@item
The environment variable @code{GCC_EXEC_PREFIX} or, if @code{GCC_EXEC_PREFIX}
-is not set and the compiler has not been installed in the configure-time
+is not set and the compiler has not been installed in the configure-time
@var{prefix}, the location in which the compiler has actually been installed.
@item
@item
The macro @code{STANDARD_EXEC_PREFIX}, if the compiler has been installed
-in the configured-time @var{prefix}.
+in the configured-time @var{prefix}.
@item
-The location @file{/usr/libexec/gcc/}, but only if this is a native compiler.
+The location @file{/usr/libexec/gcc/}, but only if this is a native compiler.
@item
-The location @file{/usr/lib/gcc/}, but only if this is a native compiler.
+The location @file{/usr/lib/gcc/}, but only if this is a native compiler.
@item
-The macro @code{MD_EXEC_PREFIX}, if defined, but only if this is a native
+The macro @code{MD_EXEC_PREFIX}, if defined, but only if this is a native
compiler.
@end enumerate
@item
The macro @code{STANDARD_EXEC_PREFIX}, but only if the toolchain is installed
-in the configured @var{prefix} or this is a native compiler.
+in the configured @var{prefix} or this is a native compiler.
@item
The location @file{/usr/lib/gcc/}, but only if this is a native compiler.
@item
-The macro @code{MD_EXEC_PREFIX}, if defined, but only if this is a native
+The macro @code{MD_EXEC_PREFIX}, if defined, but only if this is a native
compiler.
@item
-The macro @code{MD_STARTFILE_PREFIX}, if defined, but only if this is a
+The macro @code{MD_STARTFILE_PREFIX}, if defined, but only if this is a
native compiler, or we have a target system root.
@item
-The macro @code{MD_STARTFILE_PREFIX_1}, if defined, but only if this is a
+The macro @code{MD_STARTFILE_PREFIX_1}, if defined, but only if this is a
native compiler, or we have a target system root.
@item
then the hook should return the same mode as @code{promote_mode}, though
the signedness may be different.
+@var{type} can be NULL when promoting function arguments of libcalls.
+
The default is to not promote arguments and return values. You can
also define the hook to @code{default_promote_function_mode_always_promote}
if you would like to apply the same rules given by @code{PROMOTE_MODE}.
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
+@code{TARGET_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
register, so @code{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{PREFERRED_RELOAD_CLASS}.
+@code{TARGET_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{PREFERRED_RELOAD_CLASS}
must have move patterns for this mode.
@end deftypefn
+@deftypefn {Target Hook} bool TARGET_ARRAY_MODE_SUPPORTED_P (enum machine_mode @var{mode}, unsigned HOST_WIDE_INT @var{nelems})
+Return true if GCC should try to use a scalar mode to store an array
+of @var{nelems} elements, given that each element has mode @var{mode}.
+Returning true here overrides the usual @code{MAX_FIXED_MODE} limit
+and allows GCC to use any defined integer mode.
+
+One use of this hook is to support vector load and store operations
+that operate on several homogeneous vectors. For example, ARM NEON
+has operations like:
+
+@smallexample
+int8x8x3_t vld3_s8 (const int8_t *)
+@end smallexample
+
+where the return type is defined as:
+
+@smallexample
+typedef struct int8x8x3_t
+@{
+ int8x8_t val[3];
+@} int8x8x3_t;
+@end smallexample
+
+If this hook allows @code{val} to have a scalar mode, then
+@code{int8x8x3_t} can have the same mode. GCC can then store
+@code{int8x8x3_t}s in registers rather than forcing them onto the stack.
+@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
@deftypefn {Target Hook} rtx TARGET_LIBCALL_VALUE (enum machine_mode @var{mode}, const_rtx @var{fun})
Define this hook if the back-end needs to know the name of the libcall
-function in order to determine where the result should be returned.
+function in order to determine where the result should be returned.
The mode of the result is given by @var{mode} and the name of the called
-library function is given by @var{fun}. The hook should return an RTX
+library function is given by @var{fun}. The hook should return an RTX
representing the place where the library function result will be returned.
If this hook is not defined, then LIBCALL_VALUE will be used.
If the target defines @code{TARGET_ASM_TRAMPOLINE_TEMPLATE}, then the
first thing this hook should do is emit a block move into @var{m_tramp}
from the memory block returned by @code{assemble_trampoline_template}.
