@c Copyright (C) 1988,1989,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,
-@c 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+@c 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
@c Free Software Foundation, Inc.
@c This is part of the GCC manual.
@c For copying conditions, see the file gcc.texi.
@defmac MD_EXEC_PREFIX
If defined, this macro is an additional prefix to try after
@code{STANDARD_EXEC_PREFIX}. @code{MD_EXEC_PREFIX} is not searched
-when the @option{-b} option is used, or the compiler is built as a cross
+when the compiler is built as a cross
compiler. If you define @code{MD_EXEC_PREFIX}, then be sure to add it
to the list of directories used to find the assembler in @file{configure.in}.
@end defmac
@defmac MD_STARTFILE_PREFIX
If defined, this macro supplies an additional prefix to try after the
standard prefixes. @code{MD_EXEC_PREFIX} is not searched when the
-@option{-b} option is used, or when the compiler is built as a cross
-compiler.
+compiler is built as a cross compiler.
@end defmac
@defmac MD_STARTFILE_PREFIX_1
If defined, this macro supplies yet another prefix to try after the
-standard prefixes. It is not searched when the @option{-b} option is
-used, or when the compiler is built as a cross compiler.
+standard prefixes. It is not searched when the compiler is built as a
+cross compiler.
@end defmac
@defmac INIT_ENVIRONMENT
target-specific C language family options described by the @file{.opt}
definition files(@pxref{Options}). It has the opportunity to do some
option-specific processing and should return true if the option is
-valid. The default definition does nothing but return false.
+valid. The arguments are like for @code{TARGET_HANDLE_OPTION}. The
+default definition does nothing but return false.
In general, you should use @code{TARGET_HANDLE_OPTION} to handle
options. However, if processing an option requires routines that are
targets.
@end deftypefn
+@deftypefn {Target Hook} {enum machine_mode} TARGET_UNWIND_WORD_MODE (void)
+Return machine mode to be used for @code{_Unwind_Word} type.
+The default is to use @code{word_mode}.
+@end deftypefn
+
@defmac ROUND_TOWARDS_ZERO
If defined, this macro should be true if the prevailing rounding
mode is towards zero.
the highest numbered allocable register first.
@end defmac
-@defmac ORDER_REGS_FOR_LOCAL_ALLOC
+@defmac ADJUST_REG_ALLOC_ORDER
A C statement (sans semicolon) to choose the order in which to allocate
hard registers for pseudo-registers local to a basic block.
On most machines, it is not necessary to define this macro.
@end defmac
+@defmac HONOR_REG_ALLOC_ORDER
+Normally, IRA tries to estimate the costs for saving a register in the
+prologue and restoring it in the epilogue. This discourages it from
+using call-saved registers. If a machine wants to ensure that IRA
+allocates registers in the order given by REG_ALLOC_ORDER even if some
+call-saved registers appear earlier than call-used ones, this macro
+should be defined.
+@end defmac
+
@defmac IRA_HARD_REGNO_ADD_COST_MULTIPLIER (@var{regno})
In some case register allocation order is not enough for the
Integrated Register Allocator (@acronym{IRA}) to generate a good code.
is @code{BITS_PER_WORD} bits wide is correct for your machine.
@end defmac
-@defmac SMALL_REGISTER_CLASSES
-On some machines, it is risky to let hard registers live across arbitrary
-insns. Typically, these machines have instructions that require values
-to be in specific registers (like an accumulator), and reload will fail
-if the required hard register is used for another purpose across such an
-insn.
-
-Define @code{SMALL_REGISTER_CLASSES} to be an expression with a nonzero
-value on these machines. When this macro has a nonzero value, the
-compiler will try to minimize the lifetime of hard registers.
-
-It is always safe to define this macro with a nonzero value, but if you
-unnecessarily define it, you will reduce the amount of optimizations
-that can be performed in some cases. If you do not define this macro
-with a nonzero value when it is required, the compiler will run out of
-spill registers and print a fatal error message. For most machines, you
-should not define this macro at all.
