/* Data structure definitions for a generic GCC target.
- Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
+ Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
#include "insn-modes.h"
struct stdarg_info;
+struct spec_info_def;
/* The struct used by the secondary_reload target hook. */
typedef struct secondary_reload_info
between the already scheduled insn (first parameter) and the
the second insn (second parameter). */
bool (* is_costly_dependence) (rtx, rtx, rtx, int, int);
+
+ /* Given the current cost, COST, of an insn, INSN, calculate and
+ return a new cost based on its relationship to DEP_INSN through the
+ dependence of type DEP_TYPE. The default is to make no adjustment. */
+ int (* adjust_cost_2) (rtx insn, int, rtx def_insn, int cost);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler. This hook is called to notify the backend
+ that new instructions were emitted. */
+ void (* h_i_d_extended) (void);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler.
+ The first parameter is an instruction, the second parameter is the type
+ of the requested speculation, and the third parameter is a pointer to the
+ speculative pattern of the corresponding type (set if return value == 1).
+ It should return
+ -1, if there is no pattern, that will satisfy the requested speculation
+ type,
+ 0, if current pattern satisfies the requested speculation type,
+ 1, if pattern of the instruction should be changed to the newly
+ generated one. */
+ int (* speculate_insn) (rtx, int, rtx *);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler. It should return true if the check instruction
+ corresponding to the instruction passed as the parameter needs a
+ recovery block. */
+ bool (* needs_block_p) (rtx);
+
+ /* The following member value is a pointer to a function called
+ by the insn scheduler. It should return a pattern for the check
+ instruction.
+ The first parameter is a speculative instruction, the second parameter
+ is the label of the corresponding recovery block (or null, if it is a
+ simple check). If the mutation of the check is requested (e.g. from
+ ld.c to chk.a), the third parameter is true - in this case the first
+ parameter is the previous check. */
+ rtx (* gen_check) (rtx, rtx, bool);
+
+ /* The following member value is a pointer to a function controlling
+ what insns from the ready insn queue will be considered for the
+ multipass insn scheduling. If the hook returns zero for the insn
+ passed as the parameter, the insn will not be chosen to be
+ issued. This hook is used to discard speculative instructions,
+ that stand at the first position of the ready list. */
+ bool (* first_cycle_multipass_dfa_lookahead_guard_spec) (rtx);
+
+ /* The following member value is a pointer to a function that provides
+ information about the speculation capabilities of the target.
+ The parameter is a pointer to spec_info variable. */
+ void (* set_sched_flags) (struct spec_info_def *);
} sched;
/* Functions relating to vectorization. */
/* Return true if anonymous bitfields affect structure alignment. */
bool (* align_anon_bitfield) (void);
+ /* Return true if volatile bitfields should use the narrowest type possible.
+ Return false if they should use the container type. */
+ bool (* narrow_volatile_bitfield) (void);
+
/* Set up target-specific built-in functions. */
void (* init_builtins) (void);
rtx (* expand_builtin) (tree exp, rtx target, rtx subtarget,
enum machine_mode mode, int ignore);
- /* Expand a target-specific library builtin. */
- rtx (* expand_library_builtin) (tree exp, rtx target, rtx subtarget,
- enum machine_mode mode, int ignore);
-
/* Select a replacement for a target-specific builtin. This is done
*before* regular type checking, and so allows the target to implement
a crude form of function overloading. The result is a complete
the reciprocal. */
unsigned int (* min_divisions_for_recip_mul) (enum machine_mode mode);
+ /* If the representation of integral MODE is such that values are
+ always sign-extended to a wider mode MODE_REP then return
+ SIGN_EXTEND. Return UNKNOWN otherwise. */
+ /* Note that the return type ought to be RTX_CODE, but that's not
+ necessarily defined at this point. */
+ int (* mode_rep_extended) (enum machine_mode mode,
+ enum machine_mode mode_rep);
+
/* True if MODE is valid for a pointer in __attribute__((mode("MODE"))). */
bool (* valid_pointer_mode) (enum machine_mode mode);
/* True if arbitrary sections are supported. */
bool have_named_sections;
+ /* True if we can create zeroed data by switching to a BSS section
+ and then using ASM_OUTPUT_SKIP to allocate the space. */
+ bool have_switchable_bss_sections;
+
/* True if "native" constructors and destructors are supported,
false if we're using collect2 for the job. */
bool have_ctors_dtors;
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