* Local Labels:: Labels local to a block.
* Labels as Values:: Getting pointers to labels, and computed gotos.
* Nested Functions:: As in Algol and Pascal, lexical scoping of functions.
-* Constructing Calls:: Dispatching a call to another function.
+* Constructing Calls:: Dispatching a call to another function.
* Typeof:: @code{typeof}: referring to the type of an expression.
* Conditionals:: Omitting the middle operand of a @samp{?:} expression.
-* Long Long:: Double-word integers---@code{long long int}.
+* Long Long:: Double-word integers---@code{long long int}.
* Complex:: Data types for complex numbers.
* Floating Types:: Additional Floating Types.
* Decimal Float:: Decimal Floating Types.
* Zero Length:: Zero-length arrays.
* Variable Length:: Arrays whose length is computed at run time.
* Empty Structures:: Structures with no members.
-* Variadic Macros:: Macros with a variable number of arguments.
+* Variadic Macros:: Macros with a variable number of arguments.
* Escaped Newlines:: Slightly looser rules for escaped newlines.
* Subscripting:: Any array can be subscripted, even if not an lvalue.
* Pointer Arith:: Arithmetic on @code{void}-pointers and function pointers.
* Initializers:: Non-constant initializers.
* Compound Literals:: Compound literals give structures, unions
- or arrays as values.
-* Designated Inits:: Labeling elements of initializers.
+ or arrays as values.
+* Designated Inits:: Labeling elements of initializers.
* Cast to Union:: Casting to union type from any member of the union.
-* Case Ranges:: `case 1 ... 9' and such.
-* Mixed Declarations:: Mixing declarations and code.
+* Case Ranges:: `case 1 ... 9' and such.
+* Mixed Declarations:: Mixing declarations and code.
* Function Attributes:: Declaring that functions have no side effects,
- or that they can never return.
+ or that they can never return.
* Attribute Syntax:: Formal syntax for attributes.
* Function Prototypes:: Prototype declarations and old-style definitions.
* C++ Comments:: C++ comments are recognized.
* Dollar Signs:: Dollar sign is allowed in identifiers.
* Character Escapes:: @samp{\e} stands for the character @key{ESC}.
-* Variable Attributes:: Specifying attributes of variables.
-* Type Attributes:: Specifying attributes of types.
+* Variable Attributes:: Specifying attributes of variables.
+* Type Attributes:: Specifying attributes of types.
* Alignment:: Inquiring about the alignment of a type or variable.
* Inline:: Defining inline functions (as fast as macros).
* Extended Asm:: Assembler instructions with C expressions as operands.
- (With them you can define ``built-in'' functions.)
+ (With them you can define ``built-in'' functions.)
* Constraints:: Constraints for asm operands
* Asm Labels:: Specifying the assembler name to use for a C symbol.
* Explicit Reg Vars:: Defining variables residing in specified registers.
* Alternate Keywords:: @code{__const__}, @code{__asm__}, etc., for header files.
* Incomplete Enums:: @code{enum foo;}, with details to follow.
-* Function Names:: Printable strings which are the name of the current
- function.
+* Function Names:: Printable strings which are the name of the current
+ function.
* Return Address:: Getting the return or frame address of a function.
* Vector Extensions:: Using vector instructions through built-in functions.
* Offsetof:: Special syntax for implementing @code{offsetof}.
-* Atomic Builtins:: Built-in functions for atomic memory access.
+* Atomic Builtins:: Built-in functions for atomic memory access.
* Object Size Checking:: Built-in functions for limited buffer overflow
checking.
* Other Builtins:: Other built-in functions.
@item interrupt
@cindex interrupt handler functions
-Use this attribute on the ARM, AVR, CRX, M32C, M32R/D, m68k, MS1,
+Use this attribute on the ARM, AVR, CRX, M32C, M32R/D, m68k,
and Xstormy16 ports to indicate that the specified function is an
interrupt handler. The compiler will generate function entry and exit
sequences suitable for use in an interrupt handler when this attribute
independent and hence this attribute must not be used for objects
defined by shared libraries.