-@end defmac
-
@defmac CLASS_LIKELY_SPILLED_P (@var{class})
A C expression whose value is nonzero if pseudos that have been assigned
to registers of class @var{class} would likely be spilled because
must have move patterns for this mode.
@end deftypefn
+@deftypefn {Target Hook} bool TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P (enum machine_mode @var{mode})
+Define this to return nonzero for machine modes for which the port has
+small register classes. If this target hook returns nonzero for a given
+@var{mode}, the compiler will try to minimize the lifetime of registers
+in @var{mode}. The hook may be called with @code{VOIDmode} as argument.
+In this case, the hook is expected to return nonzero if it returns nonzero
+for any mode.
+
+On some machines, it is risky to let hard registers live across arbitrary
+insns. Typically, these machines have instructions that require values
+to be in specific registers (like an accumulator), and reload will fail
+if the required hard register is used for another purpose across such an
+insn.
+
+Passes before reload do not know which hard registers will be used
+in an instruction, but the machine modes of the registers set or used in
+the instruction are already known. And for some machines, register
+classes are small for, say, integer registers but not for floating point
+registers. For example, the AMD x86-64 architecture requires specific
+registers for the legacy x86 integer instructions, but there are many
+SSE registers for floating point operations. On such targets, a good
+strategy may be to return nonzero from this hook for @code{INTEGRAL_MODE_P}
+machine modes but zero for the SSE register classes.
+
+The default version of this hook retuns false for any mode. It is always
+safe to redefine this hook to return with a nonzero value. But if you
+unnecessarily define it, you will reduce the amount of optimizations
+that can be performed in some cases. If you do not define this hook
+to return a nonzero value when it is required, the compiler will run out
+of spill registers and print a fatal error message.
+@end deftypefn
+
@node Scalar Return
@subsection How Scalar Function Values Are Returned
@cindex return values in registers
If the machine has register windows, so that the caller and the called
function use different registers for the return value, this macro
should recognize only the caller's register numbers.
+
+This macro has been deprecated. Use @code{TARGET_FUNCTION_VALUE_REGNO_P}
+for a new target instead.
@end defmac
+@deftypefn {Target Hook} bool TARGET_FUNCTION_VALUE_REGNO_P (const unsigned int @var{regno})
+A target hook that return @code{true} if @var{regno} is the number of a hard
+register in which the values of called function may come back.
+
+A register whose use for returning values is limited to serving as the
+second of a pair (for a value of type @code{double}, say) need not be
+recognized by this target hook.
+
+If the machine has register windows, so that the caller and the called
+function use different registers for the return value, this target hook
+should recognize only the caller's register numbers.
+
+If this hook is not defined, then FUNCTION_VALUE_REGNO_P will be used.
+@end deftypefn
+
@defmac TARGET_ENUM_VA_LIST (@var{idx}, @var{pname}, @var{ptype})
This target macro is used in function @code{c_common_nodes_and_builtins}
to iterate through the target specific builtin types for va_list. The
@code{widen_mult_hi/lo} idioms will be used.
@end deftypefn
-@deftypefn {Target Hook} tree TARGET_VECTORIZE_BUILTIN_CONVERSION (enum tree_code @var{code}, tree @var{type})
+@deftypefn {Target Hook} int TARGET_VECTORIZE_BUILTIN_VECTORIZATION_COST (bool @var{runtime_test})
+Returns the cost to be added to the overhead involved with executing
+the vectorized version of a loop.
+@end deftypefn
+
+@deftypefn {Target Hook} bool TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE (const_tree @var{type}, bool @var{is_packed})
+Return true if vector alignment is reachable (by peeling N iterations) for the given type.
+@end deftypefn
+
+@deftypefn {Target Hook} tree TARGET_VECTORIZE_BUILTIN_VEC_PERM (tree @var{type}, tree *@var{mask_element_type})
+Target builtin that implements vector permute.
