--- /dev/null
+/* RTL iterators
+ Copyright (C) 2014 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/>. */
+
+/* This structure describes the subrtxes of an rtx as follows:
+
+ - if the rtx has no subrtxes, START and COUNT are both 0.
+
+ - if all the subrtxes of an rtx are stored in a contiguous block
+ of XEXPs ("e"s), START is the index of the first XEXP and COUNT
+ is the number of them.
+
+ - otherwise START is arbitrary and COUNT is UCHAR_MAX.
+
+ rtx_all_subrtx_bounds applies to all codes. rtx_nonconst_subrtx_bounds
+ is like rtx_all_subrtx_bounds except that all constant rtxes are treated
+ as having no subrtxes. */
+struct rtx_subrtx_bound_info {
+ unsigned char start;
+ unsigned char count;
+};
+extern rtx_subrtx_bound_info rtx_all_subrtx_bounds[];
+extern rtx_subrtx_bound_info rtx_nonconst_subrtx_bounds[];
+
+/* Return true if CODE has no subrtxes. */
+
+static inline bool
+leaf_code_p (enum rtx_code code)
+{
+ return rtx_all_subrtx_bounds[code].count == 0;
+}
+
+/* Used to iterate over subrtxes of an rtx. T abstracts the type of
+ access. */
+template <typename T>
+class generic_subrtx_iterator
+{
+ static const size_t LOCAL_ELEMS = 16;
+ typedef typename T::value_type value_type;
+ typedef typename T::rtx_type rtx_type;
+ typedef typename T::rtunion_type rtunion_type;
+
+public:
+ struct array_type
+ {
+ array_type ();
+ ~array_type ();
+ value_type stack[LOCAL_ELEMS];
+ vec <value_type, va_heap, vl_embed> *heap;
+ };
+ generic_subrtx_iterator (array_type &, value_type,
+ const rtx_subrtx_bound_info *);
+
+ value_type operator * () const;
+ bool at_end () const;
+ void next ();
+ void skip_subrtxes ();
+ void substitute (value_type);
+
+private:
+ /* The bounds to use for iterating over subrtxes. */
+ const rtx_subrtx_bound_info *m_bounds;
+
+ /* The storage used for the worklist. */
+ array_type &m_array;
+
+ /* The current rtx. */
+ value_type m_current;
+
+ /* The base of the current worklist. */
+ value_type *m_base;
+
+ /* The number of subrtxes in M_BASE. */
+ size_t m_end;
+
+ /* The following booleans shouldn't end up in registers or memory
+ but just direct control flow. */
+
+ /* True if the iteration is over. */
+ bool m_done;
+
+ /* True if we should skip the subrtxes of M_CURRENT. */
+ bool m_skip;
+
+ /* True if M_CURRENT has been replaced with a different rtx. */
+ bool m_substitute;
+
+ static void free_array (array_type &);
+ static size_t add_subrtxes_to_queue (array_type &, value_type *, size_t,
+ rtx_type);
+ static value_type *add_single_to_queue (array_type &, value_type *, size_t,
+ value_type);
+};
+
+template <typename T>
+inline generic_subrtx_iterator <T>::array_type::array_type () : heap (0) {}
+
+template <typename T>
+inline generic_subrtx_iterator <T>::array_type::~array_type ()
+{
+ if (__builtin_expect (heap != 0, false))
+ free_array (*this);
+}
+
+/* Iterate over X and its subrtxes, in arbitrary order. Use ARRAY to
+ store the worklist. We use an external array in order to avoid
+ capturing the fields of this structure when taking the address of
+ the array. Use BOUNDS to find the bounds of simple "e"-string codes. */
+
+template <typename T>
+inline generic_subrtx_iterator <T>::
+generic_subrtx_iterator (array_type &array, value_type x,
+ const rtx_subrtx_bound_info *bounds)
+ : m_bounds (bounds),
+ m_array (array),
+ m_current (x),
+ m_base (m_array.stack),
+ m_end (0),
+ m_done (false),
