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gcc/gcc/expr.h
Richard Biener 585334d41d re PR middle-end/71310 (Bitfields cause load hit store with smaller store and larger load) 
2016-06-14  Richard Biener  <rguenther@suse.de>

	PR middle-end/71310
	PR bootstrap/71510
	* expr.h (get_bit_range): Declare.
	* expr.c (get_bit_range): Export.
	* fold-const.c (optimize_bit_field_compare): Use get_bit_range and
	word_mode again to constrain the bitfield access.

From-SVN: r237426
2016-06-14 07:26:52 +00:00

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/* Definitions for code generation pass of GNU compiler.
Copyright (C) 1987-2016 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_EXPR_H
#define GCC_EXPR_H
/* This is the 4th arg to `expand_expr'.
EXPAND_STACK_PARM means we are possibly expanding a call param onto
the stack.
EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
is a constant that is not a legitimate address.
EXPAND_WRITE means we are only going to write to the resulting rtx.
EXPAND_MEMORY means we are interested in a memory result, even if
the memory is constant and we could have propagated a constant value,
or the memory is unaligned on a STRICT_ALIGNMENT target. */
enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
EXPAND_MEMORY};
/* Prevent the compiler from deferring stack pops. See
inhibit_defer_pop for more information. */
#define NO_DEFER_POP (inhibit_defer_pop += 1)
/* Allow the compiler to defer stack pops. See inhibit_defer_pop for
more information. */
#define OK_DEFER_POP (inhibit_defer_pop -= 1)
/* This structure is used to pass around information about exploded
unary, binary and trinary expressions between expand_expr_real_1 and
friends. */
typedef struct separate_ops
{
enum tree_code code;
location_t location;
tree type;
tree op0, op1, op2;
} *sepops;
/* This is run during target initialization to set up which modes can be
used directly in memory and to initialize the block move optab. */
extern void init_expr_target (void);
/* This is run at the start of compiling a function. */
extern void init_expr (void);
/* Emit some rtl insns to move data between rtx's, converting machine modes.
Both modes must be floating or both fixed. */
extern void convert_move (rtx, rtx, int);
/* Convert an rtx to specified machine mode and return the result. */
extern rtx convert_to_mode (machine_mode, rtx, int);
/* Convert an rtx to MODE from OLDMODE and return the result. */
extern rtx convert_modes (machine_mode, machine_mode, rtx, int);
/* Expand a call to memcpy or memmove or memcmp, and return the result. */
extern rtx emit_block_op_via_libcall (enum built_in_function, rtx, rtx, rtx,
bool);
static inline rtx
emit_block_copy_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
{
return emit_block_op_via_libcall (BUILT_IN_MEMCPY, dst, src, size, tailcall);
}
static inline rtx
emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
{
return emit_block_op_via_libcall (BUILT_IN_MEMMOVE, dst, src, size, tailcall);
}
static inline rtx
emit_block_comp_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false)
{
return emit_block_op_via_libcall (BUILT_IN_MEMCMP, dst, src, size, tailcall);
}
/* Emit code to move a block Y to a block X. */
enum block_op_methods
{
BLOCK_OP_NORMAL,
BLOCK_OP_NO_LIBCALL,
BLOCK_OP_CALL_PARM,
/* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
BLOCK_OP_TAILCALL
};
typedef rtx (*by_pieces_constfn) (void *, HOST_WIDE_INT, machine_mode);
extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
unsigned int, HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT);
extern rtx emit_block_cmp_hints (rtx, rtx, rtx, tree, rtx, bool,
by_pieces_constfn, void *);
extern bool emit_storent_insn (rtx to, rtx from);
/* Copy all or part of a value X into registers starting at REGNO.
The number of registers to be filled is NREGS. */
extern void move_block_to_reg (int, rtx, int, machine_mode);
/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
The number of registers to be filled is NREGS. */
extern void move_block_from_reg (int, rtx, int);
/* Generate a non-consecutive group of registers represented by a PARALLEL. */
extern rtx gen_group_rtx (rtx);
/* Load a BLKmode value into non-consecutive registers represented by a
PARALLEL. */
extern void emit_group_load (rtx, rtx, tree, int);
/* Similarly, but load into new temporaries. */
extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
/* Move a non-consecutive group of registers represented by a PARALLEL into
a non-consecutive group of registers represented by a PARALLEL. */
extern void emit_group_move (rtx, rtx);
/* Move a group of registers represented by a PARALLEL into pseudos. */
extern rtx emit_group_move_into_temps (rtx);
/* Store a BLKmode value from non-consecutive registers represented by a
PARALLEL. */
extern void emit_group_store (rtx, rtx, tree, int);
extern rtx maybe_emit_group_store (rtx, tree);
/* Copy BLKmode object from a set of registers. */
extern void copy_blkmode_from_reg (rtx, rtx, tree);
/* Mark REG as holding a parameter for the next CALL_INSN.
Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
extern void use_reg_mode (rtx *, rtx, machine_mode);
extern void clobber_reg_mode (rtx *, rtx, machine_mode);
extern rtx copy_blkmode_to_reg (machine_mode, tree);
/* Mark REG as holding a parameter for the next CALL_INSN. */
static inline void
use_reg (rtx *fusage, rtx reg)
{
use_reg_mode (fusage, reg, VOIDmode);
}
/* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */
static inline void
clobber_reg (rtx *fusage, rtx reg)
{
clobber_reg_mode (fusage, reg, VOIDmode);
}
/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
for the next CALL_INSN. */
extern void use_regs (rtx *, int, int);
/* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
extern void use_group_regs (rtx *, rtx);
#ifdef GCC_INSN_CODES_H
extern rtx expand_cmpstrn_or_cmpmem (insn_code, rtx, rtx, rtx, tree, rtx,
HOST_WIDE_INT);
#endif
/* Write zeros through the storage of OBJECT.
If OBJECT has BLKmode, SIZE is its length in bytes. */
extern rtx clear_storage (rtx, rtx, enum block_op_methods);
extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
unsigned int, HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT);
/* The same, but always output an library call. */
extern rtx set_storage_via_libcall (rtx, rtx, rtx, bool = false);
/* Expand a setmem pattern; return true if successful. */
extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
unsigned int, HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT,
unsigned HOST_WIDE_INT);
/* Return nonzero if it is desirable to store LEN bytes generated by
CONSTFUN with several move instructions by store_by_pieces
function. CONSTFUNDATA is a pointer which will be passed as argument
in every CONSTFUN call.
ALIGN is maximum alignment we can assume.
MEMSETP is true if this is a real memset/bzero, not a copy
of a const string. */
extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
by_pieces_constfn,
void *, unsigned int, bool);
/* Generate several move instructions to store LEN bytes generated by
CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
pointer which will be passed as argument in every CONSTFUN call.
ALIGN is maximum alignment we can assume.
MEMSETP is true if this is a real memset/bzero, not a copy.
Returns TO + LEN. */
extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, by_pieces_constfn,
void *, unsigned int, bool, int);
/* Emit insns to set X from Y. */
extern rtx_insn *emit_move_insn (rtx, rtx);
extern rtx_insn *gen_move_insn (rtx, rtx);
/* Emit insns to set X from Y, with no frills. */
extern rtx_insn *emit_move_insn_1 (rtx, rtx);
extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx);
extern rtx_insn *emit_move_complex_parts (rtx, rtx);
extern rtx read_complex_part (rtx, bool);
extern void write_complex_part (rtx, rtx, bool);
extern rtx read_complex_part (rtx, bool);
extern rtx emit_move_resolve_push (machine_mode, rtx);
/* Push a block of length SIZE (perhaps variable)
and return an rtx to address the beginning of the block. */
extern rtx push_block (rtx, int, int);
/* Generate code to push something onto the stack, given its mode and type. */
extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int,
int, rtx, int, rtx, rtx, int, rtx, bool);
/* Extract the accessible bit-range from a COMPONENT_REF. */
extern void get_bit_range (unsigned HOST_WIDE_INT *, unsigned HOST_WIDE_INT *,
tree, HOST_WIDE_INT *, tree *);
/* Expand an assignment that stores the value of FROM into TO. */
extern void expand_assignment (tree, tree, bool);
/* Generate code for computing expression EXP,
and storing the value into TARGET.
If SUGGEST_REG is nonzero, copy the value through a register
and return that register, if that is possible. */
extern rtx store_expr_with_bounds (tree, rtx, int, bool, bool, tree);
extern rtx store_expr (tree, rtx, int, bool, bool);
/* Given an rtx that may include add and multiply operations,
generate them as insns and return a pseudo-reg containing the value.
Useful after calling expand_expr with 1 as sum_ok. */
extern rtx force_operand (rtx, rtx);
/* Work horses for expand_expr. */
extern rtx expand_expr_real (tree, rtx, machine_mode,
enum expand_modifier, rtx *, bool);
extern rtx expand_expr_real_1 (tree, rtx, machine_mode,
enum expand_modifier, rtx *, bool);
extern rtx expand_expr_real_2 (sepops, rtx, machine_mode,
enum expand_modifier);
/* Generate code for computing expression EXP.
An rtx for the computed value is returned. The value is never null.
In the case of a void EXP, const0_rtx is returned. */
static inline rtx
expand_expr (tree exp, rtx target, machine_mode mode,
enum expand_modifier modifier)
{
return expand_expr_real (exp, target, mode, modifier, NULL, false);
}
static inline rtx
expand_normal (tree exp)
{
return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false);
}
/* Return the tree node and offset if a given argument corresponds to
a string constant. */
extern tree string_constant (tree, tree *);
/* Two different ways of generating switch statements. */
extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, int);
extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, int);
extern int safe_from_p (const_rtx, tree, int);
/* Get the personality libfunc for a function decl. */
rtx get_personality_function (tree);
/* Determine whether the LEN bytes can be moved by using several move
instructions. Return nonzero if a call to move_by_pieces should
succeed. */
extern bool can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree);
extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *,
HOST_WIDE_INT *, bool *);
extern void expand_operands (tree, tree, rtx, rtx*, rtx*,
enum expand_modifier);
/* rtl.h and tree.h were included. */
/* Return an rtx for the size in bytes of the value of an expr. */
extern rtx expr_size (tree);
#endif /* GCC_EXPR_H */
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