+@end deftypefn
+
+@deftypefn {Target Hook} bool TARGET_VECTORIZE_BUILTIN_VEC_PERM_OK (tree @var{vec_type}, tree @var{mask})
+Return true if a vector created for @code{builtin_vec_perm} is valid.
+@end deftypefn
+
+@deftypefn {Target Hook} tree TARGET_VECTORIZE_BUILTIN_CONVERSION (unsigned @var{code}, tree @var{dest_type}, tree @var{src_type})
This hook should return the DECL of a function that implements conversion of the
-input vector of type @var{type}.
-If @var{type} is an integral type, the result of the conversion is a vector of
-floating-point type of the same size.
-If @var{type} is a floating-point type, the result of the conversion is a vector
-of integral type of the same size.
-@var{code} specifies how the conversion is to be applied
+input vector of type @var{src_type} to type @var{dest_type}.
+The value of @var{code} is one of the enumerators in @code{enum tree_code} and
+specifies how the conversion is to be applied
(truncation, rounding, etc.).
If this hook is defined, the autovectorizer will use the
conversion. Otherwise, it will return @code{NULL_TREE}.
@end deftypefn
-@deftypefn {Target Hook} tree TARGET_VECTORIZE_BUILTIN_VECTORIZED_FUNCTION (enum built_in_function @var{code}, tree @var{vec_type_out}, tree @var{vec_type_in})
-This hook should return the decl of a function that implements the vectorized
-variant of the builtin function with builtin function code @var{code} or
-@code{NULL_TREE} if such a function is not available. The return type of
-the vectorized function shall be of vector type @var{vec_type_out} and the
-argument types should be @var{vec_type_in}.
+@deftypefn {Target Hook} tree TARGET_VECTORIZE_BUILTIN_VECTORIZED_FUNCTION (tree @var{fndecl}, tree @var{vec_type_out}, tree @var{vec_type_in})
+This hook should return the decl of a function that implements the
+vectorized variant of the builtin function with builtin function code
+@var{code} or @code{NULL_TREE} if such a function is not available.
+The value of @var{fndecl} is the builtin function declaration. The
+return type of the vectorized function shall be of vector type
+@var{vec_type_out} and the argument types should be @var{vec_type_in}.
@end deftypefn
@deftypefn {Target Hook} bool TARGET_SUPPORT_VECTOR_MISALIGNMENT (enum machine_mode @var{mode}, const_tree @var{type}, int @var{misalignment}, bool @var{is_packed})
@end smallexample
@end defmac
-@deftypefn {Target Hook} bool TARGET_FIXED_CONDITION_CODE_REGS (unsigned int *, unsigned int *)
+@deftypefn {Target Hook} bool TARGET_FIXED_CONDITION_CODE_REGS (unsigned int *@var{p1}, unsigned int *@var{p2})
On targets which do not use @code{(cc0)}, and which use a hard
register rather than a pseudo-register to hold condition codes, the
regular CSE passes are often not able to identify cases in which the
to enable this pass, and it should set the integers to which its
arguments point to the hard register numbers used for condition codes.
When there is only one such register, as is true on most systems, the
-integer pointed to by the second argument should be set to
+integer pointed to by @var{p2} should be set to
@code{INVALID_REGNUM}.
The default version of this hook returns false.
@end deftypefn
-@deftypefn {Target Hook} enum machine_mode TARGET_CC_MODES_COMPATIBLE (enum machine_mode, enum machine_mode)
+@deftypefn {Target Hook} {enum machine_mode} TARGET_CC_MODES_COMPATIBLE (enum machine_mode @var{m1}, enum machine_mode @var{m2})
On targets which use multiple condition code modes in class
@code{MODE_CC}, it is sometimes the case that a comparison can be
validly done in more than one mode. On such a system, define this
The default is that any ready insns can be chosen to be issued.
