additional options.
@end defmac
-@defmac SWITCH_CURTAILS_COMPILATION (@var{char})
-A C expression which determines whether the option @option{-@var{char}}
-stops compilation before the generation of an executable. The value is
-boolean, nonzero if the option does stop an executable from being
-generated, zero otherwise.
-
-By default, this macro is defined as
-@code{DEFAULT_SWITCH_CURTAILS_COMPILATION}, which handles the standard
-options properly. You need not define
-@code{SWITCH_CURTAILS_COMPILATION} unless you wish to add additional
-options which affect the generation of an executable. Any redefinition
-should call @code{DEFAULT_SWITCH_CURTAILS_COMPILATION} and then check
-for additional options.
-@end defmac
-
@defmac TARGET_OPTION_TRANSLATE_TABLE
If defined, a list of pairs of strings, the first of which is a
potential command line target to the @file{gcc} driver program, and the
should use @code{TARGET_HANDLE_C_OPTION} instead.
@end deftypefn
+@deftypefn {Target Hook} tree TARGET_OBJC_CONSTRUCT_STRING (tree @var{string})
+Construct a constant string representation for @var{string}
+@end deftypefn
+
@defmac TARGET_VERSION
This macro is a C statement to print on @code{stderr} a string
describing the particular machine description choice. Every machine
@end smallexample
@end defmac
-@defmac OVERRIDE_OPTIONS
-Sometimes certain combinations of command options do not make sense on
-a particular target machine. You can define a macro
-@code{OVERRIDE_OPTIONS} to take account of this. This macro, if
-defined, is executed once just after all the command options have been
-parsed.
-
-Don't use this macro to turn on various extra optimizations for
-@option{-O}. That is what @code{OPTIMIZATION_OPTIONS} is for.
-
-If you need to do something whenever the optimization level is
-changed via the optimize attribute or pragma, see
-@code{TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE}
-
-This macros is obsolete, new ports should use the target hook
-@code{TARGET_OPTION_OVERRIDE} instead.
-@end defmac
-
@deftypefn {Target Hook} void TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE (void)
This target function is similar to the hook @code{TARGET_OPTION_OVERRIDE}
but is called when the optimize level is changed via an attribute or
@end deftypefn
@defmac C_COMMON_OVERRIDE_OPTIONS
-This is similar to @code{OVERRIDE_OPTIONS} but is only used in the C
+This is similar to the @code{TARGET_OPTION_OVERRIDE} hook
+but is only used in the C
language frontends (C, Objective-C, C++, Objective-C++) and so can be
used to alter option flag variables which only exist in those
frontends.
@end defmac
-@defmac OPTIMIZATION_OPTIONS (@var{level}, @var{size})
+@deftypevr {Target Hook} {const struct default_options *} TARGET_OPTION_OPTIMIZATION_TABLE
Some machines may desire to change what optimizations are performed for
-various optimization levels. This macro, if defined, is executed once
+various optimization levels. This variable, if defined, describes
+options to enable at particular sets of optimization levels. These
+options are processed once
just after the optimization level is determined and before the remainder
-of the command options have been parsed. Values set in this macro are
-used as the default values for the other command line options.
-
-@var{level} is the optimization level specified; 2 if @option{-O2} is
-specified, 1 if @option{-O} is specified, and 0 if neither is specified.
+of the command options have been parsed, so may be overridden by other
+options passed explicily.
-@var{size} is nonzero if @option{-Os} is specified and zero otherwise.
-
-This macro is run once at program startup and when the optimization
+This processing is run once at program startup and when the optimization
options are changed via @code{#pragma GCC optimize} or by using the
@code{optimize} attribute.
+@end deftypevr
-@strong{Do not examine @code{write_symbols} in
-this macro!} The debugging options are not supposed to alter the
-generated code.
-@end defmac
+@deftypefn {Target Hook} void TARGET_OPTION_INIT_STRUCT (struct gcc_options *@var{opts})
+Set target-dependent initial values of fields in @var{opts}.
+@end deftypefn
+
+@deftypefn {Target Hook} void TARGET_OPTION_DEFAULT_PARAMS (void)
+Set target-dependent default values for @option{--param} settings, using calls to @code{set_default_param_value}.