+@item ms_abi/sysv_abi
+@cindex @code{ms_abi} attribute
+@cindex @code{sysv_abi} attribute
+
+On 64-bit x86_65-*-* targets, you can use an ABI attribute to indicate
+which calling convention should be used for a function. The @code{ms_abi}
+attribute tells the compiler to use the Microsoft ABI, while the
+@code{sysv_abi} attribute tells the compiler to use the ABI used on
+GNU/Linux and other systems. The default is to use the Microsoft ABI
+when targeting Windows. On all other systems, the default is the AMD ABI.
+
+Note, This feature is currently sorried out for Windows targets trying to
+
@item naked
@cindex function without a prologue/epilogue code
Use this attribute on the ARM, AVR, IP2K and SPU ports to indicate that
the specified function does not need prologue/epilogue sequences generated by
-the compiler. It is up to the programmer to provide these sequences.
+the compiler. It is up to the programmer to provide these sequences. The
+only statements that can be safely included in naked functions are
+@code{asm} statements that do not have operands. All other statements,
+including declarations of local variables, @code{if} statements, and so
+forth, should be avoided. Naked functions should be used to implement the
+body of an assembly function, while allowing the compiler to construct
+the requisite function declaration for the assembler.
@item near
@cindex functions which do not handle memory bank switching on 68HC11/68HC12
@smallexample
extern void *
my_memcpy (void *dest, const void *src, size_t len)
- __attribute__((nonnull (1, 2)));
+ __attribute__((nonnull (1, 2)));
@end smallexample
@noindent
@smallexample
extern void *
my_memcpy (void *dest, const void *src, size_t len)
- __attribute__((nonnull));
+ __attribute__((nonnull));
@end smallexample
@item noreturn
compilers.
@item weak
-The @code{weak} attribute is described in @xref{Function Attributes}.
+The @code{weak} attribute is described in @ref{Function Attributes}.
@item dllimport
-The @code{dllimport} attribute is described in @xref{Function Attributes}.
+The @code{dllimport} attribute is described in @ref{Function Attributes}.
@item dllexport
-The @code{dllexport} attribute is described in @xref{Function Attributes}.
+The @code{dllexport} attribute is described in @ref{Function Attributes}.
@end table
@code{altivec}, @code{ms_struct} and @code{gcc_struct}.
For full documentation of the struct attributes please see the
-documentation in the @xref{i386 Variable Attributes}, section.
+documentation in @ref{i386 Variable Attributes}.
For documentation of @code{altivec} attribute please see the
-documentation in the @xref{PowerPC Type Attributes}, section.
+documentation in @ref{PowerPC Type Attributes}.
@subsection SPU Variable Attributes
The SPU supports the @code{spu_vector} attribute for variables. For
-documentation of this attribute please see the documentation in the
-@xref{SPU Type Attributes}, section.
+documentation of this attribute please see the documentation in
+@ref{SPU Type Attributes}.
@subsection Xstormy16 Variable Attributes
One attribute is currently defined for xstormy16 configurations:
-@code{below100}
+@code{below100}.
@table @code
@item below100
Otherwise the two shared objects will be unable to use the same
typeinfo node and exception handling will break.
+@end table
+
@subsection ARM Type Attributes
On those ARM targets that support @code{dllimport} (such as Symbian
@subsection i386 Type Attributes
Two attributes are currently defined for i386 configurations:
-@code{ms_struct} and @code{gcc_struct}
+@code{ms_struct} and @code{gcc_struct}.
+
+@table @code
@item ms_struct
@itemx gcc_struct
Three attributes currently are defined for PowerPC configurations:
@code{altivec}, @code{ms_struct} and @code{gcc_struct}.
-For full documentation of the struct attributes please see the
-documentation in the @xref{i386 Type Attributes}, section.
+For full documentation of the @code{ms_struct} and @code{gcc_struct}
+attributes please see the documentation in @ref{i386 Type Attributes}.
The @code{altivec} attribute allows one to declare AltiVec vector data
types supported by the AltiVec Programming Interface Manual. The
function, as a string. The first of these is @code{__func__}, which
is part of the C99 standard:
-@display
The identifier @code{__func__} is implicitly declared by the translator
as if, immediately following the opening brace of each function
definition, the declaration
static const char __func__[] = "function-name";
@end smallexample
+@noindent
appeared, where function-name is the name of the lexically-enclosing
function. This name is the unadorned name of the function.