-Note that the block move need only cover the constant parts of the
+Note that the block move need only cover the constant parts of the
trampoline. If the target isolates the variable parts of the trampoline
to the end, not all @code{TRAMPOLINE_SIZE} bytes need be copied.
If the target requires any other actions, such as flushing caches or
-enabling stack execution, these actions should be performed after
+enabling stack execution, these actions should be performed after
initializing the trampoline proper.
@end deftypefn
is a valid address. On most machines the default definition of
@code{(CONSTANT_P (@var{x}) && GET_CODE (@var{x}) != CONST_DOUBLE)}
is acceptable, but a few machines are more restrictive as to which
-constant addresses are supported.
+constant addresses are supported.
@end defmac
@defmac CONSTANT_P (@var{x})
@code{TARGET_MODE_DEPENDENT_ADDRESS_P} target hook.
@end defmac
-@defmac LEGITIMATE_CONSTANT_P (@var{x})
-A C expression that is nonzero if @var{x} is a legitimate constant for
-an immediate operand on the target machine. You can assume that
-@var{x} satisfies @code{CONSTANT_P}, so you need not check this. In fact,
-@samp{1} is a suitable definition for this macro on machines where
-anything @code{CONSTANT_P} is valid.
-@end defmac
+@deftypefn {Target Hook} bool TARGET_LEGITIMATE_CONSTANT_P (enum machine_mode @var{mode}, rtx @var{x})
+This hook returns true if @var{x} is a legitimate constant for a
+@var{mode}-mode immediate operand on the target machine. You can assume that
+@var{x} satisfies @code{CONSTANT_P}, so you need not check this.
+
+The default definition returns true.
+@end deftypefn
@deftypefn {Target Hook} rtx TARGET_DELEGITIMIZE_ADDRESS (rtx @var{x})
This hook is used to undo the possibly obfuscating effects of the
into their original form.
@end deftypefn
-@deftypefn {Target Hook} bool TARGET_CANNOT_FORCE_CONST_MEM (rtx @var{x})
+@deftypefn {Target Hook} bool TARGET_CANNOT_FORCE_CONST_MEM (enum machine_mode @var{mode}, rtx @var{x})
This hook should return true if @var{x} is of a form that cannot (or
-should not) be spilled to the constant pool. The default version of
-this hook returns false.
+should not) be spilled to the constant pool. @var{mode} is the mode
+of @var{x}.
+
+The default version of this hook returns false.
The primary reason to define this hook is to prevent reload from
deciding that a non-legitimate constant would be better reloaded
@deftypefn {Target Hook} int TARGET_VECTORIZE_BUILTIN_VECTORIZATION_COST (enum vect_cost_for_stmt @var{type_of_cost}, tree @var{vectype}, int @var{misalign})
Returns cost of different scalar or vector statements for vectorization cost model.
-For vector memory operations the cost may depend on type (@var{vectype}) and
+For vector memory operations the cost may depend on type (@var{vectype}) and
misalignment value (@var{misalign}).
@end deftypefn
@defmac SET_RATIO (@var{speed})
The threshold of number of scalar move insns, @emph{below} which a sequence
of insns should be generated to set memory to a constant value, instead of
-a block set insn or a library call.
+a block set insn or a library call.
Increasing the value will always make code faster, but
eventually incurs high cost in increased code size.
@defmac SET_BY_PIECES_P (@var{size}, @var{alignment})
A C expression used to determine whether @code{store_by_pieces} will be
-used to set a chunk of memory to a constant value, or whether some
-other mechanism will be used. Used by @code{__builtin_memset} when
+used to set a chunk of memory to a constant value, or whether some
+other mechanism will be used. Used by @code{__builtin_memset} when
storing values other than constant zero.
Defaults to 1 if @code{move_by_pieces_ninsns} returns less
than @code{SET_RATIO}.
when the source operand contains a symbolic address. You may also
need to alter the handling of switch statements so that they use
relative addresses.
-@c i rearranged the order of the macros above to try to force one of
+@c i rearranged the order of the macros above to try to force one of
@c them to the next line, to eliminate an overfull hbox. --mew 10feb93
@defmac PIC_OFFSET_TABLE_REGNUM
@deftypefn {Target Hook} {section *} TARGET_ASM_FUNCTION_SECTION (tree @var{decl}, enum node_frequency @var{freq}, bool @var{startup}, bool @var{exit})
Return preferred text (sub)section for function @var{decl}.