+@end deftypefn
@deftypefn {Target Hook} void TARGET_HELP (void)
This hook is called in response to the user invoking
line options found in its @file{.opt} file.
@end deftypefn
-@defmac CAN_DEBUG_WITHOUT_FP
-Define this macro if debugging can be performed even without a frame
-pointer. If this macro is defined, GCC will turn on the
-@option{-fomit-frame-pointer} option whenever @option{-O} is specified.
-@end defmac
-
@defmac SWITCHABLE_TARGET
Some targets need to switch between substantially different subtargets
during compilation. For example, the MIPS target has one subtarget for
macro need not be a constant.
@end defmac
-@defmac LIBGCC2_WORDS_BIG_ENDIAN
-Define this macro if @code{WORDS_BIG_ENDIAN} is not constant. This must be a
-constant value with the same meaning as @code{WORDS_BIG_ENDIAN}, which will be
-used only when compiling @file{libgcc2.c}. Typically the value will be set
-based on preprocessor defines.
-@end defmac
-
@defmac FLOAT_WORDS_BIG_ENDIAN
Define this macro to have the value 1 if @code{DFmode}, @code{XFmode} or
@code{TFmode} floating point numbers are stored in memory with the word
smallest value that @code{UNITS_PER_WORD} can have at run-time.
@end defmac
-@defmac UNITS_PER_SIMD_WORD (@var{mode})
-Number of units in the vectors that the vectorizer can produce for
-scalar mode @var{mode}. The default is equal to @code{UNITS_PER_WORD},
-because the vectorizer can do some transformations even in absence of
-specialized @acronym{SIMD} hardware.
-@end defmac
-
@defmac POINTER_SIZE
Width of a pointer, in bits. You must specify a value no wider than the
width of @code{Pmode}. If it is not equal to the width of @code{Pmode},
@end defmac
@defmac LIBGCC2_HAS_DF_MODE
-Define this macro if neither @code{LIBGCC2_DOUBLE_TYPE_SIZE} nor
+Define this macro if neither @code{DOUBLE_TYPE_SIZE} nor
@code{LIBGCC2_LONG_DOUBLE_TYPE_SIZE} is
@code{DFmode} but you want @code{DFmode} routines in @file{libgcc2.a}
-anyway. If you don't define this and either @code{LIBGCC2_DOUBLE_TYPE_SIZE}
+anyway. If you don't define this and either @code{DOUBLE_TYPE_SIZE}
or @code{LIBGCC2_LONG_DOUBLE_TYPE_SIZE} is 64 then the default is 1,
otherwise it is 0.
@end defmac
@code{FLT_MANT_DIG} is used for @code{SF_SIZE}, @code{LDBL_MANT_DIG}
for @code{XF_SIZE} and @code{TF_SIZE}, and @code{DBL_MANT_DIG} or
@code{LDBL_MANT_DIG} for @code{DF_SIZE} according to whether
-@code{LIBGCC2_DOUBLE_TYPE_SIZE} or
+@code{DOUBLE_TYPE_SIZE} or
@code{LIBGCC2_LONG_DOUBLE_TYPE_SIZE} is 64.
@end defmac
This macro also has strict and non-strict variants.
@end defmac
+@deftypefn {Target Hook} reg_class_t TARGET_PREFERRED_RELOAD_CLASS (rtx @var{x}, reg_class_t @var{rclass})
+A target hook that places additional restrictions on the register class
+to use when it is necessary to copy value @var{x} into a register in class
+@var{rclass}. The value is a register class; perhaps @var{rclass}, or perhaps
+another, smaller class.
+
+The default version of this hook always returns value of @code{rclass} argument.
+
+Sometimes returning a more restrictive class makes better code. For
+example, on the 68000, when @var{x} is an integer constant that is in range
+for a @samp{moveq} instruction, the value of this macro is always
+@code{DATA_REGS} as long as @var{rclass} includes the data registers.
+Requiring a data register guarantees that a @samp{moveq} will be used.