@end deftypefn
-@deftypefn {Target Hook} int TARGET_SCHED_DFA_NEW_CYCLE (FILE *, int, rtx, int, int, int *)
+@deftypefn {Target Hook} int TARGET_SCHED_DFA_NEW_CYCLE (FILE *@var{dump}, int @var{verbose}, rtx @var{insn}, int @var{last_clock}, int @var{clock}, int *@var{sort_p})
-This hook is called by the insn scheduler before issuing insn passed
-as the third parameter on given cycle. If the hook returns nonzero,
-the insn is not issued on given processors cycle. Instead of that,
-the processor cycle is advanced. If the value passed through the last
-parameter is zero, the insn ready queue is not sorted on the new cycle
-start as usually. The first parameter passes file for debugging
-output. The second one passes the scheduler verbose level of the
-debugging output. The forth and the fifth parameter values are
-correspondingly processor cycle on which the previous insn has been
-issued and the current processor cycle.
+This hook is called by the insn scheduler before issuing @var{insn}
+on cycle @var{clock}. If the hook returns nonzero,
+@var{insn} is not issued on this processor cycle. Instead,
+the processor cycle is advanced. If *@var{sort_p}
+is zero, the insn ready queue is not sorted on the new cycle
+start as usually. @var{dump} and @var{verbose} specify the file and
+verbosity level to use for debugging output.
+@var{last_clock} and @var{clock} are, respectively, the
+processor cycle on which the previous insn has been issued,
+and the current processor cycle.
@end deftypefn
@deftypefn {Target Hook} bool TARGET_SCHED_IS_COSTLY_DEPENDENCE (struct _dep *@var{_dep}, int @var{cost}, int @var{distance})
@deftypefn {Target Hook} void TARGET_SCHED_INIT_SCHED_CONTEXT (void *@var{tc}, bool @var{clean_p})
Initialize store pointed to by @var{tc} to hold target scheduling context.
It @var{clean_p} is true then initialize @var{tc} as if scheduler is at the
-beginning of the block. Otherwise, make a copy of the current context in
-@var{tc}.
+beginning of the block. Otherwise, copy the current context into @var{tc}.
@end deftypefn
@deftypefn {Target Hook} void TARGET_SCHED_SET_SCHED_CONTEXT (void *@var{tc})
@var{insn} should be generated. In this case @var{label} can't be null.
@end deftypefn
-@deftypefn {Target Hook} int TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD_GUARD_SPEC (rtx @var{insn})
+@deftypefn {Target Hook} bool TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD_GUARD_SPEC (const_rtx @var{insn})
This hook is used as a workaround for
@samp{TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD_GUARD} not being
called on the first instruction of the ready list. The hook is used to
-discard speculative instruction that stand first in the ready list from
-being scheduled on the current cycle. For non-speculative instructions,
-the hook should always return nonzero. For example, in the ia64 backend
+discard speculative instructions that stand first in the ready list from
+being scheduled on the current cycle. If the hook returns @code{false},
+@var{insn} will not be chosen to be issued.
+For non-speculative instructions,
+the hook should always return @code{true}. For example, in the ia64 backend
the hook is used to cancel data speculative insns when the ALAT table
is nearly full.
@end deftypefn
-@deftypefn {Target Hook} void TARGET_SCHED_SET_SCHED_FLAGS (unsigned int *@var{flags}, spec_info_t @var{spec_info})
+@deftypefn {Target Hook} void TARGET_SCHED_SET_SCHED_FLAGS (struct spec_info_def *@var{spec_info})
This hook is used by the insn scheduler to find out what features should be
-enabled/used. @var{flags} initially may have either the SCHED_RGN or SCHED_EBB
-bit set. This denotes the scheduler pass for which the data should be
-provided. The target backend should modify @var{flags} by modifying
-the bits corresponding to the following features: USE_DEPS_LIST, USE_GLAT,
-DETACH_LIFE_INFO, and DO_SPECULATION@. For the DO_SPECULATION feature
-an additional structure @var{spec_info} should be filled by the target.
