src/compiler-rt/lib/builtins/int_lib.h

   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 /*
  76  * Workaround for LLVM bug 11663.  Prevent endless recursion in
  77  * __c?zdi2(), where calls to __builtin_c?z() are expanded to
  78  * __c?zdi2() instead of __c?zsi2().
  79  *
  80  * Instead of placing this workaround in c?zdi2.c, put it in this
  81  * global header to prevent other C files from making the detour
  82  * through __c?zdi2() as well.
  83  *
  84  * This problem has been observed on FreeBSD for sparc64 and
  85  * mips64 with GCC 4.2.1, and for riscv with GCC 5.2.0.
  86  * Presumably it's any version of GCC, and targeting an arch that
  87  * does not have dedicated bit counting instructions.
  88  */
  89 #if (defined(__sparc64__) || defined(__sparcv9) || defined(__mips_n64) || defined(__mips_o64) || defined(__riscv__) \
  90                 || (defined(_MIPS_SIM) && ((_MIPS_SIM == _ABI64) || (_MIPS_SIM == _ABIO64))))
  91 si_int __clzsi2(si_int);
  92 si_int __ctzsi2(si_int);
  93 #define __builtin_clz __clzsi2
  94 #define __builtin_ctz __ctzsi2
  95 #endif /* sparc64 || mips_n64 || mips_o64 || riscv */
  96
  97 COMPILER_RT_ABI si_int __paritysi2(si_int a);
  98 COMPILER_RT_ABI si_int __paritydi2(di_int a);
  99
 100 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
 101 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
 102 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
 103
 104 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
 105 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
 106 #ifdef CRT_HAS_128BIT
 107 COMPILER_RT_ABI si_int __clzti2(ti_int a);
 108 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
 109 #endif
 110
 111 /* Definitions for builtins unavailable on MSVC */
 112 #if defined(_MSC_VER) && !defined(__clang__)
 113 #include <intrin.h>
 114
 115 uint32_t __inline __builtin_ctz(uint32_t value) {
 116   uint32_t trailing_zero = 0;
 117   if (_BitScanForward(&trailing_zero, value))
 118     return trailing_zero;
 119   return 32;
 120 }
 121
 122 uint32_t __inline __builtin_clz(uint32_t value) {
 123   uint32_t leading_zero = 0;
 124   if (_BitScanReverse(&leading_zero, value))
 125     return 31 - leading_zero;
 126   return 32;
 127 }
 128
 129 #if defined(_M_ARM) || defined(_M_X64)
 130 uint32_t __inline __builtin_clzll(uint64_t value) {
 131   uint32_t leading_zero = 0;
 132   if (_BitScanReverse64(&leading_zero, value))
 133     return 63 - leading_zero;
 134   return 64;
 135 }
 136 #else
 137 uint32_t __inline __builtin_clzll(uint64_t value) {
 138   if (value == 0)
 139     return 64;
 140   uint32_t msh = (uint32_t)(value >> 32);
 141   uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
 142   if (msh != 0)
 143     return __builtin_clz(msh);
 144   return 32 + __builtin_clz(lsh);
 145 }
 146 #endif
 147
 148 #define __builtin_clzl __builtin_clzll
 149 #endif /* defined(_MSC_VER) && !defined(__clang__) */
 150
 151 #endif /* INT_LIB_H */