+
+One case where @code{TARGET_PREFERRED_RELOAD_CLASS} must not return
+@var{rclass} is if @var{x} is a legitimate constant which cannot be
+loaded into some register class. By returning @code{NO_REGS} you can
+force @var{x} into a memory location. For example, rs6000 can load
+immediate values into general-purpose registers, but does not have an
+instruction for loading an immediate value into a floating-point
+register, so @code{TARGET_PREFERRED_RELOAD_CLASS} returns @code{NO_REGS} when
+@var{x} is a floating-point constant. If the constant can't be loaded
+into any kind of register, code generation will be better if
+@code{LEGITIMATE_CONSTANT_P} makes the constant illegitimate instead
+of using @code{TARGET_PREFERRED_RELOAD_CLASS}.
+
+If an insn has pseudos in it after register allocation, reload will go
+through the alternatives and call repeatedly @code{TARGET_PREFERRED_RELOAD_CLASS}
+to find the best one. Returning @code{NO_REGS}, in this case, makes
+reload add a @code{!} in front of the constraint: the x86 back-end uses
+this feature to discourage usage of 387 registers when math is done in
+the SSE registers (and vice versa).
+@end deftypefn
+
@defmac PREFERRED_RELOAD_CLASS (@var{x}, @var{class})
A C expression that places additional restrictions on the register class
to use when it is necessary to copy value @var{x} into a register in class
reload from using some alternatives, like @code{PREFERRED_RELOAD_CLASS}.
@end defmac
+@deftypefn {Target Hook} reg_class_t TARGET_PREFERRED_OUTPUT_RELOAD_CLASS (rtx @var{x}, reg_class_t @var{rclass})
+Like @code{TARGET_PREFERRED_RELOAD_CLASS}, but for output reloads instead of
+input reloads.
+
+The default version of this hook always returns value of @code{rclass}
+argument.
+
+You can also use @code{TARGET_PREFERRED_OUTPUT_RELOAD_CLASS} to discourage
+reload from using some alternatives, like @code{TARGET_PREFERRED_RELOAD_CLASS}.
+@end deftypefn
+
@defmac LIMIT_RELOAD_CLASS (@var{mode}, @var{class})
A C expression that places additional restrictions on the register class
to use when it is necessary to be able to hold a value of mode
is @code{BITS_PER_WORD} bits wide is correct for your machine.
@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
-registers of @var{class} are needed for spill registers.
+@deftypefn {Target Hook} bool TARGET_CLASS_LIKELY_SPILLED_P (reg_class_t @var{rclass})
+A target hook which returns @code{true} if pseudos that have been assigned
+to registers of class @var{rclass} would likely be spilled because
+registers of @var{rclass} are needed for spill registers.
-The default value of this macro returns 1 if @var{class} has exactly one
-register and zero otherwise. On most machines, this default should be
-used. Only define this macro to some other expression if pseudos
-allocated by @file{local-alloc.c} end up in memory because their hard
-registers were needed for spill registers. If this macro returns nonzero
-for those classes, those pseudos will only be allocated by
+The default version of this target hook returns @code{true} if @var{rclass}
+has exactly one register and @code{false} otherwise. On most machines, this
+default should be used. Only use this target hook to some other expression
+if pseudos allocated by @file{local-alloc.c} end up in memory because their
+hard registers were needed for spill registers. If this target hook returns
+@code{false} for those classes, those pseudos will only be allocated by
@file{global.c}, which knows how to reallocate the pseudo to another
-register. If there would not be another register available for
-reallocation, you should not change the definition of this macro since
-the only effect of such a definition would be to slow down register
+register. If there would not be another register available for reallocation,
+you should not change the implementation of this target hook since
+the only effect of such implementation would be to slow down register
allocation.
-@end defmac
+@end deftypefn
@defmac CLASS_MAX_NREGS (@var{class}, @var{mode})
A C expression for the maximum number of consecutive registers
(@pxref{Elimination}).
@end defmac
+@defmac HARD_FRAME_POINTER_IS_FRAME_POINTER
+Define this to a preprocessor constant that is nonzero if
+@code{hard_frame_pointer_rtx} and @code{frame_pointer_rtx} should be
+the same. The default definition is @samp{(HARD_FRAME_POINTER_REGNUM
+== FRAME_POINTER_REGNUM)}; you only need to define this macro if that
+definition is not suitable for use in preprocessor conditionals.
