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tree.def (BIT_FIELD_REF): Constrain result type and its precision.

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2008-03-06  Richard Guenther  <rguenther@suse.de>

	* tree.def (BIT_FIELD_REF): Constrain result type and its precision.
	* tree-cfg.c (verify_expr): Verify BIT_FIELD_REF constraints on
	result type and precision.
	* expr.c (get_inner_reference): Set unsignedp based on the result
	type of BIT_FIELD_REF.
	* tree.h (BIT_FIELD_REF_UNSIGNED): Remove.
	* tree-sra.c (instantiate_element): Do not set BIT_FIELD_REF_UNSIGNED.
	(try_instantiate_multiple_fields): Likewise.  Use the correct type
	for BIT_FIELD_REF.
	(sra_build_assignment): Likewise.
	(sra_build_elt_assignment): Likewise.
	(sra_explode_bitfield_assignment): Likewise.
	* print-tree.c (print_node): Do not check BIT_FIELD_REF_UNSIGNED.
	* tree-vect-transform.c (vect_create_epilog_for_reduction): Do not
	set BIT_FIELD_REF_UNSIGNED.
	(vectorizable_load): Likewise.

From-SVN: r132969
This commit is contained in:
Richard Guenther 2008-03-06 12:08:23 +00:00 committed by Richard Biener
parent e186ff694e
commit fc0f49f351
8 changed files with 53 additions and 28 deletions
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19
gcc/ChangeLog
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@ -1,3 +1,22 @@
2008-03-06 Richard Guenther <rguenther@suse.de>
* tree.def (BIT_FIELD_REF): Constrain result type and its precision.
* tree-cfg.c (verify_expr): Verify BIT_FIELD_REF constraints on
result type and precision.
* expr.c (get_inner_reference): Set unsignedp based on the result
type of BIT_FIELD_REF.
* tree.h (BIT_FIELD_REF_UNSIGNED): Remove.
* tree-sra.c (instantiate_element): Do not set BIT_FIELD_REF_UNSIGNED.
(try_instantiate_multiple_fields): Likewise. Use the correct type
for BIT_FIELD_REF.
(sra_build_assignment): Likewise.
(sra_build_elt_assignment): Likewise.
(sra_explode_bitfield_assignment): Likewise.
* print-tree.c (print_node): Do not check BIT_FIELD_REF_UNSIGNED.
* tree-vect-transform.c (vect_create_epilog_for_reduction): Do not
set BIT_FIELD_REF_UNSIGNED.
(vectorizable_load): Likewise.
2008-03-06 Andreas Krebbel <krebbel1@de.ibm.com>
* cse.c (cse_extended_basic_block): Invalidate artificial defs

3
gcc/expr.c
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@ -5893,7 +5893,8 @@ get_inner_reference (tree exp, HOST_WIDE_INT *pbitsize,
else if (TREE_CODE (exp) == BIT_FIELD_REF)
{
size_tree = TREE_OPERAND (exp, 1);
*punsignedp = BIT_FIELD_REF_UNSIGNED (exp);
*punsignedp = (! INTEGRAL_TYPE_P (TREE_TYPE (exp))
|| TYPE_UNSIGNED (TREE_TYPE (exp)));
/* For vector types, with the correct size of access, use the mode of
inner type. */

2
gcc/print-tree.c
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@ -676,8 +676,6 @@ print_node (FILE *file, const char *prefix, tree node, int indent)
case tcc_reference:
case tcc_statement:
case tcc_vl_exp:
if (TREE_CODE (node) == BIT_FIELD_REF && BIT_FIELD_REF_UNSIGNED (node))
fputs (" unsigned", file);
if (TREE_CODE (node) == BIND_EXPR)
{
print_node (file, "vars", TREE_OPERAND (node, 0), indent + 4);

16
gcc/tree-cfg.c
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@ -3277,6 +3277,22 @@ verify_expr (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
error ("invalid position or size operand to BIT_FIELD_REF");
return t;
}
else if (INTEGRAL_TYPE_P (TREE_TYPE (t))
&& (TYPE_PRECISION (TREE_TYPE (t))
!= TREE_INT_CST_LOW (TREE_OPERAND (t, 1))))
{
error ("integral result type precision does not match "
"field size of BIT_FIELD_REF");
return t;
}
if (!INTEGRAL_TYPE_P (TREE_TYPE (t))
&& (GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (t)))
!= TREE_INT_CST_LOW (TREE_OPERAND (t, 1))))
{
error ("mode precision of non-integral result does not "
"match field size of BIT_FIELD_REF");
return t;
}
}
t = TREE_OPERAND (t, 0);

