1 /* ===-- int_lib.h - configuration header for compiler-rt -----------------===
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 * ===----------------------------------------------------------------------===
10 * This file is a configuration header for compiler-rt.
11 * This file is not part of the interface of this library.
13 * ===----------------------------------------------------------------------===
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). */
24 #define FNALIAS(alias_name, original_name) \
25 void alias_name() __attribute__((alias(#original_name)))
27 #define FNALIAS(alias, name) _Pragma("GCC error(\"alias unsupported on this file format\")")
30 /* ABI macro definitions */
33 # define ARM_EABI_FNALIAS(aeabi_name, name) \
34 void __aeabi_##aeabi_name() __attribute__((alias("__" #name)));
36 # if !defined(__clang__) && defined(__GNUC__) && \
37 (__GNUC__ < 4 || __GNUC__ == 4 && __GNUC_MINOR__ < 5)
38 /* The pcs attribute was introduced in GCC 4.5.0 */
39 # define COMPILER_RT_ABI
41 # define COMPILER_RT_ABI __attribute__((pcs("aapcs")))
45 # define ARM_EABI_FNALIAS(aeabi_name, name)
46 # define COMPILER_RT_ABI
50 #define ALWAYS_INLINE __forceinline
51 #define NOINLINE __declspec(noinline)
52 #define NORETURN __declspec(noreturn)
55 #define ALWAYS_INLINE __attribute__((always_inline))
56 #define NOINLINE __attribute__((noinline))
57 #define NORETURN __attribute__((noreturn))
58 #define UNUSED __attribute__((unused))
61 #if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
63 * Kernel and boot environment can't use normal headers,
64 * so use the equivalent system headers.
66 # include <machine/limits.h>
67 # include <sys/stdint.h>
68 # include <sys/types.h>
70 /* Include the standard compiler builtin headers we use functionality from. */
77 /* Include the commonly used internal type definitions. */
78 #include "int_types.h"
80 /* Include internal utility function declarations. */
84 * Workaround for LLVM bug 11663. Prevent endless recursion in
85 * __c?zdi2(), where calls to __builtin_c?z() are expanded to
86 * __c?zdi2() instead of __c?zsi2().
88 * Instead of placing this workaround in c?zdi2.c, put it in this
89 * global header to prevent other C files from making the detour
90 * through __c?zdi2() as well.
92 * This problem has been observed on FreeBSD for sparc64 and
93 * mips64 with GCC 4.2.1, and for riscv with GCC 5.2.0.
94 * Presumably it's any version of GCC, and targeting an arch that
95 * does not have dedicated bit counting instructions.
97 #if defined(__FreeBSD__) && (defined(__sparc64__) || \
98 defined(__mips_n64) || defined(__mips_o64) || defined(__riscv__))
99 si_int __clzsi2(si_int);
100 si_int __ctzsi2(si_int);
101 #define __builtin_clz __clzsi2
102 #define __builtin_ctz __ctzsi2
103 #endif /* FreeBSD && (sparc64 || mips_n64 || mips_o64) */
105 COMPILER_RT_ABI si_int __paritysi2(si_int a);
106 COMPILER_RT_ABI si_int __paritydi2(di_int a);
108 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
109 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
110 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
112 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
113 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
114 #ifdef CRT_HAS_128BIT
115 COMPILER_RT_ABI si_int __clzti2(ti_int a);
116 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
119 /* Definitions for builtins unavailable on MSVC */
120 #if defined(_MSC_VER) && !defined(__clang__)
123 uint32_t __inline __builtin_ctz(uint32_t value) {
124 unsigned long trailing_zero = 0;
125 if (_BitScanForward(&trailing_zero, value))
126 return trailing_zero;
130 uint32_t __inline __builtin_clz(uint32_t value) {
131 unsigned long leading_zero = 0;
132 if (_BitScanReverse(&leading_zero, value))
133 return 31 - leading_zero;
137 #if defined(_M_ARM) || defined(_M_X64)
138 uint32_t __inline __builtin_clzll(uint64_t value) {
139 unsigned long leading_zero = 0;
140 if (_BitScanReverse64(&leading_zero, value))
141 return 63 - leading_zero;
145 uint32_t __inline __builtin_clzll(uint64_t value) {
148 uint32_t msh = (uint32_t)(value >> 32);
149 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
151 return __builtin_clz(msh);
152 return 32 + __builtin_clz(lsh);
156 #define __builtin_clzl __builtin_clzll
157 #endif /* defined(_MSC_VER) && !defined(__clang__) */
159 #endif /* INT_LIB_H */