+@end defmac
+
+@defmac HARD_FRAME_POINTER_IS_ARG_POINTER
+Define this to a preprocessor constant that is nonzero if
+@code{hard_frame_pointer_rtx} and @code{arg_pointer_rtx} should be the
+same. The default definition is @samp{(HARD_FRAME_POINTER_REGNUM ==
+ARG_POINTER_REGNUM)}; you only need to define this macro if that
+definition is not suitable for use in preprocessor conditionals.
+@end defmac
+
@defmac RETURN_ADDRESS_POINTER_REGNUM
The register number of the return address pointer register, which is used to
access the current function's return address from the stack. On some
normally defined in @file{libgcc2.c}.
@end deftypefn
+@deftypefn {Target Hook} bool TARGET_SUPPORTS_SPLIT_STACK (bool)
+Whether this target supports splitting the stack. This is called after options have been parsed, so the target may reject splitting the stack in some configurations. The default version of this hook returns false. If @var{report} is true, this function may issue a warning or error; if @var{report} is false, it must simply return a value
+@end deftypefn
+
@node Varargs
@section Implementing the Varargs Macros
@cindex varargs implementation
@c 10feb93
@end defmac
-@defmac __builtin_args_info (@var{category})
-Use this built-in function to find the first anonymous arguments in
-registers.
-
-In general, a machine may have several categories of registers used for
-arguments, each for a particular category of data types. (For example,
-on some machines, floating-point registers are used for floating-point
-arguments while other arguments are passed in the general registers.)
-To make non-varargs functions use the proper calling convention, you
-have defined the @code{CUMULATIVE_ARGS} data type to record how many
-registers in each category have been used so far
-
-@code{__builtin_args_info} accesses the same data structure of type
-@code{CUMULATIVE_ARGS} after the ordinary argument layout is finished
-with it, with @var{category} specifying which word to access. Thus, the
-value indicates the first unused register in a given category.
-
-Normally, you would use @code{__builtin_args_info} in the implementation
-of @code{va_start}, accessing each category just once and storing the
-value in the @code{va_list} object. This is because @code{va_list} will
-have to update the values, and there is no way to alter the
-values accessed by @code{__builtin_args_info}.
-@end defmac
-
@defmac __builtin_next_arg (@var{lastarg})
-This is the equivalent of @code{__builtin_args_info}, for stack
-arguments. It returns the address of the first anonymous stack
+This builtin returns the address of the first anonymous stack
argument, as type @code{void *}. If @code{ARGS_GROW_DOWNWARD}, it
returns the address of the location above the first anonymous stack
argument. Use it in @code{va_start} to initialize the pointer for
parameter is true if the memory access is defined in a packed struct.
@end deftypefn
+@deftypefn {Target Hook} {enum machine_mode} TARGET_VECTORIZE_PREFERRED_SIMD_MODE (enum machine_mode @var{mode})
+This hook should return the preferred mode for vectorizing scalar
+mode @var{mode}. The default is
+equal to @code{word_mode}, because the vectorizer can do some
+transformations even in absence of specialized @acronym{SIMD} hardware.
+@end deftypefn
+
+@deftypefn {Target Hook} {unsigned int} TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES (void)
+This hook should return a mask of sizes that should be iterated over
+after trying to autovectorize using the vector size derived from the
+mode returned by @code{TARGET_VECTORIZE_PREFERRED_SIMD_MODE}.
+The default is zero which means to not iterate over other vector sizes.
+@end deftypefn
+
@node Anchored Addresses
@section Anchored Addresses
@cindex anchored addresses
of instructions divided by the issue rate.
@end deftypefn
+@deftypefn {Target Hook} bool TARGET_SCHED_DISPATCH (rtx @var{insn}, int @var{x})
+This hook is called by Haifa Scheduler. It returns true if dispatch scheduling
+is supported in hardware and the condition specified in the parameter is true.
+@end deftypefn
+
+@deftypefn {Target Hook} void TARGET_SCHED_DISPATCH_DO (rtx @var{insn}, int @var{x})
+This hook is called by Haifa Scheduler. It performs the operation specified
+in its second parameter.
+@end deftypefn
+
@node Sections
@section Dividing the Output into Sections (Texts, Data, @dots{})
@c the above section title is WAY too long. maybe cut the part between
``small data'' into a separate section. The default value is false.
