gcc/ChangeLog:
* Makefile.in: Add new object file.
* df-problems.cc (struct df_live_subreg_problem_data):
The data of the new live_subreg problem.
(need_track_subreg): New function.
(get_range): Ditto.
(remove_subreg_range): Ditto.
(add_subreg_range): Ditto.
(df_live_subreg_free_bb_info): Ditto.
(df_live_subreg_alloc): Ditto.
(df_live_subreg_reset): Ditto.
(df_live_subreg_bb_local_compute): Ditto.
(df_live_subreg_local_compute): Ditto.
(df_live_subreg_init): Ditto.
(df_live_subreg_check_result): Ditto.
(df_live_subreg_confluence_0): Ditto.
(df_live_subreg_confluence_n): Ditto.
(df_live_subreg_transfer_function): Ditto.
(df_live_subreg_finalize): Ditto.
(df_live_subreg_free): Ditto.
(df_live_subreg_top_dump): Ditto.
(df_live_subreg_bottom_dump): Ditto.
(df_live_subreg_add_problem): Ditto.
* df.h (enum df_problem_id): Add live_subreg id.
(DF_LIVE_SUBREG_INFO): Data accessor.
(DF_LIVE_SUBREG_IN): Ditto.
(DF_LIVE_SUBREG_OUT): Ditto.
(DF_LIVE_SUBREG_FULL_IN): Ditto.
(DF_LIVE_SUBREG_FULL_OUT): Ditto.
(DF_LIVE_SUBREG_PARTIAL_IN): Ditto.
(DF_LIVE_SUBREG_PARTIAL_OUT): Ditto.
(DF_LIVE_SUBREG_RANGE_IN): Ditto.
(DF_LIVE_SUBREG_RANGE_OUT): Ditto.
(class subregs_live): New class.
(class basic_block_subreg_live_info): Ditto.
(class df_live_subreg_bb_info): Ditto.
(df_live_subreg): Ditto.
(df_live_subreg_add_problem): Ditto.
(df_live_subreg_finalize): Ditto.
(class subreg_range): Ditto.
(need_track_subreg): Ditto.
(remove_subreg_range): Ditto.
(add_subreg_range): Ditto.
(df_live_subreg_get_bb_info): Ditto.
* regs.h (get_nblocks): Helper function.
* timevar.def (TV_DF_LIVE_SUBREG): New timevar.
* subreg-live-range.cc: New file.
* subreg-live-range.h: New file.
---
gcc/Makefile.in | 1 +
gcc/df-problems.cc | 889 ++++++++++++++++++++++++++++++++++++++-
gcc/df.h | 67 +++
gcc/regs.h | 7 +
gcc/subreg-live-range.cc | 628 +++++++++++++++++++++++++++
gcc/subreg-live-range.h | 333 +++++++++++++++
gcc/timevar.def | 1 +
7 files changed, 1925 insertions(+), 1 deletion(-)
create mode 100644 gcc/subreg-live-range.cc
create mode 100644 gcc/subreg-live-range.h
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 29cec21c825..e4403b5a30c 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -1675,6 +1675,7 @@ OBJS = \
store-motion.o \
streamer-hooks.o \
stringpool.o \
+ subreg-live-range.o \
substring-locations.o \
target-globals.o \
targhooks.o \
diff --git a/gcc/df-problems.cc b/gcc/df-problems.cc
index d2cfaf7f50f..2585c762fd1 100644
--- a/gcc/df-problems.cc
+++ b/gcc/df-problems.cc
@@ -28,6 +28,7 @@ along with GCC; see the file COPYING3. If not see
#include "target.h"
#include "rtl.h"
#include "df.h"
+#include "subreg-live-range.h"
#include "memmodel.h"
#include "tm_p.h"
#include "insn-config.h"
@@ -1344,8 +1345,894 @@ df_lr_verify_transfer_functions (void)
bitmap_clear (&all_blocks);
}
+/*----------------------------------------------------------------------------
+ REGISTER AND SUBREG LIVES
+ Like DF_RL, but fine-grained tracking of subreg lifecycle.
+
----------------------------------------------------------------------------*/
+
+/* Private data used to verify the solution for this problem. */
+struct df_live_subreg_problem_data
+{
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack live_subreg_bitmaps;
+ bool has_subreg_live_p;
+};
+
+/* Helper functions */
+
+/* Return true if REGNO is a pseudo and MODE is a multil regs size. */
+bool
+need_track_subreg (int regno, machine_mode reg_mode)
+{
+ poly_int64 total_size = GET_MODE_SIZE (reg_mode);
+ poly_int64 natural_size = REGMODE_NATURAL_SIZE (reg_mode);
+ return maybe_gt (total_size, natural_size)
+ && multiple_p (total_size, natural_size)
+ && regno >= FIRST_PSEUDO_REGISTER;
+}
+
+/* Return subreg_range of REF. */
+static subreg_range
+get_range (df_ref ref)
+{
+ rtx reg = DF_REF_REAL_REG (ref);
+ machine_mode reg_mode = GET_MODE (reg);
+
+ if (!read_modify_subreg_p (DF_REF_REG (ref)))
+ return subreg_range (0, get_nblocks (reg_mode));
+
+ rtx subreg = DF_REF_REG (ref);
+ machine_mode subreg_mode = GET_MODE (subreg);
+ poly_int64 offset = SUBREG_BYTE (subreg);
+ int nblocks = get_nblocks (reg_mode);
+ poly_int64 unit_size = REGMODE_NATURAL_SIZE (reg_mode);
+ poly_int64 subreg_size = GET_MODE_SIZE (subreg_mode);
+ poly_int64 left = offset + subreg_size;
+
+ int subreg_start = -1;
+ int subreg_nblocks = -1;
+ for (int i = 0; i < nblocks; i += 1)
+ {
+ poly_int64 right = unit_size * (i + 1);
+ if (subreg_start < 0 && maybe_lt (offset, right))
+ subreg_start = i;
+ if (subreg_nblocks < 0 && maybe_le (left, right))
+ {
+ subreg_nblocks = i + 1 - subreg_start;
+ break;
+ }
+ }
+ gcc_assert (subreg_start >= 0 && subreg_nblocks > 0);
+
+ return subreg_range (subreg_start, subreg_start + subreg_nblocks);
+}
+
+/* Remove REF from BB_INFO use. */
+void
+remove_subreg_range (basic_block_subreg_live_info *bb_info, unsigned int regno,
+ machine_mode mode, const subreg_range &range)
+{
+ int max = get_nblocks (mode);
+ bitmap full = &bb_info->full_use;
+ bitmap partial = &bb_info->partial_use;
+ subregs_live *range_live = bb_info->range_use;
+
+ if (!range.full_p (max))
+ {
+ if (bitmap_bit_p (full, regno))
+ {
+ bitmap_clear_bit (full, regno);
+ gcc_assert (!bitmap_bit_p (partial, regno));
+ gcc_assert (range_live->empty_p (regno));
+ subreg_ranges temp = subreg_ranges (max);
+ temp.make_full ();
+ temp.remove_range (max, range);
+ range_live->add_ranges (regno, temp);