-@end display
@code{__FUNCTION__} is another name for @code{__func__}. Older
versions of GCC recognize only this name. However, it is not
@smallexample
primary:
- "__builtin_offsetof" "(" @code{typename} "," offsetof_member_designator ")"
+ "__builtin_offsetof" "(" @code{typename} "," offsetof_member_designator ")"
offsetof_member_designator:
- @code{identifier}
- | offsetof_member_designator "." @code{identifier}
- | offsetof_member_designator "[" @code{expr} "]"
+ @code{identifier}
+ | offsetof_member_designator "." @code{identifier}
+ | offsetof_member_designator "[" @code{expr} "]"
@end smallexample
This extension is sufficient such that
assert (__builtin_object_size (p, 1) == sizeof (var.buf1) - 1);
/* The object q points to is var. */
assert (__builtin_object_size (q, 0)
- == (char *) (&var + 1) - (char *) &var.b);
+ == (char *) (&var + 1) - (char *) &var.b);
/* The subobject q points to is var.b. */
assert (__builtin_object_size (q, 1) == sizeof (var.b));
@end smallexample
@smallexample
int __builtin___sprintf_chk (char *s, int flag, size_t os, const char *fmt, ...);
int __builtin___snprintf_chk (char *s, size_t maxlen, int flag, size_t os,
- const char *fmt, ...);
+ const char *fmt, ...);
int __builtin___vsprintf_chk (char *s, int flag, size_t os, const char *fmt,
- va_list ap);
+ va_list ap);
int __builtin___vsnprintf_chk (char *s, size_t maxlen, int flag, size_t os,
- const char *fmt, va_list ap);
+ const char *fmt, va_list ap);
@end smallexample
The added @var{flag} argument is passed unchanged to @code{__sprintf_chk}
@node Other Builtins
@section Other built-in functions provided by GCC
@cindex built-in functions
+@findex __builtin_fpclassify
@findex __builtin_isfinite
@findex __builtin_isnormal
@findex __builtin_isgreater
@findex __builtin_isgreaterequal
+@findex __builtin_isinf_sign
@findex __builtin_isless
@findex __builtin_islessequal
@findex __builtin_islessgreater
@code{islessgreater}, and @code{isunordered}) , with @code{__builtin_}
prefixed. We intend for a library implementor to be able to simply
@code{#define} each standard macro to its built-in equivalent.
-In the same fashion, GCC provides @code{isfinite} and @code{isnormal}
-built-ins used with @code{__builtin_} prefixed.
+In the same fashion, GCC provides @code{fpclassify}, @code{isfinite},
+@code{isinf_sign} and @code{isnormal} built-ins used with
+@code{__builtin_} prefixed. The @code{isinf} and @code{isnan}
+builtins appear both with and without the @code{__builtin_} prefix.
@deftypefn {Built-in Function} int __builtin_types_compatible_p (@var{type1}, @var{type2})
type is @code{long double}.
@end deftypefn
+@deftypefn {Built-in Function} int __builtin_fpclassify (int, int, int, int, int, ...)
+This built-in implements the C99 fpclassify functionality. The first
+five int arguments should be the target library's notion of the
+possible FP classes and are used for return values. They must be
+constant values and they must appear in this order: @code{FP_NAN},
+@code{FP_INFINITE}, @code{FP_NORMAL}, @code{FP_SUBNORMAL} and
+@code{FP_ZERO}. The ellipsis is for exactly one floating point value
+to classify. GCC treats the last argument as type-generic, which
+means it does not do default promotion from float to double.
+@end deftypefn
+
@deftypefn {Built-in Function} double __builtin_inf (void)
Similar to @code{__builtin_huge_val}, except a warning is generated
if the target floating-point format does not support infinities.
type is @code{long double}.
@end deftypefn
+@deftypefn {Built-in Function} int __builtin_isinf_sign (...)
+Similar to @code{isinf}, except the return value will be negative for
+an argument of @code{-Inf}. Note while the parameter list is an
+ellipsis, this function only accepts exactly one floating point
+argument. GCC treats this parameter as type-generic, which means it
+does not do default promotion from float to double.
