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For PR java/6005 and PR java/7611:

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* fold-const.c (fold_truthop): Use can_use_bit_fields_p.
	(fold): Likewise.
	* langhooks.c (lhd_can_use_bit_fields_p): New function.
	* langhooks-def.h (lhd_can_use_bit_fields_p): Declare.
	(LANG_HOOKS_CAN_USE_BIT_FIELDS_P): New define.
	(LANG_HOOKS_INITIALIZER): Use it.
	* langhooks.h (struct lang_hooks) [can_use_bit_fields_p]: New
	field.

From-SVN: r56498
This commit is contained in:
Tom Tromey 2002-08-22 00:42:40 +00:00 committed by Tom Tromey
parent 0d811e1a74
commit 57ce46bb22
5 changed files with 34 additions and 2 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
2002-08-21 Tom Tromey <tromey@redhat.com>
For PR java/6005 and PR java/7611:
* fold-const.c (fold_truthop): Use can_use_bit_fields_p.
(fold): Likewise.
* langhooks.c (lhd_can_use_bit_fields_p): New function.
* langhooks-def.h (lhd_can_use_bit_fields_p): Declare.
(LANG_HOOKS_CAN_USE_BIT_FIELDS_P): New define.
(LANG_HOOKS_INITIALIZER): Use it.
* langhooks.h (struct lang_hooks) [can_use_bit_fields_p]: New
field.
2002-08-21 Stan Shebs <shebs@apple.com>
* tree.c (finish_vector_type): Fix a typo in a comment.

10
gcc/fold-const.c
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@ -1,5 +1,5 @@
/* Fold a constant sub-tree into a single node for C-compiler
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2002,
1999, 2000, 2001, 2002 Free Software Foundation, Inc.
This file is part of GCC.
@ -3711,6 +3711,11 @@ fold_truthop (code, truth_type, lhs, rhs)
return 0;
}
/* After this point all optimizations will generate bit-field
references, which we might not want. */
if (! (*lang_hooks.can_use_bit_fields_p) ())
return 0;
/* See if we can find a mode that contains both fields being compared on
the left. If we can't, fail. Otherwise, update all constants and masks
to be relative to a field of that size. */
@ -6590,7 +6595,8 @@ fold (expr)
}
/* If this is a comparison of a field, we may be able to simplify it. */
if ((TREE_CODE (arg0) == COMPONENT_REF
if (((TREE_CODE (arg0) == COMPONENT_REF
&& (*lang_hooks.can_use_bit_fields_p) ())
|| TREE_CODE (arg0) == BIT_FIELD_REF)
&& (code == EQ_EXPR || code == NE_EXPR)
/* Handle the constant case even without -O

3
gcc/langhooks-def.h
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@ -59,6 +59,7 @@ extern rtx lhd_expand_expr PARAMS ((tree, rtx, enum machine_mode, int));
extern void lhd_print_error_function PARAMS ((struct diagnostic_context *,
const char *));
extern void lhd_set_decl_assembler_name PARAMS ((tree));
extern bool lhd_can_use_bit_fields_p PARAMS ((void));
extern bool lhd_warn_unused_global_decl PARAMS ((tree));
extern void lhd_incomplete_type_error PARAMS ((tree, tree));
extern tree lhd_type_promotes_to PARAMS ((tree));
@ -102,6 +103,7 @@ tree lhd_tree_inlining_convert_parm_for_inlining PARAMS ((tree, tree, tree));
#define LANG_HOOKS_UNSAVE_EXPR_NOW lhd_unsave_expr_now
#define LANG_HOOKS_MAYBE_BUILD_CLEANUP lhd_return_null_tree
#define LANG_HOOKS_SET_DECL_ASSEMBLER_NAME lhd_set_decl_assembler_name
#define LANG_HOOKS_CAN_USE_BIT_FIELDS_P lhd_can_use_bit_fields_p
#define LANG_HOOKS_HONOR_READONLY false
#define LANG_HOOKS_PRINT_STATISTICS lhd_do_nothing
#define LANG_HOOKS_PRINT_XNODE lhd_print_tree_nothing
@ -241,6 +243,7 @@ int lhd_tree_dump_type_quals PARAMS ((tree));
LANG_HOOKS_UNSAVE_EXPR_NOW, \
LANG_HOOKS_MAYBE_BUILD_CLEANUP, \
LANG_HOOKS_SET_DECL_ASSEMBLER_NAME, \
LANG_HOOKS_CAN_USE_BIT_FIELDS_P, \
LANG_HOOKS_HONOR_READONLY, \
LANG_HOOKS_PRINT_STATISTICS, \
LANG_HOOKS_PRINT_XNODE, \

7
gcc/langhooks.c
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@ -175,6 +175,13 @@ lhd_set_decl_assembler_name (decl)
abort ();
}
/* By default we always allow bit-field based optimizations. */
bool
lhd_can_use_bit_fields_p ()
{
return true;
}
/* Provide a default routine to clear the binding stack. This is used
by languages that don't need to do anything special. */
void

4
gcc/langhooks.h
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@ -299,6 +299,10 @@ struct lang_hooks
assembler does not talk about it. */
void (*set_decl_assembler_name) PARAMS ((tree));
/* Return nonzero if fold-const is free to use bit-field
optimizations, for instance in fold_truthop(). */
bool (*can_use_bit_fields_p) PARAMS ((void));
/* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */
bool honor_readonly;