@end deftypevr
+@deftypefn {Target Hook} bool TARGET_PROFILE_BEFORE_PROLOGUE (void)
+It returns true if target wants profile code emitted before prologue.
+
+The default version of this hook use the target macro
+@code{PROFILE_BEFORE_PROLOGUE}.
+@end deftypefn
+
@deftypefn {Target Hook} bool TARGET_BINDS_LOCAL_P (const_tree @var{exp})
Returns true if @var{exp} names an object for which name resolution
rules must resolve to the current ``module'' (dynamic shared library
@end defmac
@defmac PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
-Define this macro if the register defined by
-@code{PIC_OFFSET_TABLE_REGNUM} is clobbered by calls. Do not define
+A C expression that is nonzero if the register defined by
+@code{PIC_OFFSET_TABLE_REGNUM} is clobbered by calls. If not defined,
+the default is zero. Do not define
this macro if @code{PIC_OFFSET_TABLE_REGNUM} is not defined.
@end defmac
for the file format in use is appropriate.
@end defmac
+@deftypefn {Target Hook} void TARGET_ASM_OUTPUT_SOURCE_FILENAME (FILE *@var{file}, const char *@var{name})
+Output COFF information or DWARF debugging information which indicates that filename @var{name} is the current source file to the stdio stream @var{file}.
+
+ This target hook need not be defined if the standard form of output for the file format in use is appropriate.
+@end deftypefn
+
@defmac OUTPUT_QUOTED_STRING (@var{stream}, @var{string})
A C statement to output the string @var{string} to the stdio stream
@var{stream}. If you do not call the function @code{output_quoted_string}
when the relevant string is @code{NULL}.
@end deftypefn
+@deftypefn {Target Hook} bool TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA (FILE *@var{file}, rtx @var{x})
+A target hook to recognize @var{rtx} patterns that @code{output_addr_const}
+can't deal with, and output assembly code to @var{file} corresponding to
+the pattern @var{x}. This may be used to allow machine-dependent
+@code{UNSPEC}s to appear within constants.
+
+If target hook fails to recognize a pattern, it must return @code{false},
+so that a standard error message is printed. If it prints an error message
+itself, by calling, for example, @code{output_operand_lossage}, it may just
+return @code{true}.
+@end deftypefn
+
@defmac OUTPUT_ADDR_CONST_EXTRA (@var{stream}, @var{x}, @var{fail})
A C statement to recognize @var{rtx} patterns that
@code{output_addr_const} can't deal with, and output assembly code to
@end defmac
@defmac SUPPORTS_WEAK
-A C expression which evaluates to true if the target supports weak symbols.
+A preprocessor constant expression which evaluates to true if the target
+supports weak symbols.
If you don't define this macro, @file{defaults.h} provides a default
definition. If either @code{ASM_WEAKEN_LABEL} or @code{ASM_WEAKEN_DECL}
-is defined, the default definition is @samp{1}; otherwise, it is
-@samp{0}. Define this macro if you want to control weak symbol support
-with a compiler flag such as @option{-melf}.
+is defined, the default definition is @samp{1}; otherwise, it is @samp{0}.
+@end defmac
+
+@defmac TARGET_SUPPORTS_WEAK
+A C expression which evaluates to true if the target supports weak symbols.
+
+If you don't define this macro, @file{defaults.h} provides a default
+definition. The default definition is @samp{(SUPPORTS_WEAK)}. Define
+this macro if you want to control weak symbol support with a compiler
+flag such as @option{-melf}.
@end defmac
@defmac MAKE_DECL_ONE_ONLY (@var{decl})
The default is that no label is emitted.
@end deftypefn
+@deftypefn {Target Hook} void TARGET_ASM_EMIT_EXCEPT_PERSONALITY (rtx @var{personality})
+If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be used to emit a directive to install a personality hook into the unwind info. This hook should not be used if dwarf2 unwind info is used.
+@end deftypefn
+
@deftypefn {Target Hook} void TARGET_ASM_UNWIND_EMIT (FILE *@var{stream}, rtx @var{insn})
This target hook emits assembly directives required to unwind the
-given instruction. This is only used when TARGET_UNWIND_INFO is set.
+given instruction. This is only used when @code{TARGET_EXCEPT_UNWIND_INFO}
+returns @code{UI_TARGET}.