+ bitmap_set_bit (partial, regno);
+ return;
+ }
+ else if (bitmap_bit_p (partial, regno))
+ {
+ range_live->remove_range (regno, max, range);
+ if (range_live->empty_p (regno))
+ bitmap_clear_bit (partial, regno);
+ }
+ }
+ else if (bitmap_bit_p (full, regno))
+ {
+ bitmap_clear_bit (full, regno);
+ gcc_assert (!bitmap_bit_p (partial, regno));
+ }
+ else if (bitmap_bit_p (partial, regno))
+ {
+ bitmap_clear_bit (partial, regno);
+ range_live->remove_live (regno);
+ }
+}
+
+/* Return true if ref is a tracked subreg access. */
+bool
+remove_subreg_range (basic_block_subreg_live_info *bb_info, df_ref ref)
+{
+ unsigned int regno = DF_REF_REGNO (ref);
+ machine_mode mode = GET_MODE (DF_REF_REAL_REG (ref));
+ bool subreg_p = read_modify_subreg_p (DF_REF_REG (ref));
+
+ if (need_track_subreg (regno, mode))
+ {
+ remove_subreg_range (bb_info, regno, mode, get_range (ref));
+ return subreg_p;
+ }
+ else
+ {
+ bitmap_clear_bit (&bb_info->full_use, regno);
+ gcc_assert (!bitmap_bit_p (&bb_info->partial_use, regno));
+ gcc_assert (!bitmap_bit_p (&bb_info->partial_def, regno));
+ return false;
+ }
+}
+
+/* add REF to BB_INFO def/use. */
+void
+add_subreg_range (basic_block_subreg_live_info *bb_info, unsigned int regno,
+ machine_mode mode, const subreg_range &range, bool is_def)
+{
+ int max = get_nblocks (mode);
+ bitmap full = is_def ? &bb_info->full_def : &bb_info->full_use;
+ bitmap partial = is_def ? &bb_info->partial_def : &bb_info->partial_use;
+ subregs_live *range_live = is_def ? bb_info->range_def : bb_info->range_use;
+
+ if (!range.full_p (max))
+ {
+ if (bitmap_bit_p (full, regno))
+ return;
+ range_live->add_range (regno, max, range);
+ if (range_live->full_p (regno))
+ {
+ bitmap_set_bit (full, regno);
+ gcc_assert (bitmap_bit_p (partial, regno));
+ bitmap_clear_bit (partial, regno);
+ range_live->remove_live (regno);
+ }
+ else if (!bitmap_bit_p (partial, regno))
+ bitmap_set_bit (partial, regno);
+ }
+ else if (!bitmap_bit_p (full, regno))
+ {
+ bitmap_set_bit (full, regno);
+ if (bitmap_bit_p (partial, regno))
+ {
+ bitmap_clear_bit (partial, regno);
+ range_live->remove_live (regno);
+ }
+ }
+}
+
+/* Return true if ref is a tracked subreg access. */
+bool
+add_subreg_range (basic_block_subreg_live_info *bb_info, df_ref ref,
+ bool is_def)
+{
+ unsigned int regno = DF_REF_REGNO (ref);
+ machine_mode mode = GET_MODE (DF_REF_REAL_REG (ref));
+ bool subreg_p = read_modify_subreg_p (DF_REF_REG (ref));
+
+ if (need_track_subreg (regno, mode))
+ {
+ add_subreg_range (bb_info, regno, mode, get_range (ref), is_def);
+ return subreg_p;
+ }
+ else
+ {
+ bitmap full = is_def ? &bb_info->full_def : &bb_info->full_use;
+ bitmap partial = is_def ? &bb_info->partial_def : &bb_info->partial_use;
+ bitmap_set_bit (full, regno);
+ gcc_assert (!bitmap_bit_p (partial, regno));
+
+ if (is_def && DF_REF_FLAGS (ref) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ add_subreg_range (bb_info, ref, false);
+ return false;
+ }
+}
+
+/* Free basic block info. */
+
+static void
+df_live_subreg_free_bb_info (basic_block bb ATTRIBUTE_UNUSED, void *vbb_info)
+{
+ df_live_subreg_bb_info *bb_info = (df_live_subreg_bb_info *) vbb_info;
+ if (bb_info)
+ {
+ delete bb_info->range_def;
+ bb_info->range_def = NULL;
+ delete bb_info->range_use;
+ bb_info->range_use = NULL;
+ delete bb_info->range_in;
+ bb_info->range_in = NULL;
+ delete bb_info->range_out;
+ bb_info->range_out = NULL;
+
+ bitmap_clear (&bb_info->full_use);
+ bitmap_clear (&bb_info->partial_use);
+ bitmap_clear (&bb_info->full_def);
+ bitmap_clear (&bb_info->partial_def);
+ bitmap_clear (&bb_info->all_in);
+ bitmap_clear (&bb_info->full_in);
+ bitmap_clear (&bb_info->partial_in);
+ bitmap_clear (&bb_info->all_out);
+ bitmap_clear (&bb_info->full_out);
+ bitmap_clear (&bb_info->partial_out);
+ }
+}
+
+/* Allocate or reset bitmaps for DF_LIVE_SUBREG blocks. The solution bits are
+ not touched unless the block is new. */
+
+static void
+df_live_subreg_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
+{
+ struct df_live_subreg_problem_data *problem_data;
+ df_grow_bb_info (df_live_subreg);
+ if (df_live_subreg->problem_data)
+ problem_data
+ = (struct df_live_subreg_problem_data *) df_live_subreg->problem_data;
+ else
+ {
+ problem_data = XNEW (struct df_live_subreg_problem_data);
+ df_live_subreg->problem_data = problem_data;
+
+ bitmap_obstack_initialize (&problem_data->live_subreg_bitmaps);
+ problem_data->has_subreg_live_p = false;
+ }
+
+ basic_block bb;
+ FOR_EACH_BB_FN (bb, cfun)
+ bitmap_set_bit (df_live_subreg->out_of_date_transfer_functions, bb->index);
+
+ bitmap_set_bit (df_live_subreg->out_of_date_transfer_functions, ENTRY_BLOCK);
+ bitmap_set_bit (df_live_subreg->out_of_date_transfer_functions, EXIT_BLOCK);
+
+ unsigned int bb_index;
+ bitmap_iterator bi;
+ EXECUTE_IF_SET_IN_BITMAP (df_live_subreg->out_of_date_transfer_functions, 0,
+ bb_index, bi)
+ {
+ df_live_subreg_bb_info *bb_info = df_live_subreg_get_bb_info (bb_index);
+
+ /* When bitmaps are already initialized, just clear them. */
+ if (bb_info->full_use.obstack)
+ {
+ bitmap_clear (&bb_info->full_def);
+ bitmap_clear (&bb_info->partial_def);
+ bitmap_clear (&bb_info->full_use);
+ bitmap_clear (&bb_info->partial_use);
+ bitmap_clear (&bb_info->all_in);
+ bitmap_clear (&bb_info->full_in);
+ bitmap_clear (&bb_info->partial_in);
+ bitmap_clear (&bb_info->all_out);
+ bitmap_clear (&bb_info->full_out);
