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Implement support for int iterators. 

From-SVN: r188726
This commit is contained in:
Tejas Belagod 2012-06-18 11:43:03 +01:00 committed by Tejas Belagod
parent b7104c55e7
commit 57a4717bd3
3 changed files with 131 additions and 5 deletions
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13
gcc/ChangeLog
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@ -1,3 +1,16 @@
2012-06-18 Tejas Belagod <tejas.belagod@arm.com>
* doc/md.texi: Document int iterators.
* read-rtl.c (ints): New iterator group.
(find_int): Int iterator group callback.
(apply_int_iterator): Likewise.
(apply_iterators): Traverse int iterator table and add all the used
iterators to list.
(initialize_iterators): Initialize data structures and callbacks for int
iterators.
(read_rtx): Parse and read mappings for int iterators.
(read_rtx_code): Record int iterator usage.
2012-06-18 Richard Sandiford <rdsandiford@googlemail.com>
PR middle-end/53698

78
gcc/doc/md.texi
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@ -8895,6 +8895,7 @@ facilities to make this process easier.
@menu
* Mode Iterators:: Generating variations of patterns for different modes.
* Code Iterators:: Doing the same for codes.
* Int Iterators:: Doing the same for integers.
@end menu
@node Mode Iterators
@ -9166,4 +9167,81 @@ This is equivalent to:
@dots{}
@end smallexample
@node Int Iterators
@subsection Int Iterators
@cindex int iterators in @file{.md} files
@findex define_int_iterator
@findex define_int_attr
Int iterators operate in a similar way to code iterators. @xref{Code Iterators}.
The construct:
@smallexample
(define_int_iterator @var{name} [(@var{int1} "@var{cond1}") @dots{} (@var{intn} "@var{condn}")])
@end smallexample
defines a pseudo integer constant @var{name} that can be instantiated as
@var{inti} if condition @var{condi} is true. Each @var{int}
must have the same rtx format. @xref{RTL Classes}. Int iterators can appear
in only those rtx fields that have 'i' as the specifier. This means that
each @var{int} has to be a constant defined using define_constant or
define_c_enum.
As with mode and code iterators, each pattern that uses @var{name} will be
expanded @var{n} times, once with all uses of @var{name} replaced by
@var{int1}, once with all uses replaced by @var{int2}, and so on.
@xref{Defining Mode Iterators}.
It is possible to define attributes for ints as well as for codes and modes.
Attributes are defined using:
@smallexample
(define_int_attr @var{name} [(@var{int1} "@var{value1}") @dots{} (@var{intn} "@var{valuen}")])
@end smallexample
Here's an example of int iterators in action, taken from the ARM port:
@smallexample
(define_int_iterator QABSNEG [UNSPEC_VQABS UNSPEC_VQNEG])
(define_int_attr absneg [(UNSPEC_VQABS "abs") (UNSPEC_VQNEG "neg")])
(define_insn "neon_vq<absneg><mode>"
[(set (match_operand:VDQIW 0 "s_register_operand" "=w")
(unspec:VDQIW [(match_operand:VDQIW 1 "s_register_operand" "w")
(match_operand:SI 2 "immediate_operand" "i")]
QABSNEG))]
"TARGET_NEON"
"vq<absneg>.<V_s_elem>\t%<V_reg>0, %<V_reg>1"
[(set_attr "neon_type" "neon_vqneg_vqabs")]
)
@end smallexample
This is equivalent to:
@smallexample
(define_insn "neon_vqabs<mode>"
[(set (match_operand:VDQIW 0 "s_register_operand" "=w")
(unspec:VDQIW [(match_operand:VDQIW 1 "s_register_operand" "w")
(match_operand:SI 2 "immediate_operand" "i")]
UNSPEC_VQABS))]
"TARGET_NEON"
"vqabs.<V_s_elem>\t%<V_reg>0, %<V_reg>1"
[(set_attr "neon_type" "neon_vqneg_vqabs")]
)
(define_insn "neon_vqneg<mode>"
[(set (match_operand:VDQIW 0 "s_register_operand" "=w")
(unspec:VDQIW [(match_operand:VDQIW 1 "s_register_operand" "w")
(match_operand:SI 2 "immediate_operand" "i")]
UNSPEC_VQNEG))]
"TARGET_NEON"
"vqneg.<V_s_elem>\t%<V_reg>0, %<V_reg>1"
[(set_attr "neon_type" "neon_vqneg_vqabs")]
)
@end smallexample
@end ifset

45
gcc/read-rtl.c
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@ -114,7 +114,7 @@ static rtx read_nested_rtx (void);
static rtx read_rtx_variadic (rtx);
/* The mode and code iterator structures. */
static struct iterator_group modes, codes;
static struct iterator_group modes, codes, ints;
/* All iterators used in the current rtx. */
static VEC (mapping_ptr, heap) *current_iterators;
@ -165,6 +165,25 @@ apply_code_iterator (void *loc, int code)
PUT_CODE ((rtx) loc, (enum rtx_code) code);
}
/* Implementations of the iterator_group callbacks for ints. */
/* Since GCC does not construct a table of valid constants,
we have to accept any int as valid. No cross-checking can
be done. */
static int
find_int (const char *name)
{
validate_const_int (name);
return atoi (name);
}
static void
apply_int_iterator (void *loc, int value)
{
*(int *)loc = value;
}
/* Map attribute string P to its current value. Return null if the attribute
isn't known. */
@ -412,6 +431,7 @@ apply_iterators (rtx original, rtx *queue)
definition order within each group. */
htab_traverse (modes.iterators, add_current_iterators, NULL);
htab_traverse (codes.iterators, add_current_iterators, NULL);
htab_traverse (ints.iterators, add_current_iterators, NULL);
gcc_assert (!VEC_empty (mapping_ptr, current_iterators));
for (;;)
@ -518,6 +538,12 @@ initialize_iterators (void)
codes.find_builtin = find_code;
codes.apply_iterator = apply_code_iterator;
ints.attrs = htab_create (13, leading_string_hash, leading_string_eq_p, 0);
ints.iterators = htab_create (13, leading_string_hash,
leading_string_eq_p, 0);
ints.find_builtin = find_int;
ints.apply_iterator = apply_int_iterator;
lower = add_mapping (&modes, modes.attrs, "mode");
upper = add_mapping (&modes, modes.attrs, "MODE");
lower_ptr = &lower->values;
@ -827,6 +853,16 @@ read_rtx (const char *rtx_name, rtx *x)
check_code_iterator (read_mapping (&codes, codes.iterators));
return false;
}
if (strcmp (rtx_name, "define_int_attr") == 0)
{
read_mapping (&ints, ints.attrs);
return false;
}
if (strcmp (rtx_name, "define_int_iterator") == 0)
{
read_mapping (&ints, ints.iterators);
return false;
}
apply_iterators (read_rtx_code (rtx_name), &queue_head);
VEC_truncate (iterator_use, iterator_uses, 0);
@ -850,7 +886,6 @@ read_rtx_code (const char *code_name)
struct md_name name;
rtx return_rtx;
int c;
int tmp_int;
HOST_WIDE_INT tmp_wide;
/* Linked list structure for making RTXs: */
@ -1026,10 +1061,10 @@ read_rtx_code (const char *code_name)
case 'i':
case 'n':
/* Can be an iterator or an integer constant. */
read_name (&name);
validate_const_int (name.string);
tmp_int = atoi (name.string);
XINT (return_rtx, i) = tmp_int;
record_potential_iterator_use (&ints, &XINT (return_rtx, i),
name.string);
break;
default: