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md.texi: Document define_subst. 

* doc/md.texi: Document define_subst.
        * gensupport.c (MAX_OPERANDS): New define.
        (operand_data): New.
        (match_operand_entries_in_pattern): New.
        (used_operands_numbers): New.
        (subst_true): New.
        (subst_false): New.
        (define_subst_queue): New.
        (define_subst_tail): New.
        (define_subst_attr_queue): New.
        (define_subst_attr_tail): New.
        (has_subst_attribute): New.
        (subst_pattern_match): New.
        (get_alternatives_number): New.
        (alter_output_for_subst_insn): New.
        (alter_attrs_for_subst_insn): New.
        (process_substs_on_one_elem): New.
        (subst_dup): New.
        (process_define_subst): New.
        (duplicate_alternatives): New.
        (duplicate_each_alternative): New.
        (constraints_handler_t): New typedef.
        (alter_constraints): New.
        (adjust_operands_numbers): New.
        (replace_duplicating_operands_in_pattern): New.
        (remove_from_queue): New.
        (process_rtx): Handle define_subst and define_subst_attr.
        (change_subst_attribute): New.
        (alter_predicate_for_insn): Fix formatting.
        (alter_attrs_for_insn): Likewise.
        (alter_output_for_insn): Likewise.
        (mark_operands_from_match_dup): New.
        (mark_operands_used_in_match_dup): New.
        (find_first_unused_number_of_operand): New.
        (renumerate_operands_in_pattern): New.
        (generate_match_dup): New.
        (check_define_attr_duplicates): New.
        (init_rtx_reader_args_cb): Add checking for duplicated attrs and
        processing of define_subst.
        (read_md_rtx): Handle define_subst.
        * read-rtl.c (struct subst_attr_to_iter_mapping): New.
        (substs): New global.
        (apply_subst_iterator): New.
        (bind_subst_iter_and_attr): New.
        (find_subst_iter_by_attr): New.
        (map_attr_string): Handle subst-iterators.
        (add_condition_to_rtx): Handle define_subst.
        (apply_iterators): Likewise.
        (initialize_iterators): Likewise.
        (add_define_attr_for_define_subst): New.
        (add_define_subst_attr): New.
        (read_subst_mapping): New.
        (read_rtx): Handle define_subst_attr.
        (read_rtx_code): Add subst-attributes recognition during reading of
        strings.
        * rtl.def (DEFINE_EXPAND): Add vector of attributes.
        (DEFINE_SUBST): New.
        (DEFINE_SUBST_ATTR): New.


Co-Authored-By: Kirill Yukhin <kirill.yukhin@intel.com>
Co-Authored-By: Michael Zolotukhin <michael.v.zolotukhin@intel.com>

From-SVN: r193618
This commit is contained in:
Maxim Kuznetsov 2012-11-19 10:19:20 +00:00 committed by Kirill Yukhin
parent d826d5c209
commit 477c104eaf
5 changed files with 1710 additions and 15 deletions
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63
gcc/ChangeLog
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@ -1,3 +1,66 @@
2012-11-19 Maxim Kuznetsov <maxim.kuznetsov@intel.com>
Kirill Yukhin <kirill.yukhin@intel.com>
Michael Zolotukhin <michael.v.zolotukhin@intel.com>
* doc/md.texi: Document define_subst.
* gensupport.c (MAX_OPERANDS): New define.
(operand_data): New.
(match_operand_entries_in_pattern): New.
(used_operands_numbers): New.
(subst_true): New.
(subst_false): New.
(define_subst_queue): New.
(define_subst_tail): New.
(define_subst_attr_queue): New.
(define_subst_attr_tail): New.
(has_subst_attribute): New.
(subst_pattern_match): New.
(get_alternatives_number): New.
(alter_output_for_subst_insn): New.
(alter_attrs_for_subst_insn): New.
(process_substs_on_one_elem): New.
(subst_dup): New.
(process_define_subst): New.
(duplicate_alternatives): New.
(duplicate_each_alternative): New.
(constraints_handler_t): New typedef.
(alter_constraints): New.
(adjust_operands_numbers): New.
(replace_duplicating_operands_in_pattern): New.
(remove_from_queue): New.
(process_rtx): Handle define_subst and define_subst_attr.
(change_subst_attribute): New.
(alter_predicate_for_insn): Fix formatting.
(alter_attrs_for_insn): Likewise.