+ m_skip (false),
+ m_substitute (false)
+{
+}
+
+/* Return the current subrtx. */
+
+template <typename T>
+inline typename T::value_type
+generic_subrtx_iterator <T>::operator * () const
+{
+ return m_current;
+}
+
+/* Return true if the iteration has finished. */
+
+template <typename T>
+inline bool
+generic_subrtx_iterator <T>::at_end () const
+{
+ return m_done;
+}
+
+/* Move on to the next subrtx. */
+
+template <typename T>
+inline void
+generic_subrtx_iterator <T>::next ()
+{
+ if (m_substitute)
+ {
+ m_substitute = false;
+ m_skip = false;
+ return;
+ }
+ if (!m_skip)
+ {
+ /* Add the subrtxes of M_CURRENT. */
+ rtx_type x = T::get_rtx (m_current);
+ if (__builtin_expect (x != 0, true))
+ {
+ enum rtx_code code = GET_CODE (x);
+ ssize_t count = m_bounds[code].count;
+ if (count > 0)
+ {
+ /* Handle the simple case of a single "e" block that is known
+ to fit into the current array. */
+ if (__builtin_expect (m_end + count <= LOCAL_ELEMS + 1, true))
+ {
+ /* Set M_CURRENT to the first subrtx and queue the rest. */
+ ssize_t start = m_bounds[code].start;
+ rtunion_type *src = &x->u.fld[start];
+ if (__builtin_expect (count > 2, false))
+ m_base[m_end++] = T::get_value (src[2].rt_rtx);
+ if (count > 1)
+ m_base[m_end++] = T::get_value (src[1].rt_rtx);
+ m_current = T::get_value (src[0].rt_rtx);
+ return;
+ }
+ /* Handle cases which aren't simple "e" sequences or where
+ the sequence might overrun M_BASE. */
+ count = add_subrtxes_to_queue (m_array, m_base, m_end, x);
+ if (count > 0)
+ {
+ m_end += count;
+ if (m_end > LOCAL_ELEMS)
+ m_base = m_array.heap->address ();
+ m_current = m_base[--m_end];
+ return;
+ }
+ }
+ }
+ }
+ else
+ m_skip = false;
+ if (m_end == 0)
+ m_done = true;
+ else
+ m_current = m_base[--m_end];
+}
+
+/* Skip the subrtxes of the current rtx. */
+
+template <typename T>
+inline void
+generic_subrtx_iterator <T>::skip_subrtxes ()
+{
+ m_skip = true;
+}
+
+/* Ignore the subrtxes of the current rtx and look at X instead. */
+
+template <typename T>
+inline void
+generic_subrtx_iterator <T>::substitute (value_type x)
+{
+ m_substitute = true;
+ m_current = x;
+}
+
+/* Iterators for const_rtx. */
+struct const_rtx_accessor
+{
+ typedef const_rtx value_type;
+ typedef const_rtx rtx_type;
+ typedef const rtunion rtunion_type;
+ static rtx_type get_rtx (value_type x) { return x; }
+ static value_type get_value (rtx_type x) { return x; }
+};
+typedef generic_subrtx_iterator <const_rtx_accessor> subrtx_iterator;
+
+/* Iterators for non-constant rtx. */
+struct rtx_var_accessor
+{
+ typedef rtx value_type;
+ typedef rtx rtx_type;
+ typedef rtunion rtunion_type;
+ static rtx_type get_rtx (value_type x) { return x; }
+ static value_type get_value (rtx_type x) { return x; }
+};
+typedef generic_subrtx_iterator <rtx_var_accessor> subrtx_var_iterator;
+
+/* Iterators for rtx *. */
+struct rtx_ptr_accessor
+{
+ typedef rtx *value_type;
+ typedef rtx rtx_type;
+ typedef rtunion rtunion_type;
+ static rtx_type get_rtx (value_type ptr) { return *ptr; }
+ static value_type get_value (rtx_type &x) { return &x; }
+};
+typedef generic_subrtx_iterator <rtx_ptr_accessor> subrtx_ptr_iterator;
+
+#define ALL_BOUNDS rtx_all_subrtx_bounds
+#define NONCONST_BOUNDS rtx_nonconst_subrtx_bounds
+
+/* Use ITER to iterate over const_rtx X and its recursive subrtxes,
+ using subrtx_iterator::array ARRAY as the storage for the worklist.