+@end deftypefn
+
@deftypefn {Built-in Function} double __builtin_nan (const char *str)
This is an implementation of the ISO C99 function @code{nan}.
* X86 Built-in Functions::
* MIPS DSP Built-in Functions::
* MIPS Paired-Single Support::
+* MIPS Loongson Built-in Functions::
* PowerPC AltiVec Built-in Functions::
* SPARC VIS Built-in Functions::
* SPU Built-in Functions::
Generates the @code{movss} machine instruction as a load from memory.
@item void __builtin_ia32_storess (float *, v4sf)
Generates the @code{movss} machine instruction as a store to memory.
-@item v4sf __builtin_ia32_loadhps (v4sf, v2si *)
+@item v4sf __builtin_ia32_loadhps (v4sf, const v2sf *)
Generates the @code{movhps} machine instruction as a load from memory.
-@item v4sf __builtin_ia32_loadlps (v4sf, v2si *)
+@item v4sf __builtin_ia32_loadlps (v4sf, const v2sf *)
Generates the @code{movlps} machine instruction as a load from memory
-@item void __builtin_ia32_storehps (v4sf, v2si *)
+@item void __builtin_ia32_storehps (v2sf *, v4sf)
Generates the @code{movhps} machine instruction as a store to memory.
-@item void __builtin_ia32_storelps (v4sf, v2si *)
+@item void __builtin_ia32_storelps (v2sf *, v4sf)
Generates the @code{movlps} machine instruction as a store to memory.
@end table
v8hi __builtin_ia32_punpcklwd128 (v8hi, v8hi)
v4si __builtin_ia32_punpckldq128 (v4si, v4si)
v2di __builtin_ia32_punpcklqdq128 (v2di, v2di)
-v16qi __builtin_ia32_packsswb128 (v16qi, v16qi)
-v8hi __builtin_ia32_packssdw128 (v8hi, v8hi)
-v16qi __builtin_ia32_packuswb128 (v16qi, v16qi)
+v16qi __builtin_ia32_packsswb128 (v8hi, v8hi)
+v8hi __builtin_ia32_packssdw128 (v4si, v4si)
+v16qi __builtin_ia32_packuswb128 (v8hi, v8hi)
v8hi __builtin_ia32_pmulhuw128 (v8hi, v8hi)
void __builtin_ia32_maskmovdqu (v16qi, v16qi)
v2df __builtin_ia32_loadupd (double *)
void __builtin_ia32_storeupd (double *, v2df)
-v2df __builtin_ia32_loadhpd (v2df, double *)
-v2df __builtin_ia32_loadlpd (v2df, double *)
+v2df __builtin_ia32_loadhpd (v2df, double const *)
+v2df __builtin_ia32_loadlpd (v2df, double const *)
int __builtin_ia32_movmskpd (v2df)
int __builtin_ia32_pmovmskb128 (v16qi)
void __builtin_ia32_movnti (int *, int)
v2si __builtin_ia32_phsubd (v2si, v2si)
v4hi __builtin_ia32_phsubw (v4hi, v4hi)
v4hi __builtin_ia32_phsubsw (v4hi, v4hi)
-v8qi __builtin_ia32_pmaddubsw (v8qi, v8qi)
+v4hi __builtin_ia32_pmaddubsw (v8qi, v8qi)
v4hi __builtin_ia32_pmulhrsw (v4hi, v4hi)
v8qi __builtin_ia32_pshufb (v8qi, v8qi)
v8qi __builtin_ia32_psignb (v8qi, v8qi)
v2si __builtin_ia32_psignd (v2si, v2si)
v4hi __builtin_ia32_psignw (v4hi, v4hi)
-long long __builtin_ia32_palignr (long long, long long, int)
+v1di __builtin_ia32_palignr (v1di, v1di, int)
v8qi __builtin_ia32_pabsb (v8qi)
v2si __builtin_ia32_pabsd (v2si)
v4hi __builtin_ia32_pabsw (v4hi)
v4si __builtin_ia32_phsubd128 (v4si, v4si)
v8hi __builtin_ia32_phsubw128 (v8hi, v8hi)
v8hi __builtin_ia32_phsubsw128 (v8hi, v8hi)
-v16qi __builtin_ia32_pmaddubsw128 (v16qi, v16qi)
+v8hi __builtin_ia32_pmaddubsw128 (v16qi, v16qi)
v8hi __builtin_ia32_pmulhrsw128 (v8hi, v8hi)
v16qi __builtin_ia32_pshufb128 (v16qi, v16qi)
v16qi __builtin_ia32_psignb128 (v16qi, v16qi)
v4si __builtin_ia32_psignd128 (v4si, v4si)
v8hi __builtin_ia32_psignw128 (v8hi, v8hi)
-v2di __builtin_ia32_palignr (v2di, v2di, int)
+v2di __builtin_ia32_palignr128 (v2di, v2di, int)
v16qi __builtin_ia32_pabsb128 (v16qi)
v4si __builtin_ia32_pabsd128 (v4si)
v8hi __builtin_ia32_pabsw128 (v8hi)
Generates the @code{crc32w} machine instruction.
