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
frontends.
@end defmac
-@deftypefn {Target Hook} void TARGET_OPTION_OPTIMIZATION (int @var{level}, int @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 hook, 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.
-
-@var{size} is nonzero if @option{-Os} is specified and zero otherwise.
+of the command options have been parsed, so may be overridden by other
+options passed explicily.
-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
+
+@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
-@strong{Do not examine @code{write_symbols} in
-this hook!} The debugging options are not supposed to alter the
-generated code.
+@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)
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
@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
allocation.
@end deftypefn
-@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.
-
-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
-@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
-allocation.
-@end defmac
-
@defmac CLASS_MAX_NREGS (@var{class}, @var{mode})
A C expression for the maximum number of consecutive registers
of class @var{class} needed to hold a value of mode @var{mode}.
parameter is true if the memory access is defined in a packed struct.
@end deftypefn
-@deftypefn {Target Hook} {unsigned int} TARGET_VECTORIZE_UNITS_PER_SIMD_WORD (enum machine_mode @var{mode})
-This hook should return th 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
+@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
@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})
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
OSDN Git Service