+ ARRAY can be reused for multiple consecutive iterations but shouldn't
+ be shared by two concurrent iterations. TYPE is ALL if all subrtxes
+ are of interest or NONCONST if it is safe to ignore subrtxes of
+ constants. */
+#define FOR_EACH_SUBRTX(ITER, ARRAY, X, TYPE) \
+ for (subrtx_iterator ITER (ARRAY, X, TYPE##_BOUNDS); !ITER.at_end (); \
+ ITER.next ())
+
+/* Like FOR_EACH_SUBRTX, but iterate over subrtxes of an rtx X. */
+#define FOR_EACH_SUBRTX_VAR(ITER, ARRAY, X, TYPE) \
+ for (subrtx_var_iterator ITER (ARRAY, X, TYPE##_BOUNDS); !ITER.at_end (); \
+ ITER.next ())
+
+/* Like FOR_EACH_SUBRTX, but iterate over subrtx pointers of rtx pointer X.
+ For example, if X is &PATTERN (insn) and the pattern is a SET, iterate
+ over &PATTERN (insn), &SET_DEST (PATTERN (insn)), etc. */
+#define FOR_EACH_SUBRTX_PTR(ITER, ARRAY, X, TYPE) \
+ for (subrtx_ptr_iterator ITER (ARRAY, X, TYPE##_BOUNDS); !ITER.at_end (); \
+ ITER.next ())
#include "tree.h"
#include "emit-rtl.h" /* FIXME: Can go away once crtl is moved to rtl.h. */
#include "addresses.h"
+#include "rtl-iter.h"
/* Forward declarations */
static void set_of_1 (rtx, const_rtx, void *);
-1 if a code has no such operand. */
static int non_rtx_starting_operands[NUM_RTX_CODE];
+rtx_subrtx_bound_info rtx_all_subrtx_bounds[NUM_RTX_CODE];
+rtx_subrtx_bound_info rtx_nonconst_subrtx_bounds[NUM_RTX_CODE];
+
/* Truncation narrows the mode from SOURCE mode to DESTINATION mode.
If TARGET_MODE_REP_EXTENDED (DESTINATION, DESTINATION_REP) is
SIGN_EXTEND then while narrowing we also have to enforce the
static unsigned int
num_sign_bit_copies_in_rep[MAX_MODE_INT + 1][MAX_MODE_INT + 1];
\f
+/* Store X into index I of ARRAY. ARRAY is known to have at least I
+ elements. Return the new base of ARRAY. */
+
+template <typename T>
+typename T::value_type *
+generic_subrtx_iterator <T>::add_single_to_queue (array_type &array,
+ value_type *base,
+ size_t i, value_type x)
+{
+ if (base == array.stack)
+ {
+ if (i < LOCAL_ELEMS)
+ {
+ base[i] = x;
+ return base;
+ }
+ gcc_checking_assert (i == LOCAL_ELEMS);
+ vec_safe_grow (array.heap, i + 1);
+ base = array.heap->address ();
+ memcpy (base, array.stack, sizeof (array.stack));
+ base[LOCAL_ELEMS] = x;
+ return base;
+ }
+ unsigned int length = array.heap->length ();
+ if (length > i)
+ {
+ gcc_checking_assert (base == array.heap->address ());
+ base[i] = x;
+ return base;
+ }
+ else
+ {
+ gcc_checking_assert (i == length);
+ vec_safe_push (array.heap, x);
+ return array.heap->address ();
+ }
+}
+
+/* Add the subrtxes of X to worklist ARRAY, starting at END. Return the
+ number of elements added to the worklist. */
+
+template <typename T>
+size_t
+generic_subrtx_iterator <T>::add_subrtxes_to_queue (array_type &array,
+ value_type *base,
+ size_t end, rtx_type x)
+{