25
gcc/tree-sra.c
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@ -1280,9 +1280,6 @@ instantiate_element (struct sra_elt *elt)
TYPE_SIZE (elt->type),
DECL_SIZE (var))
: bitsize_int (0));
if (!INTEGRAL_TYPE_P (elt->type)
|| TYPE_UNSIGNED (elt->type))
BIT_FIELD_REF_UNSIGNED (elt->replacement) = 1;
}
/* For vectors, if used on the left hand side with BIT_FIELD_REF,
@ -1677,12 +1674,17 @@ try_instantiate_multiple_fields (struct sra_elt *elt, tree f)
/* Create the field group as a single variable. */
type = lang_hooks.types.type_for_mode (mode, 1);
/* We used to create a type for the mode above, but size turns
to be out not of mode-size. As we need a matching type
to build a BIT_FIELD_REF, use a nonstandard integer type as
fallback. */
type = lang_hooks.types.type_for_size (size, 1);
if (!type || TYPE_PRECISION (type) != size)
type = build_nonstandard_integer_type (size, 1);
gcc_assert (type);
var = build3 (BIT_FIELD_REF, type, NULL_TREE,
bitsize_int (size),
bitsize_int (bit));
BIT_FIELD_REF_UNSIGNED (var) = 1;
block = instantiate_missing_elements_1 (elt, var, type);
gcc_assert (block && block->is_scalar);
@ -1696,7 +1698,6 @@ try_instantiate_multiple_fields (struct sra_elt *elt, tree f)
TREE_TYPE (block->element), var,
bitsize_int (size),
bitsize_int (bit & ~alchk));
BIT_FIELD_REF_UNSIGNED (block->replacement) = 1;
}
block->in_bitfld_block = 2;
@ -1719,7 +1720,6 @@ try_instantiate_multiple_fields (struct sra_elt *elt, tree f)
+ (TREE_INT_CST_LOW
(DECL_FIELD_BIT_OFFSET (f))))
& ~alchk));
BIT_FIELD_REF_UNSIGNED (fld->replacement) = TYPE_UNSIGNED (field_type);
fld->in_bitfld_block = 1;
}
@ -2141,7 +2141,8 @@ sra_build_assignment (tree dst, tree src)
tree var, shift, width;
tree utype, stype, stmp, utmp, dtmp;
tree list, stmt;
bool unsignedp = BIT_FIELD_REF_UNSIGNED (src);
bool unsignedp = (INTEGRAL_TYPE_P (TREE_TYPE (src))
? TYPE_UNSIGNED (TREE_TYPE (src)) : true);
var = TREE_OPERAND (src, 0);
width = TREE_OPERAND (src, 1);
@ -2491,6 +2492,7 @@ sra_build_elt_assignment (struct sra_elt *elt, tree src)
if (elt->in_bitfld_block == 2
&& TREE_CODE (src) == BIT_FIELD_REF)
{
tmp = src;
cst = TYPE_SIZE (TREE_TYPE (var));
cst2 = size_binop (MINUS_EXPR, TREE_OPERAND (src, 2),
TREE_OPERAND (dst, 2));
@ -2536,8 +2538,7 @@ sra_build_elt_assignment (struct sra_elt *elt, tree src)
}
else
{
src = fold_build3 (BIT_FIELD_REF, TREE_TYPE (var), src, cst, cst2);
BIT_FIELD_REF_UNSIGNED (src) = 1;
src = fold_convert (TREE_TYPE (var), tmp);
}
return sra_build_assignment (var, src);
@ -3014,6 +3015,8 @@ sra_explode_bitfield_assignment (tree var, tree vpos, bool to_var,
type = TREE_TYPE (infld);
if (TYPE_PRECISION (type) != TREE_INT_CST_LOW (flen))
type = lang_hooks.types.type_for_size (TREE_INT_CST_LOW (flen), 1);
else
type = unsigned_type_for (type);
if (TREE_CODE (infld) == BIT_FIELD_REF)
{
@ -3031,7 +3034,6 @@ sra_explode_bitfield_assignment (tree var, tree vpos, bool to_var,
}
infld = fold_build3 (BIT_FIELD_REF, type, infld, flen, fpos);
BIT_FIELD_REF_UNSIGNED (infld) = 1;
invar = size_binop (MINUS_EXPR, flp.field_pos, bpos);
if (flp.overlap_pos)
@ -3039,7 +3041,6 @@ sra_explode_bitfield_assignment (tree var, tree vpos, bool to_var,
invar = size_binop (PLUS_EXPR, invar, vpos);
invar = fold_build3 (BIT_FIELD_REF, type, var, flen, invar);
BIT_FIELD_REF_UNSIGNED (invar) = 1;
if (to_var)
st = sra_build_bf_assignment (invar, infld);