(alter_output_for_insn): Likewise.
(mark_operands_from_match_dup): New.
(mark_operands_used_in_match_dup): New.
(find_first_unused_number_of_operand): New.
(renumerate_operands_in_pattern): New.
(generate_match_dup): New.
(check_define_attr_duplicates): New.
(init_rtx_reader_args_cb): Add checking for duplicated attrs and
processing of define_subst.
(read_md_rtx): Handle define_subst.
* read-rtl.c (struct subst_attr_to_iter_mapping): New.
(substs): New global.
(apply_subst_iterator): New.
(bind_subst_iter_and_attr): New.
(find_subst_iter_by_attr): New.
(map_attr_string): Handle subst-iterators.
(add_condition_to_rtx): Handle define_subst.
(apply_iterators): Likewise.
(initialize_iterators): Likewise.
(add_define_attr_for_define_subst): New.
(add_define_subst_attr): New.
(read_subst_mapping): New.
(read_rtx): Handle define_subst_attr.
(read_rtx_code): Add subst-attributes recognition during reading of
strings.
* rtl.def (DEFINE_EXPAND): Add vector of attributes.
(DEFINE_SUBST): New.
(DEFINE_SUBST_ATTR): New.
2012-11-19 Tom de Vries <tom@codesourcery.com>
PR rtl-optimization/55315

261
gcc/doc/md.texi
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@ -46,6 +46,8 @@ See the next chapter for information on the C header file.
* Insn Attributes:: Specifying the value of attributes for generated insns.
* Conditional Execution::Generating @code{define_insn} patterns for
predication.
* Define Subst:: Generating @code{define_insn} and @code{define_expand}
patterns from other patterns.
* Constant Definitions::Defining symbolic constants that can be used in the
md file.
* Iterators:: Using iterators to generate patterns from a template.
@ -6756,6 +6758,10 @@ Usually these statements prepare temporary registers for use as
internal operands in the RTL template, but they can also generate RTL
insns directly by calling routines such as @code{emit_insn}, etc.
Any such insns precede the ones that come from the RTL template.
@item
Optionally, a vector containing the values of attributes. @xref{Insn
Attributes}.
@end itemize
Every RTL insn emitted by a @code{define_expand} must match some
@ -8893,6 +8899,213 @@ generates a new pattern
@end smallexample
@end ifset
@ifset INTERNALS
@node Define Subst
@section RTL Templates Transformations
@cindex define_subst
For some hardware architectures there are common cases when the RTL
templates for the instructions can be derived from the other RTL
templates using simple transformations. E.g., @file{i386.md} contains
an RTL template for the ordinary @code{sub} instruction---
@code{*subsi_1}, and for the @code{sub} instruction with subsequent
zero-extension---@code{*subsi_1_zext}. Such cases can be easily
implemented by a single meta-template capable of generating a modified
case based on the initial one:
@findex define_subst
@smallexample
(define_subst "@var{name}"
[@var{input-template}]
"@var{condition}"
[@var{output-template}])
@end smallexample
@var{input-template} is a pattern describing the source RTL template,
which will be transformed.
@var{condition} is a C expression that is conjunct with the condition
from the input-template to generate a condition to be used in the
output-template.
@var{output-template} is a pattern that will be used in the resulting
template.
@code{define_subst} mechanism is tightly coupled with the notion of the
subst attribute (@xref{Subst Iterators}). The use of
@code{define_subst} is triggered by a reference to a subst attribute in
the transforming RTL template. This reference initiates duplication of
the source RTL template and substitution of the attributes with their
values. The source RTL template is left unchanged, while the copy is
transformed by @code{define_subst}. This transformation can fail in the
case when the source RTL template is not matched against the
input-template of the @code{define_subst}. In such case the copy is
deleted.
@code{define_subst} can be used only in @code{define_insn} and
@code{define_expand}, it cannot be used in other expressions (e.g. in
@code{define_insn_and_split}).
@menu
* Define Subst Example:: Example of @code{define_subst} work.
* Define Subst Pattern Matching:: Process of template comparison.
* Define Subst Output Template:: Generation of output template.
@end menu
@node Define Subst Example
@subsection @code{define_subst} Example
@cindex define_subst
To illustrate how @code{define_subst} works, let us examine a simple
template transformation.