@end deftypefn
+@deftypevr {Target Hook} bool TARGET_ASM_UNWIND_EMIT_BEFORE_INSN
+True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before the assembly for @var{insn} has been emitted, false if the hook should be called afterward.
+@end deftypevr
+
@node Exception Region Output
@subsection Assembler Commands for Exception Regions
Define this macro to 0 if your target supports DWARF 2 frame unwind
information, but it does not yet work with exception handling.
Otherwise, if your target supports this information (if it defines
-@samp{INCOMING_RETURN_ADDR_RTX} and either @samp{UNALIGNED_INT_ASM_OP}
-or @samp{OBJECT_FORMAT_ELF}), GCC will provide a default definition of 1.
+@code{INCOMING_RETURN_ADDR_RTX} and either @code{UNALIGNED_INT_ASM_OP}
+or @code{OBJECT_FORMAT_ELF}), GCC will provide a default definition of 1.
+@end defmac
-If @code{TARGET_UNWIND_INFO} is defined, the target specific unwinder
-will be used in all cases. Defining this macro will enable the generation
-of DWARF 2 frame debugging information.
+@deftypefn {Target Hook} {enum unwind_info_type} TARGET_EXCEPT_UNWIND_INFO (void)
+This hook defines the mechanism that will be used for exception handling
+by the target. If the target has ABI specified unwind tables, the hook
+should return @code{UI_TARGET}. If the target is to use the
+@code{setjmp}/@code{longjmp}-based exception handling scheme, the hook
+should return @code{UI_SJLJ}. If the target supports DWARF 2 frame unwind
+information, the hook should return @code{UI_DWARF2}.
-If @code{TARGET_UNWIND_INFO} is not defined, and this macro is defined to 1,
-the DWARF 2 unwinder will be the default exception handling mechanism;
-otherwise, the @code{setjmp}/@code{longjmp}-based scheme will be used by
-default.
-@end defmac
+A target may, if exceptions are disabled, choose to return @code{UI_NONE}.
+This may end up simplifying other parts of target-specific code. The
+default implementation of this hook never returns @code{UI_NONE}.
-@defmac TARGET_UNWIND_INFO
-Define this macro if your target has ABI specified unwind tables. Usually
-these will be output by @code{TARGET_ASM_UNWIND_EMIT}.
-@end defmac
+Note that the value returned by this hook should be constant. It should
+not depend on anything except command-line switches. In particular, the
+setting @code{UI_SJLJ} must be fixed at compiler start-up as C pre-processor
+macros and builtin functions related to exception handling are set up
+depending on this setting.
+
+The default implementation of the hook first honors the
+@option{--enable-sjlj-exceptions} configure option, then
+@code{DWARF2_UNWIND_INFO}, and finally defaults to @code{UI_SJLJ}.
+@end deftypefn
@deftypevr {Target Hook} bool TARGET_UNWIND_TABLES_DEFAULT
This variable should be set to @code{true} if the target ABI requires unwinding
selection in @var{align_jumps} in a @code{JUMP_ALIGN} implementation.
@end defmac
+@deftypefn {Target Hook} int TARGET_ASM_JUMP_ALIGN_MAX_SKIP (rtx @var{label})
+The maximum number of bytes to skip before @var{label} when applying
+@code{JUMP_ALIGN}. This works only if
+@code{ASM_OUTPUT_MAX_SKIP_ALIGN} is defined.
+@end deftypefn
+
@defmac LABEL_ALIGN_AFTER_BARRIER (@var{label})
The alignment (log base 2) to put in front of @var{label}, which follows
a @code{BARRIER}.
define the macro.
@end defmac
-@defmac LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
-The maximum number of bytes to skip when applying
+@deftypefn {Target Hook} int TARGET_ASM_LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP (rtx @var{label})
+The maximum number of bytes to skip before @var{label} when applying
@code{LABEL_ALIGN_AFTER_BARRIER}. This works only if
@code{ASM_OUTPUT_MAX_SKIP_ALIGN} is defined.
-@end defmac
+@end deftypefn
@defmac LOOP_ALIGN (@var{label})
The alignment (log base 2) to put in front of @var{label}, which follows
selection in @code{align_loops} in a @code{LOOP_ALIGN} implementation.