5
gcc/tree-vect-transform.c
View File

@ -2517,7 +2517,6 @@ vect_create_epilog_for_reduction (tree vect_def, tree stmt,
vec_size_in_bits = tree_low_cst (TYPE_SIZE (vectype), 1);
rhs = build3 (BIT_FIELD_REF, scalar_type, vec_temp, bitsize,
bitsize_zero_node);
BIT_FIELD_REF_UNSIGNED (rhs) = TYPE_UNSIGNED (scalar_type);
epilog_stmt = build_gimple_modify_stmt (new_scalar_dest, rhs);
new_temp = make_ssa_name (new_scalar_dest, epilog_stmt);
GIMPLE_STMT_OPERAND (epilog_stmt, 0) = new_temp;
@ -2532,7 +2531,6 @@ vect_create_epilog_for_reduction (tree vect_def, tree stmt,
tree rhs = build3 (BIT_FIELD_REF, scalar_type, vec_temp, bitsize,
bitpos);
BIT_FIELD_REF_UNSIGNED (rhs) = TYPE_UNSIGNED (scalar_type);
epilog_stmt = build_gimple_modify_stmt (new_scalar_dest, rhs);
new_name = make_ssa_name (new_scalar_dest, epilog_stmt);
GIMPLE_STMT_OPERAND (epilog_stmt, 0) = new_name;
@ -2568,7 +2566,6 @@ vect_create_epilog_for_reduction (tree vect_def, tree stmt,
bitpos = bitsize_zero_node;
rhs = build3 (BIT_FIELD_REF, scalar_type, new_temp, bitsize, bitpos);
BIT_FIELD_REF_UNSIGNED (rhs) = TYPE_UNSIGNED (scalar_type);
epilog_stmt = build_gimple_modify_stmt (new_scalar_dest, rhs);
new_temp = make_ssa_name (new_scalar_dest, epilog_stmt);
GIMPLE_STMT_OPERAND (epilog_stmt, 0) = new_temp;
@ -5877,8 +5874,6 @@ vectorizable_load (tree stmt, block_stmt_iterator *bsi, tree *vec_stmt,
bitpos = bitsize_zero_node;
vec_inv = build3 (BIT_FIELD_REF, scalar_type, new_temp,
bitsize, bitpos);
BIT_FIELD_REF_UNSIGNED (vec_inv) =
TYPE_UNSIGNED (scalar_type);
vec_dest =
vect_create_destination_var (scalar_dest, NULL_TREE);
new_stmt = build_gimple_modify_stmt (vec_dest, vec_inv);

5
gcc/tree.def
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@ -391,8 +391,9 @@ DEFTREECODE (COMPONENT_REF, "component_ref", tcc_reference, 3)
Operand 0 is the structure or union expression;
operand 1 is a tree giving the constant number of bits being referenced;
operand 2 is a tree giving the constant position of the first referenced bit.
The field can be either a signed or unsigned field;
BIT_FIELD_REF_UNSIGNED says which. */
The result type width has to match the number of bits referenced.
If the result type is integral, its signedness specifies how it is extended
to its mode width. */
DEFTREECODE (BIT_FIELD_REF, "bit_field_ref", tcc_reference, 3)
/* The ordering of the following codes is optimized for the checking

6
gcc/tree.h
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@ -542,8 +542,6 @@ struct gimple_stmt GTY(())
all types
DECL_UNSIGNED in
all decls
BIT_FIELD_REF_UNSIGNED in
BIT_FIELD_REF
asm_written_flag:
@ -1301,10 +1299,6 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int,
#define DECL_UNSIGNED(NODE) \
(DECL_COMMON_CHECK (NODE)->base.unsigned_flag)
/* In a BIT_FIELD_REF, means the bitfield is to be interpreted as unsigned. */
#define BIT_FIELD_REF_UNSIGNED(NODE) \
(BIT_FIELD_REF_CHECK (NODE)->base.unsigned_flag)
/* In integral and pointer types, means an unsigned type. */
#define TYPE_UNSIGNED(NODE) (TYPE_CHECK (NODE)->base.unsigned_flag)