Suppose there are two kinds of instructions: one that touches flags and
the other that does not. The instructions of the second type could be
generated with the following @code{define_subst}:
@smallexample
(define_subst "add_clobber_subst"
[(set (match_operand:SI 0 "" "")
(match_operand:SI 1 "" ""))]
""
[(set (match_dup 0)
(match_dup 1))
(clobber (reg:CC FLAGS_REG))]
@end smallexample
This @code{define_subst} can be applied to any RTL pattern containing
@code{set} of mode SI and generates a copy with clobber when it is
applied.
Assume there is an RTL template for a @code{max} instruction to be used
in @code{define_subst} mentioned above:
@smallexample
(define_insn "maxsi"
[(set (match_operand:SI 0 "register_operand" "=r")
(max:SI
(match_operand:SI 1 "register_operand" "r")
(match_operand:SI 2 "register_operand" "r")))]
""
"max\t@{%2, %1, %0|%0, %1, %2@}"
[@dots{}])
@end smallexample
To mark the RTL template for @code{define_subst} application,
subst-attributes are used. They should be declared in advance:
@smallexample
(define_subst_attr "add_clobber_name" "add_clobber_subst" "_noclobber" "_clobber")
@end smallexample
Here @samp{add_clobber_name} is the attribute name,
@samp{add_clobber_subst} is the name of the corresponding
@code{define_subst}, the third argument (@samp{_noclobber}) is the
attribute value that would be substituted into the unchanged version of
the source RTL template, and the last argument (@samp{_clobber}) is the
value that would be substituted into the second, transformed,
version of the RTL template.
Once the subst-attribute has been defined, it should be used in RTL
templates which need to be processed by the @code{define_subst}. So,
the original RTL template should be changed:
@smallexample
(define_insn "maxsi<add_clobber_name>"
[(set (match_operand:SI 0 "register_operand" "=r")
(max:SI
(match_operand:SI 1 "register_operand" "r")
(match_operand:SI 2 "register_operand" "r")))]
""
"max\t@{%2, %1, %0|%0, %1, %2@}"
[@dots{}])
@end smallexample
The result of the @code{define_subst} usage would look like the following:
@smallexample
(define_insn "maxsi_noclobber"
[(set (match_operand:SI 0 "register_operand" "=r")
(max:SI
(match_operand:SI 1 "register_operand" "r")
(match_operand:SI 2 "register_operand" "r")))]
""
"max\t@{%2, %1, %0|%0, %1, %2@}"
[@dots{}])
(define_insn "maxsi_clobber"
[(set (match_operand:SI 0 "register_operand" "=r")
(max:SI
(match_operand:SI 1 "register_operand" "r")
(match_operand:SI 2 "register_operand" "r")))
(clobber (reg:CC FLAGS_REG))]
""
"max\t@{%2, %1, %0|%0, %1, %2@}"
[@dots{}])
@end smallexample
@node Define Subst Pattern Matching
@subsection Pattern Matching in @code{define_subst}
@cindex define_subst
All expressions, allowed in @code{define_insn} or @code{define_expand},
are allowed in the input-template of @code{define_subst}, except
@code{match_par_dup}, @code{match_scratch}, @code{match_parallel}. The
meanings of expressions in the input-template were changed:
@code{match_operand} matches any expression (possibly, a subtree in
RTL-template), if modes of the @code{match_operand} and this expression
are the same, or mode of the @code{match_operand} is @code{VOIDmode}, or
this expression is @code{match_dup}, @code{match_op_dup}. If the
expression is @code{match_operand} too, and predicate of
@code{match_operand} from the input pattern is not empty, then the
predicates are compared. That can be used for more accurate filtering
of accepted RTL-templates.
@code{match_operator} matches common operators (like @code{plus},
@code{minus}), @code{unspec}, @code{unspec_volatile} operators and
@code{match_operator}s from the original pattern if the modes match and
@code{match_operator} from the input pattern has the same number of
operands as the operator from the original pattern.
@node Define Subst Output Template
@subsection Generation of output template in @code{define_subst}
@cindex define_subst
If all necessary checks for @code{define_subst} application pass, a new
RTL-pattern, based on the output-template, is created to replace the old
template. Like in input-patterns, meanings of some RTL expressions are
changed when they are used in output-patterns of a @code{define_subst}.
Thus, @code{match_dup} is used for copying the whole expression from the
original pattern, which matched corresponding @code{match_operand} from
the input pattern.