+enabled/used.
+The structure *@var{spec_info} should be filled in by the target.
The structure describes speculation types that can be used in the scheduler.
@end deftypefn
uninitialized, writable small data.
@end defmac
+@defmac TLS_COMMON_ASM_OP
+If defined, a C expression whose value is a string containing the
+assembler operation to identify the following data as thread-local
+common data. The default is @code{".tls_common"}.
+@end defmac
+
+@defmac TLS_SECTION_ASM_FLAG
+If defined, a C expression whose value is a character constant
+containing the flag used to mark a section as a TLS section. The
+default is @code{'T'}.
+@end defmac
+
@defmac INIT_SECTION_ASM_OP
If defined, a C expression whose value is a string, including spacing,
containing the assembler operation to identify the following data as
this function.
@end deftypefun
+@deftypefn {Target Hook} void TARGET_ASM_CODE_END (void)
+Output to @code{asm_out_file} any text which is needed before emitting
+unwind info and debug info at the end of a file. Some targets emit
+here PIC setup thunks that cannot be emitted at the end of file,
+because they couldn't have unwind info then. The default is to output
+nothing.
+@end deftypefn
+
@defmac ASM_COMMENT_START
A C string constant describing how to begin a comment in the target
assembler language. The compiler assumes that the comment will end at
spaces are new keywords that are similar to the @code{volatile} and
@code{const} type attributes.
-Pointers to named address spaces can a a different size than
+Pointers to named address spaces can have a different size than
pointers to the generic address space.
For example, the SPU port uses the @code{__ea} address space to refer
unsigned one.
@end defmac
-@deftypefn {Target Hook} int TARGET_MIN_DIVISIONS_FOR_RECIP_MUL (enum machine_mode @var{mode})
+@deftypefn {Target Hook} {unsigned int} TARGET_MIN_DIVISIONS_FOR_RECIP_MUL (enum machine_mode @var{mode})
When @option{-ffast-math} is in effect, GCC tries to optimize
divisions by the same divisor, by turning them into multiplications by
the reciprocal. This target hook specifies the minimum number of divisions
built-in function.
@end deftypefn
-@deftypefn {Target Hook} tree TARGET_RESOLVE_OVERLOADED_BUILTIN (tree @var{fndecl}, tree @var{arglist})
+@deftypefn {Target Hook} tree TARGET_RESOLVE_OVERLOADED_BUILTIN (unsigned int @var{loc}, tree @var{fndecl}, void *@var{arglist})
Select a replacement for a machine specific built-in function that
was set up by @samp{TARGET_INIT_BUILTINS}. This is done
arguments passed to the built-in function. The result is a
complete expression that implements the operation, usually
another @code{CALL_EXPR}.
+@var{arglist} really has type @samp{VEC(tree,gc)*}
@end deftypefn
@deftypefn {Target Hook} tree TARGET_FOLD_BUILTIN (tree @var{fndecl}, tree @var{arglist}, bool @var{ignore})
modes and they have different conditional execution capability, such as ARM.
@end deftypefn
+@deftypefn {Target Hook} unsigned TARGET_LOOP_UNROLL_ADJUST (unsigned @var{nunroll}, struct loop *@var{loop})
+This target hook returns a new value for the number of times @var{loop}
+should be unrolled. The parameter @var{nunroll} is the number of times
+the loop is to be unrolled. The parameter @var{loop} is a pointer to
+the loop, which is going to be checked for unrolling. This target hook
+is required only when the target has special constraints like maximum
+number of memory accesses.
+@end deftypefn
+
@defmac POWI_MAX_MULTS
If defined, this macro is interpreted as a signed integer C expression
that specifies the maximum number of floating point multiplications
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