!defined(_MSC_VER) || defined(__clang__))
39 #   define COMPILER_RT_ABI __attribute__((pcs("aapcs")))
40 # else
41 #   define COMPILER_RT_ABI
42 # endif
43 #endif
44 
45 #ifdef _MSC_VER
46 #define ALWAYS_INLINE __forceinline
47 #define NOINLINE __declspec(noinline)
48 #define NORETURN __declspec(noreturn)
49 #define UNUSED
50 #else
51 #define ALWAYS_INLINE __attribute__((always_inline))
52 #define NOINLINE __attribute__((noinline))
53 #define NORETURN __attribute__((noreturn))
54 #define UNUSED __attribute__((unused))
55 #endif
56 
57 #if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
58 /*
59  * Kernel and boot environment can't use normal headers,
60  * so use the equivalent system headers.
61  */
62 #  include <machine/limits.h>
63 #  include <sys/stdint.h>
64 #  include <sys/types.h>
65 #else
66 /* Include the standard compiler builtin headers we use functionality from. */
67 #  include <limits.h>
68 #  include <stdint.h>
69 #  include <stdbool.h>
70 #  include <float.h>
71 #endif
72 
73 /* Include the commonly used internal type definitions. */
74 #include "int_types.h"
75 
76 /* Include internal utility function declarations. */
77 #include "int_util.h"
78 
79 COMPILER_RT_ABI si_int __paritysi2(si_int a);
80 COMPILER_RT_ABI si_int __paritydi2(di_int a);
81 
82 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
83 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
84 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
85 
86 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
87 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
88 #ifdef CRT_HAS_128BIT
89 COMPILER_RT_ABI si_int __clzti2(ti_int a);
90 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
91 #endif
92 
93 /* Definitions for builtins unavailable on MSVC */
94 #if defined(_MSC_VER) && !defined(__clang__)
95 #include <intrin.h>
96 
__builtin_ctz(uint32_t value)97 uint32_t __inline __builtin_ctz(uint32_t value) {
98   uint32_t trailing_zero = 0;
99   if (_BitScanForward(&trailing_zero, value))
100     return trailing_zero;
101   return 32;
102 }
103 
__builtin_clz(uint32_t value)104 uint32_t __inline __builtin_clz(uint32_t value) {
105   uint32_t leading_zero = 0;
106   if (_BitScanReverse(&leading_zero, value))
107     return 31 - leading_zero;
108   return 32;
109 }
110 
111 #if defined(_M_ARM) || defined(_M_X64)
__builtin_clzll(uint64_t value)112 uint32_t __inline __builtin_clzll(uint64_t value) {
113   uint32_t leading_zero = 0;
114   if (_BitScanReverse64(&leading_zero, value))
115     return 63 - leading_zero;
116   return 64;
117 }
118 #else
__builtin_clzll(uint64_t value)119 uint32_t __inline __builtin_clzll(uint64_t value) {
120   if (value == 0)
121     return 64;
122   uint32_t msh = (uint32_t)(value >> 32);
123   uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
124   if (msh != 0)
125     return __builtin_clz(msh);
126   return 32 + __builtin_clz(lsh);
127 }
128 #endif
129 
130 #define __builtin_clzl __builtin_clzll
131 #endif // defined(_MSC_VER) && !defined(__clang__)
132 
133 #endif /* INT_LIB_H */
134