@code{match_dup N} is used in the output template to be replaced with
the expression from the original pattern, which matched
@code{match_operand N} from the input pattern. As a consequence,
@code{match_dup} cannot be used to point to @code{match_operand}s from
the output pattern, it should always refer to a @code{match_operand}
from the input pattern.
In the output template one can refer to the expressions from the
original pattern and create new ones. For instance, some operands could
be added by means of standard @code{match_operand}.
After replacing @code{match_dup} with some RTL-subtree from the original
pattern, it could happen that several @code{match_operand}s in the
output pattern have the same indexes. It is unknown, how many and what
indexes would be used in the expression which would replace
@code{match_dup}, so such conflicts in indexes are inevitable. To
overcome this issue, @code{match_operands} and @code{match_operators},
which were introduced into the output pattern, are renumerated when all
@code{match_dup}s are replaced.
Number of alternatives in @code{match_operand}s introduced into the
output template @code{M} could differ from the number of alternatives in
the original pattern @code{N}, so in the resultant pattern there would
be @code{N*M} alternatives. Thus, constraints from the original pattern
would be duplicated @code{N} times, constraints from the output pattern
would be duplicated @code{M} times, producing all possible combinations.
@end ifset
@ifset INTERNALS
@node Constant Definitions
@section Constant Definitions
@ -9077,6 +9290,7 @@ facilities to make this process easier.
* Mode Iterators:: Generating variations of patterns for different modes.
* Code Iterators:: Doing the same for codes.
* Int Iterators:: Doing the same for integers.
* Subst Iterators:: Generating variations of patterns for define_subst.
@end menu
@node Mode Iterators
@ -9425,4 +9639,51 @@ This is equivalent to:
@end smallexample
@node Subst Iterators
@subsection Subst Iterators
@cindex subst iterators in @file{.md} files
@findex define_subst
@findex define_subst_attr
Subst iterators are special type of iterators with the following
restrictions: they could not be declared explicitly, they always have
only two values, and they do not have explicit dedicated name.
Subst-iterators are triggered only when corresponding subst-attribute is
used in RTL-pattern.
Subst iterators transform templates in the following way: the templates
are duplicated, the subst-attributes in these templates are replaced
with the corresponding values, and a new attribute is implicitly added
to the given @code{define_insn}/@code{define_expand}. The name of the
added attribute matches the name of @code{define_subst}. Such
attributes are declared implicitly, and it is not allowed to have a
@code{define_attr} named as a @code{define_subst}.
Each subst iterator is linked to a @code{define_subst}. It is declared
implicitly by the first appearance of the corresponding
@code{define_subst_attr}, and it is not allowed to define it explicitly.
Declarations of subst-attributes have the following syntax:
@findex define_subst_attr
@smallexample
(define_subst_attr "@var{name}"
"@var{subst-name}"
"@var{no-subst-value}"
"@var{subst-applied-value}")
@end smallexample
@var{name} is a string with which the given subst-attribute could be
referred to.
@var{subst-name} shows which @code{define_subst} should be applied to an
RTL-template if the given subst-attribute is present in the
RTL-template.
@var{no-subst-value} is a value with which subst-attribute would be
replaced in the first copy of the original RTL-template.
@var{subst-applied-value} is a value with which subst-attribute would be
replaced in the second copy of the original RTL-template.
@end ifset

1117
gcc/gensupport.c
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277
gcc/read-rtl.c
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@ -102,13 +102,28 @@ struct attribute_use {
/* Vector definitions for the above. */
typedef struct attribute_use attribute_use;
/* This struct is used to link subst_attr named ATTR_NAME with
corresponding define_subst named ITER_NAME. */
struct subst_attr_to_iter_mapping
{
char *attr_name;
char *iter_name;
};
/* Hash-table to store links between subst-attributes and
define_substs. */
htab_t subst_attr_to_iter_map = NULL;
/* This global stores name of subst-iterator which is currently being
processed. */
const char *current_iterator_name;
static void validate_const_int (const char *);
static rtx read_rtx_code (const char *);
static rtx read_nested_rtx (void);
static rtx read_rtx_variadic (rtx);
/* The mode and code iterator structures. */
static struct iterator_group modes, codes, ints;
static struct iterator_group modes, codes, ints, substs;
/* All iterators used in the current rtx. */
static vec<mapping_ptr> current_iterators;
@ -178,6 +193,91 @@ apply_int_iterator (void *loc, int value)
*(int *)loc = value;
}
/* This routine adds attribute or does nothing depending on VALUE. When
VALUE is 1, it does nothing - the first duplicate of original
template is kept untouched when it's subjected to a define_subst.
When VALUE isn't 1, the routine modifies RTL-template LOC, adding
attribute, named exactly as define_subst, which later will be
applied. If such attribute has already been added, then no the
routine has no effect. */
static void
apply_subst_iterator (void *loc, int value)
{
rtx rt = (rtx)loc;
rtx new_attr;
rtvec attrs_vec, new_attrs_vec;
int i;
if (value == 1)
return;
gcc_assert (GET_CODE (rt) == DEFINE_INSN
|| GET_CODE (rt) == DEFINE_EXPAND);
attrs_vec = XVEC (rt, 4);
/* If we've already added attribute 'current_iterator_name', then we
have nothing to do now. */
if (attrs_vec)
{
for (i = 0; i < GET_NUM_ELEM (attrs_vec); i++)
{
if (strcmp (XSTR (attrs_vec->elem[i], 0), current_iterator_name) == 0)
return;
}
}
/* Add attribute with subst name - it serves as a mark for
define_subst which later would be applied to this pattern. */
new_attr = rtx_alloc (SET_ATTR);
PUT_CODE (new_attr, SET_ATTR);
XSTR (new_attr, 0) = xstrdup (current_iterator_name);
XSTR (new_attr, 1) = xstrdup ("yes");
if (!attrs_vec)
{
new_attrs_vec = rtvec_alloc (1);
new_attrs_vec->elem[0] = new_attr;
}
else
{
new_attrs_vec = rtvec_alloc (GET_NUM_ELEM (attrs_vec) + 1);
memcpy (&new_attrs_vec->elem[0], &attrs_vec->elem[0],
GET_NUM_ELEM (attrs_vec) * sizeof (rtx));
new_attrs_vec->elem[GET_NUM_ELEM (attrs_vec)] = new_attr;
}
XVEC (rt, 4) = new_attrs_vec;
}
/* Map subst-attribute ATTR to subst iterator ITER. */
static void
bind_subst_iter_and_attr (const char *iter, const char *attr)
{
struct subst_attr_to_iter_mapping *value;
void **slot;
if (!subst_attr_to_iter_map)
subst_attr_to_iter_map =
htab_create (1, leading_string_hash, leading_string_eq_p, 0);
value = XNEW (struct subst_attr_to_iter_mapping);
value->attr_name = xstrdup (attr);
value->iter_name = xstrdup (iter);
slot = htab_find_slot (subst_attr_to_iter_map, value, INSERT);
*slot = value;
}
/* Return name of a subst-iterator, corresponding to subst-attribute ATTR. */
static char*
find_subst_iter_by_attr (const char *attr)
{
char *iter_name = NULL;
struct subst_attr_to_iter_mapping *value;
value = (struct subst_attr_to_iter_mapping*)
htab_find (subst_attr_to_iter_map, &attr);
if (value)
iter_name = value->iter_name;
return iter_name;
}
/* Map attribute string P to its current value. Return null if the attribute
isn't known. */
@ -216,11 +316,23 @@ map_attr_string (const char *p)
/* Find the attribute specification. */
m = (struct mapping *) htab_find (iterator->group->attrs, &attr);
if (m)
/* Find the attribute value associated with the current
iterator value. */
for (v = m->values; v; v = v->next)
if (v->number == iterator->current_value->number)
return v;
{
/* In contrast to code/mode/int iterators, attributes of subst
iterators are linked to one specific subst-iterator. So, if
we are dealing with subst-iterator, we should check if it's
the one which linked with the given attribute. */
if (iterator->group == &substs)
{
char *iter_name = find_subst_iter_by_attr (attr);
if (strcmp (iter_name, iterator->name) != 0)
continue;
}
/* Find the attribute value associated with the current
iterator value. */
for (v = m->values; v; v = v->next)
if (v->number == iterator->current_value->number)
return v;
}
}
return NULL;
}
@ -337,6 +449,7 @@ add_condition_to_rtx (rtx x, const char *extra)
{
case DEFINE_INSN:
case DEFINE_EXPAND:
case DEFINE_SUBST:
XSTR (x, 2) = add_condition_to_string (XSTR (x, 2), extra);
break;