@item unsigned int __builtin_ia32_crc32si (unsigned int, unsigned int)
Generates the @code{crc32l} machine instruction.
-@item unsigned long long __builtin_ia32_crc32di (unsigned int, unsigned long long)
+@item unsigned long long __builtin_ia32_crc32di (unsigned long long, unsigned long long)
@end table
The following built-in functions are changed to generate new SSE4.2
For example, the code above will set the lower half of @code{a} to
@code{1.5} on little-endian targets and @code{9.1} on big-endian targets.
+@node MIPS Loongson Built-in Functions
+@subsection MIPS Loongson Built-in Functions
+
+GCC provides intrinsics to access the SIMD instructions provided by the
+ST Microelectronics Loongson-2E and -2F processors. These intrinsics,
+available after inclusion of the @code{loongson.h} header file,
+operate on the following 64-bit vector types:
+
+@itemize
+@item @code{uint8x8_t}, a vector of eight unsigned 8-bit integers;
+@item @code{uint16x4_t}, a vector of four unsigned 16-bit integers;
+@item @code{uint32x2_t}, a vector of two unsigned 32-bit integers;
+@item @code{int8x8_t}, a vector of eight signed 8-bit integers;
+@item @code{int16x4_t}, a vector of four signed 16-bit integers;
+@item @code{int32x2_t}, a vector of two signed 32-bit integers.
+@end itemize
+
+The intrinsics provided are listed below; each is named after the
+machine instruction to which it corresponds, with suffixes added as
+appropriate to distinguish intrinsics that expand to the same machine
+instruction yet have different argument types. Refer to the architecture
+documentation for a description of the functionality of each
+instruction.
+
+@smallexample
+int16x4_t packsswh (int32x2_t s, int32x2_t t);
+int8x8_t packsshb (int16x4_t s, int16x4_t t);
+uint8x8_t packushb (uint16x4_t s, uint16x4_t t);
+uint32x2_t paddw_u (uint32x2_t s, uint32x2_t t);
+uint16x4_t paddh_u (uint16x4_t s, uint16x4_t t);
+uint8x8_t paddb_u (uint8x8_t s, uint8x8_t t);
+int32x2_t paddw_s (int32x2_t s, int32x2_t t);
+int16x4_t paddh_s (int16x4_t s, int16x4_t t);
+int8x8_t paddb_s (int8x8_t s, int8x8_t t);
+uint64_t paddd_u (uint64_t s, uint64_t t);
+int64_t paddd_s (int64_t s, int64_t t);
+int16x4_t paddsh (int16x4_t s, int16x4_t t);
+int8x8_t paddsb (int8x8_t s, int8x8_t t);
+uint16x4_t paddush (uint16x4_t s, uint16x4_t t);
+uint8x8_t paddusb (uint8x8_t s, uint8x8_t t);
+uint64_t pandn_ud (uint64_t s, uint64_t t);
+uint32x2_t pandn_uw (uint32x2_t s, uint32x2_t t);
+uint16x4_t pandn_uh (uint16x4_t s, uint16x4_t t);
+uint8x8_t pandn_ub (uint8x8_t s, uint8x8_t t);
+int64_t pandn_sd (int64_t s, int64_t t);
+int32x2_t pandn_sw (int32x2_t s, int32x2_t t);
+int16x4_t pandn_sh (int16x4_t s, int16x4_t t);
+int8x8_t pandn_sb (int8x8_t s, int8x8_t t);
+uint16x4_t pavgh (uint16x4_t s, uint16x4_t t);
+uint8x8_t pavgb (uint8x8_t s, uint8x8_t t);