+ bitmap_clear (&bb_info->partial_out);
+ }
+ else
+ {
+ bitmap_initialize (&bb_info->full_def,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->partial_def,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->full_use,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->partial_use,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->all_in,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->full_in,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->partial_in,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->all_out,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->full_out,
+ &problem_data->live_subreg_bitmaps);
+ bitmap_initialize (&bb_info->partial_out,
+ &problem_data->live_subreg_bitmaps);
+ }
+
+ if (bb_info->range_def)
+ {
+ bb_info->range_def->clear ();
+ bb_info->range_use->clear ();
+ bb_info->range_in->clear ();
+ bb_info->range_out->clear ();
+ }
+ else
+ {
+ bb_info->range_def = new subregs_live ();
+ bb_info->range_use = new subregs_live ();
+ bb_info->range_in = new subregs_live ();
+ bb_info->range_out = new subregs_live ();
+ }
+ }
+ df_live_subreg->optional_p = true;
+}
+
+/* Reset the global solution for recalculation. */
+
+static void
+df_live_subreg_reset (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ df_live_subreg_bb_info *bb_info = df_live_subreg_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (&bb_info->all_in);
+ bitmap_clear (&bb_info->full_in);
+ bitmap_clear (&bb_info->partial_in);
+ bitmap_clear (&bb_info->all_out);
+ bitmap_clear (&bb_info->full_out);
+ bitmap_clear (&bb_info->partial_out);
+ bb_info->range_in->clear ();
+ bb_info->range_out->clear ();
+ }
+}
+
+/* Compute local live register info for basic block BB. */
+
+static void
+df_live_subreg_bb_local_compute (unsigned int bb_index)
+{
+ basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index);
+ df_live_subreg_bb_info *bb_info = df_live_subreg_get_bb_info (bb_index);
+ df_live_subreg_problem_data *problem_data
+ = (df_live_subreg_problem_data *) df_live_subreg->problem_data;
+ rtx_insn *insn;
+ df_ref def, use;
+
+ /* Process the registers set in an exception handler. */
+ FOR_EACH_ARTIFICIAL_DEF (def, bb_index)
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
+ {
+ problem_data->has_subreg_live_p
+ |= add_subreg_range (bb_info, def, true);
+ problem_data->has_subreg_live_p |= remove_subreg_range (bb_info, def);
+ }
+
+ /* Process the hardware registers that are always live. */
+ FOR_EACH_ARTIFICIAL_USE (use, bb_index)
+ /* Add use to set of uses in this BB. */
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ problem_data->has_subreg_live_p |= add_subreg_range (bb_info, use);
+
+ FOR_BB_INSNS_REVERSE (bb, insn)
+ {
+ if (!NONDEBUG_INSN_P (insn))
+ continue;
+
+ df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
+ FOR_EACH_INSN_INFO_DEF (def, insn_info)
+ {
+ problem_data->has_subreg_live_p |= remove_subreg_range (bb_info, def);
+ problem_data->has_subreg_live_p
+ |= add_subreg_range (bb_info, def, true);
+ }
+
+ FOR_EACH_INSN_INFO_USE (use, insn_info)
+ {
+ unsigned int regno = DF_REF_REGNO (use);
+ machine_mode mode = GET_MODE (DF_REF_REAL_REG (use));
+ /* Ignore the use of SET_DEST which is (subreg (reg) offset). */
+ if (need_track_subreg (regno, mode)
+ && DF_REF_FLAGS (use) & (DF_REF_READ_WRITE | DF_REF_SUBREG))
+ continue;
+ problem_data->has_subreg_live_p |= add_subreg_range (bb_info, use);
+ }
+ }
+
+ /* Process the registers set in an exception handler or the hard
+ frame pointer if this block is the target of a non local
+ goto. */
+ FOR_EACH_ARTIFICIAL_DEF (def, bb_index)
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ {
+ problem_data->has_subreg_live_p
+ |= add_subreg_range (bb_info, def, true);
+ problem_data->has_subreg_live_p |= remove_subreg_range (bb_info, def);
+ }
+
+#ifdef EH_USES
+ /* Process the uses that are live into an exception handler. */
+ FOR_EACH_ARTIFICIAL_USE (use, bb_index)
+ /* Add use to set of uses in this BB. */
+ if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
+ problem_data->has_subreg_live_p |= add_subreg_range (bb_info, use);
+#endif
+}
+
+/* Compute local live register info for each basic block within BLOCKS. */
+
+static void
+df_live_subreg_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
+{
+ unsigned int bb_index, i;
+ bitmap_iterator bi;
+
+ bitmap_clear (&df->hardware_regs_used);
+
+ /* The all-important stack pointer must always be live. */
+ bitmap_set_bit (&df->hardware_regs_used, STACK_POINTER_REGNUM);
+
+ /* Global regs are always live, too. */
+ for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+ if (global_regs[i])
+ bitmap_set_bit (&df->hardware_regs_used, i);
+
+ /* Before reload, there are a few registers that must be forced
+ live everywhere -- which might not already be the case for
+ blocks within infinite loops. */
+ if (!reload_completed)
+ {
+ unsigned int pic_offset_table_regnum = PIC_OFFSET_TABLE_REGNUM;
+ /* Any reference to any pseudo before reload is a potential
+ reference of the frame pointer. */
+ bitmap_set_bit (&df->hardware_regs_used, FRAME_POINTER_REGNUM);
+
+ /* Pseudos with argument area equivalences may require
+ reloading via the argument pointer. */
+ if (FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
+ && fixed_regs[ARG_POINTER_REGNUM])
+ bitmap_set_bit (&df->hardware_regs_used, ARG_POINTER_REGNUM);
+
+ /* Any constant, or pseudo with constant equivalences, may
+ require reloading from memory using the pic register. */
+ if (pic_offset_table_regnum != INVALID_REGNUM
+ && fixed_regs[pic_offset_table_regnum])
+ bitmap_set_bit (&df->hardware_regs_used, pic_offset_table_regnum);
+ }
+
+ EXECUTE_IF_SET_IN_BITMAP (df_live_subreg->out_of_date_transfer_functions, 0,
+ bb_index, bi)
+ {
+ if (bb_index == EXIT_BLOCK)
+ {
+ /* The exit block is special for this problem and its bits are
+ computed from thin air. */
+ class df_live_subreg_bb_info *bb_info
+ = df_live_subreg_get_bb_info (EXIT_BLOCK);
+ bitmap_copy (&bb_info->full_use, df->exit_block_uses);
+ }
+ else
+ df_live_subreg_bb_local_compute (bb_index);
+ }
+
+ bitmap_clear (df_live_subreg->out_of_date_transfer_functions);
+}
+
+/* Initialize the solution vectors. */
+
+static void
+df_live_subreg_init (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ df_live_subreg_bb_info *bb_info = df_live_subreg_get_bb_info (bb_index);
+ bitmap_copy (&bb_info->full_in, &bb_info->full_use);
+ bitmap_copy (&bb_info->partial_in, &bb_info->partial_use);
+ bb_info->range_in->copy_lives (*bb_info->range_use);
+ bitmap_clear (&bb_info->full_out);
+ bitmap_clear (&bb_info->partial_out);
+ bb_info->range_out->clear ();
+ }
+}
+
+/* Check the result is golden. */
+static void
+df_live_subreg_check_result (bitmap full, bitmap partial,
+ subregs_live *partial_live)
+{
+ unsigned int regno;
+ bitmap_iterator bi;
+ gcc_assert (!bitmap_intersect_p (full, partial));
+ EXECUTE_IF_SET_IN_BITMAP (full, 0, regno, bi)
+ gcc_assert (partial_live->empty_p (regno));
+ EXECUTE_IF_SET_IN_BITMAP (partial, 0, regno, bi)
+ gcc_assert (!partial_live->empty_p (regno));
+}
+
+/* Confluence function that processes infinite loops. This might be a
+ noreturn function that throws. And even if it isn't, getting the
+ unwind info right helps debugging. */
+static void
+df_live_subreg_confluence_0 (basic_block bb)
+{
+ bitmap full_out = &df_live_subreg_get_bb_info (bb->index)->full_out;
+ if (bb != EXIT_BLOCK_PTR_FOR_FN (cfun))
+ bitmap_copy (full_out, &df->hardware_regs_used);
+}
+
+/* Confluence function that ignores fake edges. */
+
+static bool
+df_live_subreg_confluence_n (edge e)
+{
+ df_live_subreg_problem_data *problem_data
+ = (df_live_subreg_problem_data *) df_live_subreg->problem_data;
+ class df_live_subreg_bb_info *src_bb_info
+ = df_live_subreg_get_bb_info (e->src->index);
+ class df_live_subreg_bb_info *dest_bb_info
+ = df_live_subreg_get_bb_info (e->dest->index);
+
+ if (!problem_data->has_subreg_live_p)
+ {
+ bool changed = false;
+
+ /* Call-clobbered registers die across exception and call edges.
+ Conservatively treat partially-clobbered registers as surviving
+ across the edges; they might or might not, depending on what
+ mode they have. */
+ /* ??? Abnormal call edges ignored for the moment, as this gets
+ confused by sibling call edges, which crashes reg-stack. */
+ if (e->flags & EDGE_EH)
+ {
+ bitmap_view<HARD_REG_SET> eh_kills (eh_edge_abi.full_reg_clobbers ());
+ changed
+ = bitmap_ior_and_compl_into (&src_bb_info->full_out,
+ &dest_bb_info->full_in, eh_kills);
+ }
+ else
+ changed
+ = bitmap_ior_into (&src_bb_info->full_out, &dest_bb_info->full_in);
+
+ changed
+ |= bitmap_ior_into (&src_bb_info->full_out, &df->hardware_regs_used);
+ return changed;
+ }
+
+ /* If there has subreg live need be tracked. Calculation formula:
+ temp_full mean:
+ 1. partial in out/in, full in other in/out
+ 2. partial in out and in, and mrege range is full
+ temp_range mean:
+ the range of regno which partial live
+ src_bb_info->partial_out = (src_bb_info->partial_out |
+ dest_bb_info->partial_in) & ~temp_full
+ src_bb_info->range_out = copy(temp_range)
+ src_bb_info->full_out |= dest_bb_info->full_in | temp_full
+ */
+ subregs_live temp_range;
+ temp_range.add_lives (*src_bb_info->range_out);
+ temp_range.add_lives (*dest_bb_info->range_in);
+
+ bitmap_head temp_partial_all;
+ bitmap_initialize (&temp_partial_all, &bitmap_default_obstack);
+ bitmap_ior (&temp_partial_all, &src_bb_info->partial_out,
+ &dest_bb_info->partial_in);
+
+ bitmap_head temp_full;
+ bitmap_initialize (&temp_full, &bitmap_default_obstack);
+
+ /* Collect regno that become full after merge src_bb_info->partial_out
+ and dest_bb_info->partial_in. */
+ unsigned int regno;
+ bitmap_iterator bi;
+ EXECUTE_IF_SET_IN_BITMAP (&temp_partial_all, FIRST_PSEUDO_REGISTER, regno,
bi)
+ {
+ if (bitmap_bit_p (&src_bb_info->full_out, regno)
+ || bitmap_bit_p (&dest_bb_info->full_in, regno))
+ {
+ bitmap_set_bit (&temp_full, regno);
+ temp_range.remove_live (regno);
+ continue;
+ }
+ else if (!bitmap_bit_p (&src_bb_info->partial_out, regno)
+ || !bitmap_bit_p (&dest_bb_info->partial_in, regno))
+ continue;
+
+ subreg_ranges temp = src_bb_info->range_out->lives.at (regno);
+ temp.add_ranges (dest_bb_info->range_in->lives.at (regno));
+ if (temp.full_p ())
+ {
+ bitmap_set_bit (&temp_full, regno);
+ temp_range.remove_live (regno);
+ }
+ }
+
+ /* Calculating src_bb_info->partial_out and src_bb_info->range_out. */
+ bool changed = bitmap_and_compl (&src_bb_info->partial_out,
&temp_partial_all,
+ &temp_full);
+ changed |= src_bb_info->range_out->copy_lives (temp_range);
+
+ /* Calculating src_bb_info->full_out. */
+ bitmap_ior_into (&temp_full, &dest_bb_info->full_in);
+
+ /* Call-clobbered registers die across exception and call edges.
+ Conservatively treat partially-clobbered registers as surviving
+ across the edges; they might or might not, depending on what
+ mode they have. */
+ /* ??? Abnormal call edges ignored for the moment, as this gets
+ confused by sibling call edges, which crashes reg-stack. */
+ if (e->flags & EDGE_EH)
+ {
+ bitmap_view<HARD_REG_SET> eh_kills (eh_edge_abi.full_reg_clobbers ());
+ changed |= bitmap_ior_and_compl_into (&src_bb_info->full_out, &temp_full,
+ eh_kills);
+ }
+ else
+ changed |= bitmap_ior_into (&src_bb_info->full_out, &temp_full);
+
+ changed |= bitmap_ior_into (&src_bb_info->full_out, &df->hardware_regs_used);
+
+ bitmap_clear (&temp_full);
+ bitmap_clear (&temp_partial_all);
+
+ df_live_subreg_check_result (&src_bb_info->full_out,
+ &src_bb_info->partial_out,
+ src_bb_info->range_out);
+ return changed;
+}
+
+/* Transfer function. */
+
+static bool
+df_live_subreg_transfer_function (int bb_index)
+{
+ class df_live_subreg_bb_info *bb_info = df_live_subreg_get_bb_info
(bb_index);
+ df_live_subreg_problem_data *problem_data
+ = (df_live_subreg_problem_data *) df_live_subreg->problem_data;
+ if (!problem_data->has_subreg_live_p)
+ {
+ bitmap in = &bb_info->full_in;
+ bitmap out = &bb_info->full_out;
+ bitmap use = &bb_info->full_use;
+ bitmap def = &bb_info->full_def;
+
+ return bitmap_ior_and_compl (in, use, out, def);
+ }
+
+ /* If there has subreg live need be tracked, follow the bellow calculation
+ formula:
+ all_def = full_def | partial_def
+ temp_partial_out = ((full_out & partail_def)
+ | (partail_out & ~all_def)
+ | (partial_out remove partail_def not empty))
+ & ~full_use
+ temp_partial_be_full = (temp_partial_out & partial_use) merge be full
+ full_in = full_use | full_out & ~all_def | temp_partial_be_full
+ partail_in = (temp_partial_out | partial_use) & ~temp_partial_be_full
*/
+ unsigned int regno;
+ bitmap_iterator bi;
+ bool changed = false;
+ bitmap_head temp_partial_out;
+ bitmap_head temp_partial_be_full;
+ bitmap_head all_def;
+ subregs_live temp_range_out;
+ bitmap_initialize (&temp_partial_out, &bitmap_default_obstack);
+ bitmap_initialize (&temp_partial_be_full, &bitmap_default_obstack);
+ bitmap_initialize (&all_def, &bitmap_default_obstack);
+
+ bitmap_ior (&all_def, &bb_info->full_def, &bb_info->partial_def);
+
+ /* temp_partial_out = (full_out & partail_def) */
+ bitmap_and (&temp_partial_out, &bb_info->full_out, &bb_info->partial_def);
+ EXECUTE_IF_SET_IN_BITMAP (&temp_partial_out, FIRST_PSEUDO_REGISTER, regno,
bi)
+ {
+ subreg_ranges temp (bb_info->range_def->lives.at (regno).max);
+ temp.make_full ();
+ temp.remove_ranges (bb_info->range_def->lives.at (regno));
+ temp_range_out.add_ranges (regno, temp);
+ }
+
+ /* temp_partial_out |= (partail_out & ~all_def) */
+ bitmap_ior_and_compl_into (&temp_partial_out, &bb_info->partial_out,
+ &all_def);
+ EXECUTE_IF_AND_COMPL_IN_BITMAP (&bb_info->partial_out, &all_def,
+ FIRST_PSEUDO_REGISTER, regno, bi)
+ {
+ temp_range_out.add_ranges (regno, bb_info->range_out->lives.at (regno));
+ }
+
+ /* temp_partial_out |= (partial_out remove partail_def not empty) */
+ EXECUTE_IF_AND_IN_BITMAP (&bb_info->partial_out, &bb_info->partial_def, 0,
+ regno, bi)
+ {
+ subreg_ranges temp = bb_info->range_out->lives.at (regno);
+ temp.remove_ranges (bb_info->range_def->lives.at (regno));
+ if (!temp.empty_p ())
+ {
+ bitmap_set_bit (&temp_partial_out, regno);
+ temp_range_out.add_ranges (regno, temp);
+ }
+ }
+
+ /* temp_partial_out = temp_partial_out & ~full_use */
+ bitmap_and_compl_into (&temp_partial_out, &bb_info->full_use);
+ EXECUTE_IF_SET_IN_BITMAP (&bb_info->full_use, 0, regno, bi)
+ if (!temp_range_out.empty_p (regno))
+ temp_range_out.remove_live (regno);
+
+ /* temp_partial_be_full = (temp_partial_out & partial_use) merge become full
+ */
+ temp_range_out.add_lives (*bb_info->range_use);
+ /* Remove all range which in partial_use and in full_out and not in all_def.
+ */
+ EXECUTE_IF_SET_IN_BITMAP (&bb_info->full_out, 0, regno, bi)
+ if (!bitmap_bit_p (&all_def, regno) && !temp_range_out.empty_p (regno))
+ temp_range_out.remove_live (regno);
+
+ EXECUTE_IF_AND_IN_BITMAP (&temp_partial_out, &bb_info->partial_use, 0, regno,
+ bi)
+ {
+ subreg_ranges temp = temp_range_out.lives.at (regno);
+ temp.add_ranges (bb_info->range_use->lives.at (regno));
+ if (temp.full_p ())
+ {
+ bitmap_set_bit (&temp_partial_be_full, regno);
+ temp_range_out.remove_live (regno);
+ }
+ }
+
+ /* Calculating full_in. */
+ bitmap_ior_and_compl_into (&temp_partial_be_full, &bb_info->full_out,
+ &all_def);
+ changed |= bitmap_ior (&bb_info->full_in, &temp_partial_be_full,
+ &bb_info->full_use);
+
+ /* Calculating partial_in and range_in. */
+ bitmap_ior_into (&temp_partial_out, &bb_info->partial_use);
+ changed |= bitmap_and_compl (&bb_info->partial_in, &temp_partial_out,
+ &temp_partial_be_full);
+ changed |= bb_info->range_in->copy_lives (temp_range_out);
+
+ bitmap_clear (&temp_partial_out);
+ bitmap_clear (&temp_partial_be_full);
+ bitmap_clear (&all_def);
+
+ df_live_subreg_check_result (&bb_info->full_in, &bb_info->partial_in,
+ bb_info->range_in);
+
+ return changed;
+}
+
+/* Run the fast dce as a side effect of building LR. */
+
+void
+df_live_subreg_finalize (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ class df_live_subreg_bb_info *bb_info
+ = df_live_subreg_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_ior (&bb_info->all_in, &bb_info->full_in, &bb_info->partial_in);
+ bitmap_ior (&bb_info->all_out, &bb_info->full_out,
&bb_info->partial_out);
+ }
+}
+
+/* Free all storage associated with the problem. */
+
+static void
+df_live_subreg_free (void)
+{
+ df_live_subreg_problem_data *problem_data
+ = (df_live_subreg_problem_data *) df_live_subreg->problem_data;
+ if (df_live_subreg->block_info)
+ {
+ df_live_subreg->block_info_size = 0;
+ free (df_live_subreg->block_info);
+ df_live_subreg->block_info = NULL;
+ bitmap_obstack_release (&problem_data->live_subreg_bitmaps);
+ free (df_live_subreg->problem_data);
+ df_live_subreg->problem_data = NULL;
+ }
+
+ BITMAP_FREE (df_live_subreg->out_of_date_transfer_functions);
+ free (df_live_subreg);
+}
+
+/* Debugging info at top of bb. */
+
+static void
+df_live_subreg_top_dump (basic_block bb, FILE *file)
+{
+ df_live_subreg_bb_info *bb_info = df_live_subreg_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; subreg live all in \t");
+ df_print_regset (file, &bb_info->all_in);
+ fprintf (file, ";; subreg live full in \t");
+ df_print_regset (file, &bb_info->full_in);
+ fprintf (file, ";; subreg live partial in \t");
+ df_print_regset (file, &bb_info->partial_in);
+ fprintf (file, ";; subreg live range in \t");
+ bb_info->range_in->dump (file, "");
+
+ fprintf (file, "\n;; subreg live full use \t");
+ df_print_regset (file, &bb_info->full_use);
+ fprintf (file, ";; subreg live partial use \t");
+ df_print_regset (file, &bb_info->partial_use);
+ fprintf (file, ";; subreg live range use \t");
+ bb_info->range_use->dump (file, "");
+
+ fprintf (file, "\n;; subreg live full def \t");
+ df_print_regset (file, &bb_info->full_def);
+ fprintf (file, ";; subreg live partial def \t");
+ df_print_regset (file, &bb_info->partial_def);
+ fprintf (file, ";; subreg live range def \t");
+ bb_info->range_def->dump (file, "");
+}
+
+/* Debugging info at bottom of bb. */
+
+static void
+df_live_subreg_bottom_dump (basic_block bb, FILE *file)
+{
+ df_live_subreg_bb_info *bb_info = df_live_subreg_get_bb_info (bb->index);
+ if (!bb_info)
+ return;
+
+ fprintf (file, ";; subreg live all out \t");
+ df_print_regset (file, &bb_info->all_out);
+ fprintf (file, ";; subreg live full out \t");
+ df_print_regset (file, &bb_info->full_out);
+ fprintf (file, ";; subreg live partial out \t");
+ df_print_regset (file, &bb_info->partial_out);
+ fprintf (file, ";; subreg live range out \t");
+ bb_info->range_out->dump (file, "");
+}
+
+/* All of the information associated with every instance of the problem. */
+
+static const struct df_problem problem_LIVE_SUBREG = {
+ DF_LIVE_SUBREG, /* Problem id. */
+ DF_BACKWARD, /* Direction. */
+ df_live_subreg_alloc, /* Allocate the problem specific
data. */
+ df_live_subreg_reset, /* Reset global information. */
+ df_live_subreg_free_bb_info, /* Free basic block info. */
+ df_live_subreg_local_compute, /* Local compute function. */
+ df_live_subreg_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ df_live_subreg_confluence_0, /* Confluence operator 0. */
+ df_live_subreg_confluence_n, /* Confluence operator n. */
+ df_live_subreg_transfer_function, /* Transfer function. */
+ df_live_subreg_finalize, /* Finalize function. */
+ df_live_subreg_free, /* Free all of the problem information. */
+ df_live_subreg_free, /* Remove this problem from the stack of dataflow
+ problems. */
+ NULL, /* Debugging. */
+ df_live_subreg_top_dump, /* Debugging start block. */
+ df_live_subreg_bottom_dump, /* Debugging end block. */
+ NULL, /* Debugging start insn. */
+ NULL, /* Debugging end insn. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ &problem_LR, /* Dependent problem. */
+ sizeof (df_live_subreg_bb_info), /* Size of entry of block_info array. */
+ TV_DF_LIVE_SUBREG, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
+};
+
+/* Create a new DATAFLOW instance and add it to an existing instance
+ of DF. The returned structure is what is used to get at the
+ solution. */
+
+void
+df_live_subreg_add_problem (void)
+{
+ df_add_problem (&problem_LIVE_SUBREG);
+
+ /* These will be initialized when df_scan_blocks processes each
+ block. */
+ df_live_subreg->out_of_date_transfer_functions
+ = BITMAP_ALLOC (&df_bitmap_obstack);
+}
-
/*----------------------------------------------------------------------------
LIVE AND MAY-INITIALIZED REGISTERS.
diff --git a/gcc/df.h b/gcc/df.h
index 402657a7076..50a6cf99863 100644
--- a/gcc/df.h
+++ b/gcc/df.h
@@ -47,6 +47,7 @@ enum df_problem_id
{
DF_SCAN,
DF_LR, /* Live Registers backward. */
+ DF_LIVE_SUBREG, /* Live Ranges and Live Subreg */
DF_LIVE, /* Live Registers & Uninitialized Registers */
DF_RD, /* Reaching Defs. */
DF_CHAIN, /* Def-Use and/or Use-Def Chains. */
@@ -619,6 +620,7 @@ public:
#define DF_SCAN_BB_INFO(BB) (df_scan_get_bb_info ((BB)->index))
#define DF_RD_BB_INFO(BB) (df_rd_get_bb_info ((BB)->index))
#define DF_LR_BB_INFO(BB) (df_lr_get_bb_info ((BB)->index))
+#define DF_LIVE_SUBREG_INFO(BB) (df_live_subreg_get_bb_info ((BB)->index))
#define DF_LIVE_BB_INFO(BB) (df_live_get_bb_info ((BB)->index))
#define DF_WORD_LR_BB_INFO(BB) (df_word_lr_get_bb_info ((BB)->index))
#define DF_MD_BB_INFO(BB) (df_md_get_bb_info ((BB)->index))
@@ -632,6 +634,15 @@ public:
#define DF_MIR_IN(BB) (&DF_MIR_BB_INFO (BB)->in)
#define DF_MIR_OUT(BB) (&DF_MIR_BB_INFO (BB)->out)
+#define DF_LIVE_SUBREG_IN(BB) (&DF_LIVE_SUBREG_INFO (BB)->all_in)
+#define DF_LIVE_SUBREG_OUT(BB) (&DF_LIVE_SUBREG_INFO (BB)->all_out)
+#define DF_LIVE_SUBREG_FULL_IN(BB) (&DF_LIVE_SUBREG_INFO (BB)->full_in)
+#define DF_LIVE_SUBREG_FULL_OUT(BB) (&DF_LIVE_SUBREG_INFO (BB)->full_out)
+#define DF_LIVE_SUBREG_PARTIAL_IN(BB) (&DF_LIVE_SUBREG_INFO (BB)->partial_in)
+#define DF_LIVE_SUBREG_PARTIAL_OUT(BB) (&DF_LIVE_SUBREG_INFO (BB)->partial_out)
+#define DF_LIVE_SUBREG_RANGE_IN(BB) (DF_LIVE_SUBREG_INFO (BB)->range_in)
+#define DF_LIVE_SUBREG_RANGE_OUT(BB) (DF_LIVE_SUBREG_INFO (BB)->range_out)
+
/* These macros are used by passes that are not tolerant of
uninitialized variables. This intolerance should eventually
be fixed. */
@@ -878,6 +889,32 @@ public:
bitmap_head out; /* At the bottom of the block. */
};
+class subregs_live;
+
+class basic_block_subreg_live_info
+{
+public:
+ bitmap_head full_def;
+ bitmap_head full_use;
+ /* Only for pseudo registers. */
+ bitmap_head partial_def;
+ bitmap_head partial_use;
+ subregs_live *range_def = NULL;
+ subregs_live *range_use = NULL;
+};
+
+/* Live registers and live ranges including specifial subreg. */
+class df_live_subreg_bb_info : public basic_block_subreg_live_info
+{
+public:
+ bitmap_head all_in, full_in;
+ bitmap_head all_out, full_out;
+ /* Only for pseudo registers. */
+ bitmap_head partial_in;
+ bitmap_head partial_out;
+ subregs_live *range_in = NULL;
+ subregs_live *range_out = NULL;
+};
/* Uninitialized registers. All bitmaps are referenced by the
register number. Anded results of the forwards and backward live
@@ -946,6 +983,7 @@ extern class df_d *df;
#define df_note (df->problems_by_index[DF_NOTE])
#define df_md (df->problems_by_index[DF_MD])
#define df_mir (df->problems_by_index[DF_MIR])
+#define df_live_subreg (df->problems_by_index[DF_LIVE_SUBREG])
/* This symbol turns on checking that each modification of the cfg has
been identified to the appropriate df routines. It is not part of
@@ -1031,6 +1069,25 @@ extern void df_lr_add_problem (void);
extern void df_lr_verify_transfer_functions (void);
extern void df_live_verify_transfer_functions (void);
extern void df_live_add_problem (void);
+extern void
+df_live_subreg_add_problem (void);
+extern void
+df_live_subreg_finalize (bitmap all_blocks);
+class subreg_range;
+extern bool
+need_track_subreg (int regno, machine_mode mode);
+extern void
+remove_subreg_range (basic_block_subreg_live_info *bb_info, unsigned int regno,
+ machine_mode mode, const subreg_range &range);
+extern bool
+remove_subreg_range (basic_block_subreg_live_info *bb_info, df_ref ref);
+extern void
+add_subreg_range (basic_block_subreg_live_info *bb_info, unsigned int regno,
+ machine_mode mode, const subreg_range &range,
+ bool is_def = false);
+extern bool
+add_subreg_range (basic_block_subreg_live_info *bb_info, df_ref ref,
+ bool is_def = false);
extern void df_live_set_all_dirty (void);
extern void df_chain_add_problem (unsigned int);
extern void df_word_lr_add_problem (void);
@@ -1124,6 +1181,16 @@ df_lr_get_bb_info (unsigned int index)
return NULL;
}
+inline class df_live_subreg_bb_info *
+df_live_subreg_get_bb_info (unsigned int index)
+{
+ if (index < df_live_subreg->block_info_size)
+ return &(
+ (class df_live_subreg_bb_info *) df_live_subreg->block_info)[index];
+ else
+ return NULL;
+}
+
inline class df_md_bb_info *
df_md_get_bb_info (unsigned int index)
{
diff --git a/gcc/regs.h b/gcc/regs.h
index aea093ed795..84c6bdb980c 100644
--- a/gcc/regs.h
+++ b/gcc/regs.h
@@ -389,4 +389,11 @@ range_in_hard_reg_set_p (const_hard_reg_set set, unsigned
regno, int nregs)
return true;
}
+/* Return the number of blocks the MODE overlap. One block equal mode's natural
+ size. So, satisfy the following equation:
+ (nblocks - 1) * natural_size < GET_MODE_SIZE (mode)
+ <= nblocks * natural_size. */
+#define get_nblocks(mode)
\
+ (exact_div (GET_MODE_SIZE (mode), REGMODE_NATURAL_SIZE (mode)).to_constant
())
+
#endif /* GCC_REGS_H */
diff --git a/gcc/subreg-live-range.cc b/gcc/subreg-live-range.cc
new file mode 100644
index 00000000000..43a5eafedf1
--- /dev/null
+++ b/gcc/subreg-live-range.cc
@@ -0,0 +1,628 @@
+/* SUBREG live range track classes for DF & IRA & LRA.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+ Contributed by Lehua Ding (lehua.d...@rivai.ai), RiVAI Technologies Ltd.