@ -426,6 +539,7 @@ apply_iterators (rtx original, rtx *queue)
htab_traverse (modes.iterators, add_current_iterators, NULL);
htab_traverse (codes.iterators, add_current_iterators, NULL);
htab_traverse (ints.iterators, add_current_iterators, NULL);
htab_traverse (substs.iterators, add_current_iterators, NULL);
gcc_assert (!current_iterators.is_empty ());
for (;;)
@ -435,6 +549,8 @@ apply_iterators (rtx original, rtx *queue)
condition = NULL;
FOR_EACH_VEC_ELT (iterator_uses, i, iuse)
{
if (iuse->iterator->group == &substs)
continue;
v = iuse->iterator->current_value;
iuse->iterator->group->apply_iterator (iuse->ptr, v->number);
condition = join_c_conditions (condition, v->string);
@ -443,6 +559,19 @@ apply_iterators (rtx original, rtx *queue)
x = copy_rtx_for_iterators (original);
add_condition_to_rtx (x, condition);
/* We apply subst iterator after RTL-template is copied, as during
subst-iterator processing, we could add an attribute to the
RTL-template, and we don't want to do it in the original one. */
FOR_EACH_VEC_ELT (iterator_uses, i, iuse)
{
v = iuse->iterator->current_value;
if (iuse->iterator->group == &substs)
{
iuse->ptr = x;
current_iterator_name = iuse->iterator->name;
iuse->iterator->group->apply_iterator (iuse->ptr, v->number);
}
}
/* Add the new rtx to the end of the queue. */
XEXP (*queue, 0) = x;
XEXP (*queue, 1) = NULL_RTX;
@ -538,6 +667,12 @@ initialize_iterators (void)
ints.find_builtin = find_int;
ints.apply_iterator = apply_int_iterator;
substs.attrs = htab_create (13, leading_string_hash, leading_string_eq_p, 0);
substs.iterators = htab_create (13, leading_string_hash,
leading_string_eq_p, 0);
substs.find_builtin = find_int; /* We don't use it, anyway. */
substs.apply_iterator = apply_subst_iterator;
lower = add_mapping (&modes, modes.attrs, "mode");
upper = add_mapping (&modes, modes.attrs, "MODE");
lower_ptr = &lower->values;
@ -780,6 +915,94 @@ read_mapping (struct iterator_group *group, htab_t table)
return m;
}
/* For iterator with name ATTR_NAME generate define_attr with values
'yes' and 'no'. This attribute is used to mark templates to which
define_subst ATTR_NAME should be applied. This attribute is set and
defined implicitly and automatically. */
static void
add_define_attr_for_define_subst (const char *attr_name, rtx *queue)
{
rtx const_str, return_rtx;
return_rtx = rtx_alloc (DEFINE_ATTR);
PUT_CODE (return_rtx, DEFINE_ATTR);
const_str = rtx_alloc (CONST_STRING);
PUT_CODE (const_str, CONST_STRING);
XSTR (const_str, 0) = xstrdup ("no");
XSTR (return_rtx, 0) = xstrdup (attr_name);
XSTR (return_rtx, 1) = xstrdup ("no,yes");
XEXP (return_rtx, 2) = const_str;
XEXP (*queue, 0) = return_rtx;
XEXP (*queue, 1) = NULL_RTX;
}
/* This routine generates DEFINE_SUBST_ATTR expression with operands
ATTR_OPERANDS and places it to QUEUE. */
static void
add_define_subst_attr (const char **attr_operands, rtx *queue)
{
rtx return_rtx;
int i;
return_rtx = rtx_alloc (DEFINE_SUBST_ATTR);
PUT_CODE (return_rtx, DEFINE_SUBST_ATTR);
for (i = 0; i < 4; i++)
XSTR (return_rtx, i) = xstrdup (attr_operands[i]);
XEXP (*queue, 0) = return_rtx;
XEXP (*queue, 1) = NULL_RTX;
}
/* Read define_subst_attribute construction. It has next form:
(define_subst_attribute <attribute_name> <iterator_name> <value1> <value2>)
Attribute is substituted with value1 when no subst is applied and with
value2 in the opposite case.
Attributes are added to SUBST_ATTRS_TABLE.