Main purpose of this function is to separate cold, normal and hot
-functions. @var{startup} is true when function is known to be used only
+functions. @var{startup} is true when function is known to be used only
at startup (from static constructors or it is @code{main()}).
@var{exit} is true when function is known to be used only at exit
(from static destructors).
@defmac CLZ_DEFINED_VALUE_AT_ZERO (@var{mode}, @var{value})
@defmacx CTZ_DEFINED_VALUE_AT_ZERO (@var{mode}, @var{value})
A C expression that indicates whether the architecture defines a value
-for @code{clz} or @code{ctz} with a zero operand.
+for @code{clz} or @code{ctz} with a zero operand.
A result of @code{0} indicates the value is undefined.
If the value is defined for only the RTL expression, the macro should
evaluate to @code{1}; if the value applies also to the corresponding optab
entry (which is normally the case if it expands directly into
-the corresponding RTL), then the macro should evaluate to @code{2}.
+the corresponding RTL), then the macro should evaluate to @code{2}.
In the cases where the value is defined, @var{value} should be set to
-this value.
+this value.
If this macro is not defined, the value of @code{clz} or
@code{ctz} at zero is assumed to be undefined.
@defmac FUNCTION_MODE
An alias for the machine mode used for memory references to functions
being called, in @code{call} RTL expressions. On most CISC machines,
-where an instruction can begin at any byte address, this should be
+where an instruction can begin at any byte address, this should be
@code{QImode}. On most RISC machines, where all instructions have fixed
size and alignment, this should be a mode with the same size and alignment
as the machine instruction words - typically @code{SImode} or @code{HImode}.
@end deftypefn
@deftypefn {Target Hook} void TARGET_SET_CURRENT_FUNCTION (tree @var{decl})
-The compiler invokes this hook whenever it changes its current function
+The compiler invokes this hook whenever it changes its current function
context (@code{cfun}). You can define this function if
the back end needs to perform any initialization or reset actions on a
per-function basis. For example, it may be used to implement function
@deftypefn {Target Hook} {const char *} TARGET_INVALID_PARAMETER_TYPE (const_tree @var{type})
If defined, this macro returns the diagnostic message when it is
-invalid for functions to include parameters of type @var{type},
+invalid for functions to include parameters of type @var{type},
or @code{NULL} if validity should be determined by
the front end. This is currently used only by the C and C++ front ends.
@end deftypefn
@deftypefn {Target Hook} {const char *} TARGET_INVALID_RETURN_TYPE (const_tree @var{type})
If defined, this macro returns the diagnostic message when it is
-invalid for functions to have return type @var{type},
+invalid for functions to have return type @var{type},
or @code{NULL} if validity should be determined by
the front end. This is currently used only by the C and C++ front ends.
@end deftypefn
@deftypefn {Target Hook} tree TARGET_PROMOTED_TYPE (const_tree @var{type})
-If defined, this target hook returns the type to which values of
-@var{type} should be promoted when they appear in expressions,
+If defined, this target hook returns the type to which values of
+@var{type} should be promoted when they appear in expressions,
analogous to the integer promotions, or @code{NULL_TREE} to use the
front end's normal promotion rules. This hook is useful when there are
target-specific types with special promotion rules.
@end deftypefn
@deftypefn {Target Hook} tree TARGET_CONVERT_TO_TYPE (tree @var{type}, tree @var{expr})
-If defined, this hook returns the result of converting @var{expr} to
-@var{type}. It should return the converted expression,
+If defined, this hook returns the result of converting @var{expr} to
+@var{type}. It should return the converted expression,
or @code{NULL_TREE} to apply the front end's normal conversion rules.
-This hook is useful when there are target-specific types with special
+This hook is useful when there are target-specific types with special
conversion rules.
This is currently used only by the C and C++ front ends.
@end deftypefn
@defmac LIBGCC2_UNWIND_ATTRIBUTE
Define this macro if any target-specific attributes need to be attached
-to the functions in @file{libgcc} that provide low-level support for
+to the functions in @file{libgcc} that provide low-level support for
call stack unwinding. It is used in declarations in @file{unwind-generic.h}
and the associated definitions of those functions.
@end defmac
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