@end defmac
-@defmac LOOP_ALIGN_MAX_SKIP
-The maximum number of bytes to skip when applying @code{LOOP_ALIGN}.
-This works only if @code{ASM_OUTPUT_MAX_SKIP_ALIGN} is defined.
-@end defmac
+@deftypefn {Target Hook} int TARGET_ASM_LOOP_ALIGN_MAX_SKIP (rtx @var{label})
+The maximum number of bytes to skip when applying @code{LOOP_ALIGN} to
+@var{label}. This works only if @code{ASM_OUTPUT_MAX_SKIP_ALIGN} is
+defined.
+@end deftypefn
@defmac LABEL_ALIGN (@var{label})
The alignment (log base 2) to put in front of @var{label}.
selection in @code{align_labels} in a @code{LABEL_ALIGN} implementation.
@end defmac
-@defmac LABEL_ALIGN_MAX_SKIP
-The maximum number of bytes to skip when applying @code{LABEL_ALIGN}.
-This works only if @code{ASM_OUTPUT_MAX_SKIP_ALIGN} is defined.
-@end defmac
+@deftypefn {Target Hook} int TARGET_ASM_LABEL_ALIGN_MAX_SKIP (rtx @var{label})
+The maximum number of bytes to skip when applying @code{LABEL_ALIGN}
+to @var{label}. This works only if @code{ASM_OUTPUT_MAX_SKIP_ALIGN}
+is defined.
+@end deftypefn
@defmac ASM_OUTPUT_SKIP (@var{stream}, @var{nbytes})
A C statement to output to the stdio stream @var{stream} an assembler
@defmac DWARF2_FRAME_INFO
Define this macro to a nonzero value if GCC should always output
-Dwarf 2 frame information. If @code{DWARF2_UNWIND_INFO}
-(@pxref{Exception Region Output} is nonzero, GCC will output this
-information not matter how you define @code{DWARF2_FRAME_INFO}.
+Dwarf 2 frame information. If @code{TARGET_EXCEPT_UNWIND_INFO}
+(@pxref{Exception Region Output}) returns @code{UI_DWARF2}, and
+exceptions are enabled, GCC will output this information not matter
+how you define @code{DWARF2_FRAME_INFO}.
@end defmac
+@deftypefn {Target Hook} {enum unwind_info_type} TARGET_DEBUG_UNWIND_INFO (void)
+This hook defines the mechanism that will be used for describing frame
+unwind information to the debugger. Normally the hook will return
+@code{UI_DWARF2} if DWARF 2 debug information is enabled, and
+return @code{UI_NONE} otherwise.
+
+A target may return @code{UI_DWARF2} even when DWARF 2 debug information
+is disabled in order to always output DWARF 2 frame information.
+
+A target may return @code{UI_TARGET} if it has ABI specified unwind tables.
+This will suppress generation of the normal debug frame unwind information.
+@end deftypefn
+
@defmac DWARF2_ASM_LINE_DEBUG_INFO
Define this macro to be a nonzero value if the assembler can generate Dwarf 2
line debug info sections. This will result in much more compact line number
in response to the @option{-g} option. The default behavior for VMS
is to generate minimal debug info for a traceback in the absence of
@option{-g} unless explicitly overridden with @option{-g0}. This
-behavior is controlled by @code{OPTIMIZATION_OPTIONS} and
+behavior is controlled by @code{TARGET_OPTION_OPTIMIZATION} and
@code{TARGET_OPTION_OVERRIDE}.
@end defmac
once just after all the command options have been parsed.
Don't use this hook to turn on various extra optimizations for
-@option{-O}. That is what @code{OPTIMIZATION_OPTIONS} is for.
+@option{-O}. That is what @code{TARGET_OPTION_OPTIMIZATION} is for.
If you need to do something whenever the optimization level is
changed via the optimize attribute or pragma, see
@defmac MATH_LIBRARY
Define this macro as a C string constant for the linker argument to link
-in the system math library, or @samp{""} if the target does not have a
+in the system math library, minus the initial @samp{"-l"}, or
+@samp{""} if the target does not have a
separate math library.
-You need only define this macro if the default of @samp{"-lm"} is wrong.
+You need only define this macro if the default of @samp{"m"} is wrong.
@end defmac
@defmac LIBRARY_PATH_ENV
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