In case the iterator is encountered for the first time, it's added to
SUBST_ITERS_TABLE. Also, implicit define_attr is generated. */
static void
read_subst_mapping (htab_t subst_iters_table, htab_t subst_attrs_table,
rtx *queue)
{
struct mapping *m;
struct map_value **end_ptr;
const char *attr_operands[4];
rtx * queue_elem = queue;
int i;
for (i = 0; i < 4; i++)
attr_operands[i] = read_string (false);
add_define_subst_attr (attr_operands, queue_elem);
bind_subst_iter_and_attr (attr_operands[1], attr_operands[0]);
m = (struct mapping *) htab_find (substs.iterators, &attr_operands[1]);
if (!m)
{
m = add_mapping (&substs, subst_iters_table, attr_operands[1]);
end_ptr = &m->values;
end_ptr = add_map_value (end_ptr, 1, "");
end_ptr = add_map_value (end_ptr, 2, "");
/* Add element to the queue. */
XEXP (*queue, 1) = rtx_alloc (EXPR_LIST);
queue_elem = &XEXP (*queue, 1);
add_define_attr_for_define_subst (attr_operands[1], queue_elem);
}
m = add_mapping (&substs, subst_attrs_table, attr_operands[0]);
end_ptr = &m->values;
end_ptr = add_map_value (end_ptr, 1, attr_operands[2]);
end_ptr = add_map_value (end_ptr, 2, attr_operands[3]);
}
/* Check newly-created code iterator ITERATOR to see whether every code has the
same format. */
@ -850,6 +1073,15 @@ read_rtx (const char *rtx_name, rtx *x)
read_mapping (&ints, ints.iterators);
return false;
}
if (strcmp (rtx_name, "define_subst_attr") == 0)
{
read_subst_mapping (substs.iterators, substs.attrs, &queue_head);
*x = queue_head;
/* READ_SUBST_MAPPING could generate a new DEFINE_ATTR. Return
TRUE to process it. */
return true;
}
apply_iterators (read_rtx_code (rtx_name), &queue_head);
iterator_uses.truncate (0);
@ -868,12 +1100,15 @@ read_rtx_code (const char *code_name)
{
int i;
RTX_CODE code;
struct mapping *iterator;
struct mapping *iterator, *m;
const char *format_ptr;
struct md_name name;
rtx return_rtx;
int c;
HOST_WIDE_INT tmp_wide;
char *str;
char *start, *end, *ptr;
char tmpstr[256];
/* Linked list structure for making RTXs: */
struct rtx_list
@ -1018,6 +1253,34 @@ read_rtx_code (const char *code_name)
stringbuf = XOBFINISH (&string_obstack, char *);
}
/* Find attr-names in the string. */
ptr = &tmpstr[0];
end = stringbuf;
while ((start = strchr (end, '<')) && (end = strchr (start, '>')))
{
if ((end - start - 1 > 0)
&& (end - start - 1 < (int)sizeof (tmpstr)))
{
strncpy (tmpstr, start+1, end-start-1);
tmpstr[end-start-1] = 0;
end++;
}
else
break;
m = (struct mapping *) htab_find (substs.attrs, &ptr);
if (m != 0)
{
/* Here we should find linked subst-iter. */
str = find_subst_iter_by_attr (ptr);
if (str)
m = (struct mapping *) htab_find (substs.iterators, &str);
else
m = 0;
}
if (m != 0)
record_iterator_use (m, return_rtx);
}
if (star_if_braced)
XTMPL (return_rtx, i) = stringbuf;
else

7
gcc/rtl.def
View File

@ -906,8 +906,9 @@ DEF_RTL_EXPR(DEFINE_PEEPHOLE2, "define_peephole2", "EsES", RTX_EXTRA)
This might, for example, create some RTX's and store them in
elements of `recog_data.operand' for use by the vector of
insn-patterns.
(`operands' is an alias here for `recog_data.operand'). */
DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEss", RTX_EXTRA)
(`operands' is an alias here for `recog_data.operand').
5th: optionally, a vector of attributes for this expand. */
DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEssV", RTX_EXTRA)
/* Define a requirement for delay slots.
1st operand: Condition involving insn attributes that, if true,
@ -1280,6 +1281,8 @@ DEF_RTL_EXPR (ATTR_FLAG, "attr_flag", "s", RTX_EXTRA)
true, the second operand will be used as the value of the conditional. */
DEF_RTL_EXPR(COND, "cond", "Ee", RTX_EXTRA)
DEF_RTL_EXPR(DEFINE_SUBST, "define_subst", "sEsE", RTX_EXTRA)
DEF_RTL_EXPR(DEFINE_SUBST_ATTR, "define_subst_attr", "ssss", RTX_EXTRA)
#endif /* GENERATOR_FILE */
/*