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 //===--- Builtins.def - Builtin function info database ----------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // This is only documentation for the database layout. This will be removed once
 // all builtin databases are converted to tablegen files
 
 // The second value provided to the macro specifies the type of the function
 // (result value, then each argument) as follows:
 //  v -> void
 //  b -> boolean
 //  c -> char
 //  s -> short
 //  i -> int
 //  h -> half (__fp16, OpenCL)
 //  x -> half (_Float16)
 //  y -> half (__bf16)
 //  f -> float
 //  d -> double
 //  z -> size_t
 //  w -> wchar_t
 //  F -> constant CFString
 //  G -> id
 //  H -> SEL
 //  M -> struct objc_super
 //  a -> __builtin_va_list
 //  A -> "reference" to __builtin_va_list
 //  V -> Vector, followed by the number of elements and the base type.
 //  q -> Scalable vector, followed by the number of elements and the base type.
 //  Q -> target builtin type, followed by a character to distinguish the builtin type
 //    Qa -> AArch64 svcount_t builtin type.
 //    Qb -> AMDGPU __amdgpu_buffer_rsrc_t builtin type.
 //  E -> ext_vector, followed by the number of elements and the base type.
 //  X -> _Complex, followed by the base type.
 //  Y -> ptrdiff_t
 //  P -> FILE
 //  J -> jmp_buf
 //  SJ -> sigjmp_buf
 //  K -> ucontext_t
 //  p -> pid_t
 //  . -> "...".  This may only occur at the end of the function list.
 //
 // Types may be prefixed with the following modifiers:
 //  L   -> long (e.g. Li for 'long int', Ld for 'long double')
 //  LL  -> long long (e.g. LLi for 'long long int', LLd for __float128)
 //  LLL -> __int128_t (e.g. LLLi)
 //  Z   -> int32_t (require a native 32-bit integer type on the target)
 //  W   -> int64_t (require a native 64-bit integer type on the target)
 //  N   -> 'int' size if target is LP64, 'L' otherwise.
 //  O   -> long for OpenCL targets, long long otherwise.
 //  S   -> signed
 //  U   -> unsigned
 //  I   -> Required to constant fold to an integer constant expression.
 //
 // Types may be postfixed with the following modifiers:
 // * -> pointer (optionally followed by an address space number, if no address
 //               space is specified than any address space will be accepted)
 // & -> reference (optionally followed by an address space number)
 // C -> const
 // D -> volatile
 // R -> restrict
 
 // The third value provided to the macro specifies information about attributes
 // of the function.  These must be kept in sync with the predicates in the
 // Builtin::Context class.  Currently we have:
 //  n -> nothrow
 //  r -> noreturn
 //  U -> pure
 //  c -> const
 //  t -> signature is meaningless, use custom typechecking
 //  T -> type is not important to semantic analysis and codegen; recognize as
 //       builtin even if type doesn't match signature, and don't warn if we
 //       can't be sure the type is right
 //  F -> this is a libc/libm function with a '__builtin_' prefix added.
 //  f -> this is a libc/libm function without a '__builtin_' prefix, or with
 //       'z', a C++ standard library function in namespace std::. This builtin
 //       is disableable by '-fno-builtin-foo' / '-fno-builtin-std-foo'.
 //  h -> this function requires a specific header or an explicit declaration.
 //  i -> this is a runtime library implemented function without the
 //       '__builtin_' prefix. It will be implemented in compiler-rt or libgcc.
 //  p:N: -> this is a printf-like function whose Nth argument is the format
 //          string.
 //  P:N: -> similar to the p:N: attribute, but the function is like vprintf
 //          in that it accepts its arguments as a va_list rather than
 //          through an ellipsis
 //  s:N: -> this is a scanf-like function whose Nth argument is the format
 //          string.
 //  S:N: -> similar to the s:N: attribute, but the function is like vscanf
 //          in that it accepts its arguments as a va_list rather than
 //          through an ellipsis
 //  e -> const, but only when -fno-math-errno and FP exceptions are ignored
 //  g -> const when FP exceptions are ignored
 //  j -> returns_twice (like setjmp)
 //  u -> arguments are not evaluated for their side-effects
 //  V:N: -> requires vectors of at least N bits to be legal
 //  C<N,M_0,...,M_k> -> callback behavior: argument N is called with argument
 //                      M_0, ..., M_k as payload
 //  z -> this is a function in (possibly-versioned) namespace std
 //  E -> this function can be constant evaluated by Clang frontend
 //  G -> this is a C++20 consteval function

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