+ const char *format = GET_RTX_FORMAT (GET_CODE (x));
+ size_t orig_end = end;
+ for (int i = 0; format[i]; ++i)
+ if (format[i] == 'e')
+ {
+ value_type subx = T::get_value (x->u.fld[i].rt_rtx);
+ if (__builtin_expect (end < LOCAL_ELEMS, true))
+ base[end++] = subx;
+ else
+ base = add_single_to_queue (array, base, end++, subx);
+ }
+ else if (format[i] == 'E')
+ {
+ int length = GET_NUM_ELEM (x->u.fld[i].rt_rtvec);
+ rtx *vec = x->u.fld[i].rt_rtvec->elem;
+ if (__builtin_expect (end + length <= LOCAL_ELEMS, true))
+ for (int j = 0; j < length; j++)
+ base[end++] = T::get_value (vec[j]);
+ else
+ for (int j = 0; j < length; j++)
+ base = add_single_to_queue (array, base, end++,
+ T::get_value (vec[j]));
+ }
+ return end - orig_end;
+}
+
+template <typename T>
+void
+generic_subrtx_iterator <T>::free_array (array_type &array)
+{
+ vec_free (array.heap);
+}
+
+template <typename T>
+const size_t generic_subrtx_iterator <T>::LOCAL_ELEMS;
+
+template class generic_subrtx_iterator <const_rtx_accessor>;
+template class generic_subrtx_iterator <rtx_var_accessor>;
+template class generic_subrtx_iterator <rtx_ptr_accessor>;
+
/* Return 1 if the value of X is unstable
(would be different at a different point in the program).
The frame pointer, arg pointer, etc. are considered stable
return false;
}
\f
+/* Return true if RTX code CODE has a single sequence of zero or more
+ "e" operands and no rtvec operands. Initialize its rtx_all_subrtx_bounds
+ entry in that case. */
+
+static bool
+setup_reg_subrtx_bounds (unsigned int code)
+{
+ const char *format = GET_RTX_FORMAT ((enum rtx_code) code);
+ unsigned int i = 0;
+ for (; format[i] != 'e'; ++i)
+ {
+ if (!format[i])
+ /* No subrtxes. Leave start and count as 0. */
+ return true;
+ if (format[i] == 'E' || format[i] == 'V')
+ return false;
+ }
+
+ /* Record the sequence of 'e's. */
+ rtx_all_subrtx_bounds[code].start = i;
+ do
+ ++i;
+ while (format[i] == 'e');
+ rtx_all_subrtx_bounds[code].count = i - rtx_all_subrtx_bounds[code].start;
+ /* rtl-iter.h relies on this. */
+ gcc_checking_assert (rtx_all_subrtx_bounds[code].count <= 3);
+
+ for (; format[i]; ++i)
+ if (format[i] == 'E' || format[i] == 'V' || format[i] == 'e')
+ return false;
+
+ return true;
+}
+
/* Initialize non_rtx_starting_operands, which is used to speed up
- for_each_rtx. */
+ for_each_rtx, and rtx_all_subrtx_bounds. */
void
init_rtlanal (void)
{
const char *format = GET_RTX_FORMAT (i);
const char *first = strpbrk (format, "eEV");
non_rtx_starting_operands[i] = first ? first - format : -1;
+ if (!setup_reg_subrtx_bounds (i))
+ rtx_all_subrtx_bounds[i].count = UCHAR_MAX;
+ if (GET_RTX_CLASS (i) != RTX_CONST_OBJ)
+ rtx_nonconst_subrtx_bounds[i] = rtx_all_subrtx_bounds[i];
}
init_num_sign_bit_copies_in_rep ();
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