+uint32x2_t pcmpeqw_u (uint32x2_t s, uint32x2_t t);
+uint16x4_t pcmpeqh_u (uint16x4_t s, uint16x4_t t);
+uint8x8_t pcmpeqb_u (uint8x8_t s, uint8x8_t t);
+int32x2_t pcmpeqw_s (int32x2_t s, int32x2_t t);
+int16x4_t pcmpeqh_s (int16x4_t s, int16x4_t t);
+int8x8_t pcmpeqb_s (int8x8_t s, int8x8_t t);
+uint32x2_t pcmpgtw_u (uint32x2_t s, uint32x2_t t);
+uint16x4_t pcmpgth_u (uint16x4_t s, uint16x4_t t);
+uint8x8_t pcmpgtb_u (uint8x8_t s, uint8x8_t t);
+int32x2_t pcmpgtw_s (int32x2_t s, int32x2_t t);
+int16x4_t pcmpgth_s (int16x4_t s, int16x4_t t);
+int8x8_t pcmpgtb_s (int8x8_t s, int8x8_t t);
+uint16x4_t pextrh_u (uint16x4_t s, int field);
+int16x4_t pextrh_s (int16x4_t s, int field);
+uint16x4_t pinsrh_0_u (uint16x4_t s, uint16x4_t t);
+uint16x4_t pinsrh_1_u (uint16x4_t s, uint16x4_t t);
+uint16x4_t pinsrh_2_u (uint16x4_t s, uint16x4_t t);
+uint16x4_t pinsrh_3_u (uint16x4_t s, uint16x4_t t);
+int16x4_t pinsrh_0_s (int16x4_t s, int16x4_t t);
+int16x4_t pinsrh_1_s (int16x4_t s, int16x4_t t);
+int16x4_t pinsrh_2_s (int16x4_t s, int16x4_t t);
+int16x4_t pinsrh_3_s (int16x4_t s, int16x4_t t);
+int32x2_t pmaddhw (int16x4_t s, int16x4_t t);
+int16x4_t pmaxsh (int16x4_t s, int16x4_t t);
+uint8x8_t pmaxub (uint8x8_t s, uint8x8_t t);
+int16x4_t pminsh (int16x4_t s, int16x4_t t);
+uint8x8_t pminub (uint8x8_t s, uint8x8_t t);
+uint8x8_t pmovmskb_u (uint8x8_t s);
+int8x8_t pmovmskb_s (int8x8_t s);
+uint16x4_t pmulhuh (uint16x4_t s, uint16x4_t t);
+int16x4_t pmulhh (int16x4_t s, int16x4_t t);
+int16x4_t pmullh (int16x4_t s, int16x4_t t);
+int64_t pmuluw (uint32x2_t s, uint32x2_t t);
+uint8x8_t pasubub (uint8x8_t s, uint8x8_t t);
+uint16x4_t biadd (uint8x8_t s);
+uint16x4_t psadbh (uint8x8_t s, uint8x8_t t);
+uint16x4_t pshufh_u (uint16x4_t dest, uint16x4_t s, uint8_t order);
+int16x4_t pshufh_s (int16x4_t dest, int16x4_t s, uint8_t order);
+uint16x4_t psllh_u (uint16x4_t s, uint8_t amount);
+int16x4_t psllh_s (int16x4_t s, uint8_t amount);
+uint32x2_t psllw_u (uint32x2_t s, uint8_t amount);
+int32x2_t psllw_s (int32x2_t s, uint8_t amount);
+uint16x4_t psrlh_u (uint16x4_t s, uint8_t amount);
+int16x4_t psrlh_s (int16x4_t s, uint8_t amount);
+uint32x2_t psrlw_u (uint32x2_t s, uint8_t amount);
+int32x2_t psrlw_s (int32x2_t s, uint8_t amount);
+uint16x4_t psrah_u (uint16x4_t s, uint8_t amount);
+int16x4_t psrah_s (int16x4_t s, uint8_t amount);
+uint32x2_t psraw_u (uint32x2_t s, uint8_t amount);
+int32x2_t psraw_s (int32x2_t s, uint8_t amount);
+uint32x2_t psubw_u (uint32x2_t s, uint32x2_t t);
+uint16x4_t psubh_u (uint16x4_t s, uint16x4_t t);
+uint8x8_t psubb_u (uint8x8_t s, uint8x8_t t);
+int32x2_t psubw_s (int32x2_t s, int32x2_t t);
+int16x4_t psubh_s (int16x4_t s, int16x4_t t);
+int8x8_t psubb_s (int8x8_t s, int8x8_t t);
+uint64_t psubd_u (uint64_t s, uint64_t t);
+int64_t psubd_s (int64_t s, int64_t t);
+int16x4_t psubsh (int16x4_t s, int16x4_t t);
+int8x8_t psubsb (int8x8_t s, int8x8_t t);
+uint16x4_t psubush (uint16x4_t s, uint16x4_t t);
+uint8x8_t psubusb (uint8x8_t s, uint8x8_t t);
+uint32x2_t punpckhwd_u (uint32x2_t s, uint32x2_t t);
+uint16x4_t punpckhhw_u (uint16x4_t s, uint16x4_t t);
+uint8x8_t punpckhbh_u (uint8x8_t s, uint8x8_t t);
+int32x2_t punpckhwd_s (int32x2_t s, int32x2_t t);
+int16x4_t punpckhhw_s (int16x4_t s, int16x4_t t);
+int8x8_t punpckhbh_s (int8x8_t s, int8x8_t t);
+uint32x2_t punpcklwd_u (uint32x2_t s, uint32x2_t t);
+uint16x4_t punpcklhw_u (uint16x4_t s, uint16x4_t t);
+uint8x8_t punpcklbh_u (uint8x8_t s, uint8x8_t t);
+int32x2_t punpcklwd_s (int32x2_t s, int32x2_t t);
+int16x4_t punpcklhw_s (int16x4_t s, int16x4_t t);
+int8x8_t punpcklbh_s (int8x8_t s, int8x8_t t);
+@end smallexample
+
@menu
* Paired-Single Arithmetic::
* Paired-Single Built-in Functions::
@item
Compiling with @option{-maltivec} adds keywords @code{__vector},
-@code{__pixel}, and @code{__bool}. Macros @option{vector},
-@code{pixel}, and @code{bool} are defined in @code{<altivec.h>} and can
-be undefined.
+@code{vector}, @code{__pixel}, @code{pixel}, @code{__bool} and
+@code{bool}. When compiling ISO C, the context-sensitive substitution
+of the keywords @code{vector}, @code{pixel} and @code{bool} is
+disabled. To use them, you must include @code{<altivec.h>} instead.
@item
GCC allows using a @code{typedef} name as the type specifier for a
Predefined Macros,cpp,The GNU C Preprocessor}).
@menu
-* Volatiles:: What constitutes an access to a volatile object.
+* Volatiles:: What constitutes an access to a volatile object.
* Restricted Pointers:: C99 restricted pointers and references.
* Vague Linkage:: Where G++ puts inlines, vtables and such.
* C++ Interface:: You can use a single C++ header file for both
@end table
-See also @xref{Namespace Association}.
+See also @ref{Namespace Association}.
@node Namespace Association
@section Namespace Association
Previously it was possible to use an empty prototype parameter list to
indicate an unspecified number of parameters (like C), rather than no
parameters, as C++ demands. This feature has been removed, except where
-it is required for backwards compatibility @xref{Backwards Compatibility}.
+it is required for backwards compatibility. @xref{Backwards Compatibility}.
@end table
G++ allows a virtual function returning @samp{void *} to be overridden
compilation of C++ written to such drafts, G++ contains some backwards
compatibilities. @emph{All such backwards compatibility features are
liable to disappear in future versions of G++.} They should be considered
-deprecated @xref{Deprecated Features}.
+deprecated. @xref{Deprecated Features}.
@table @code
@item For scope
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