+
+ 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/>. */
+
+#include "subreg-live-range.h"
+#include "selftest.h"
+#include "print-rtl.h"
+
+/* class subreg_range */
+void
+subreg_range::dump (FILE *file) const
+{
+ fprintf (file, "[%d, %d)", start, end);
+}
+
+/* class subreg_ranges */
+bool
+subreg_ranges::add_range (int max, const subreg_range &new_range)
+{
+ subreg_range range = new_range;
+ if (full_p ())
+ return false;
+ else if (max == 1)
+ {
+ gcc_assert (range.start == 0 && range.end == 1);
+ make_full ();
+ return true;
+ }
+
+ if (this->max == 1)
+ change_max (max);
+
+ gcc_assert (this->max == max);
+ gcc_assert (range.start < range.end);
+
+ bool changed = empty_p ();
+ auto it = ranges.begin ();
+ while (it != ranges.end ())
+ {
+ const subreg_range &r = *it;
+ gcc_assert (r.start < r.end);
+
+ /* The possible positional relationship of R and RANGE.
+ 1~5 means R.start's possible position relative to RANGE
+ A~G means R.end's possible position relative to RANGE
+ caseN means when R.start at N positon, the R.end can be in which
+ positions.
+
+ RANGE.start RANGE.end
+ [ )
+ | |
+ R.start 1 2 3 4 5
+ R.end | |
+ case1 A B C D E
+ case2 | C D E
+ case3 | F D E
+ case4 | | E
+ case5 | | G
+
+ */
+
+ /* R.start at 1 position. */
+ if (r.start < range.start)
+ {
+ /* R.end at A position. That means R and RANGE do not overlap. */
+ if (r.end < range.start)
+ it++;
+ /* R.end at B/C position. That means RANGE's left part overlap R's
+ right part. Expand RANGE.start to R.start and remove R. */
+ else if (r.end < range.end)
+ {
+ changed = true;
+ range.start = r.start;
+ it = ranges.erase (it);
+ }
+ /* R.end at D/E position. That means R already contains RANGE, nothing
+ todo. */
+ else
+ return false;
+ }
+ /* R.start at 2 position. */
+ else if (r.start == range.start)
+ {
+ /* R.end at C/D position. That means RANGE contains R, remove R and
+ insert RANGE. */
+ if (r.end < range.end)
+ {
+ changed = true;
+ it = ranges.erase (it);
+ }
+ /* R.end at E position. That means R already contains RANGE, nothing
+ todo. */
+ else
+ return false;
+ }
+ /* R.start at 3 position. */
+ else if (r.start > range.start && r.start < range.end)
+ {
+ /* R.end at F/D position. That means RANGE contains R, just remove R
+ and insert RANGE later. */
+ if (r.end <= range.end)
+ {
+ changed = true;
+ it = ranges.erase (it);
+ }
+ /* R.end at E position. That means RANGE's right part overlap R's
+ left part. Expand RANGE.end to R.end and remove R. */
+ else if (r.end > range.end)
+ {
+ changed = true;
+ range.end = r.end;
+ it = ranges.erase (it);
+ break;
+ }
+ }
+ /* R.start at 4 position and R.end at E position. That means RANGE and R
+ are adjacent and can be merged. */
+ else if (r.start == range.end)
+ {
+ changed = true;
+ range.end = r.end;
+ it = ranges.erase (it);
+ }
+ /* R.start at 5 position and R.end at G position. That means R and RANGE
+ do not overlap. */
+ else
+ break;
+ }
+ ranges.insert (range);
+ return changed;
+}
+
+bool
+subreg_ranges::remove_range (int max, const subreg_range &range)
+{
+ if (empty_p ())
+ return false;
+ else if (max == 1)
+ {
+ gcc_assert (range.start == 0 && range.end == 1);
+ make_empty ();
+ return true;
+ }
+
+ if (this->max == 1)
+ {
+ gcc_assert (full_p ());
+ change_max (max);
+ }
+ gcc_assert (this->max == max);
+ gcc_assert (range.start < range.end);
+
+ bool changed = false;
+ auto it = ranges.begin ();
+ std::set<subreg_range> new_ranges;
+ while (it != ranges.end ())
+ {
+ auto &r = *it;
+ gcc_assert (r.start < r.end);
+
+ /* The possible positional relationship of R and RANGE.
+ 1~5 means R.start's possible position relative to RANGE
+ A~G means R.end's possible position relative to RANGE
+ caseN means when R.start at N positon, the R.end can be in which
+ positions.
+
+ RANGE.start RANGE.end
+ [ )
+ | |
+ R.start 1 2 3 4 5
+ R.end | |
+ case1 A B C D E
+ case2 | C D E
+ case3 | F D E
+ case4 | | E
+ case5 | | G
+
+ */
+
+ /* R.start at 1 position. */
+ if (r.start < range.start)
+ {
+ /* R.end at A/B position. That means RANGE and R do not overlap,
+ nothing to remove. */
+ if (r.end <= range.start)
+ it++;
+ /* R.end at C/D position. That means R's rigth part contains RANGE,
+ need shrink R.end to RANGE.start. */
+ else if (r.end <= range.end)
+ {
+ changed = true;
+ new_ranges.insert (subreg_range (r.start, range.start));
+ it = ranges.erase (it);
+ }
+ /* R.end at E position. That means R's center part contains RANGE,
+ need split R to two range, one range is [R.start, RANGE.start),
+ another range is [RANGE.end, R.end). */
+ else
+ {
+ changed = true;
+ new_ranges.insert (subreg_range (r.start, range.start));
+ new_ranges.insert (subreg_range (range.end, r.end));
+ it = ranges.erase (it);
+ break;
+ }
+ }
+ /* R.start at 2 position. */
+ else if (r.start == range.start)
+ {
+ /* R.end at C/D position. That means RANGE contains R, remove R. */
+ if (r.end <= range.end)
+ {
+ changed = true;
+ it = ranges.erase (it);
+ }
+ /* R.end at E position. That means R's left part contains RANGE,
+ shrink R.start to RANGE.end. */
+ else
+ {
+ changed = true;
+ new_ranges.insert (subreg_range (range.end, r.end));
+ it = ranges.erase (it);
+ break;
+ }
+ }
+ /* R.start at 3 position. */
+ else if (r.start > range.start && r.start < range.end)
+ {
+ /* R.end at F/D position. That means RANGE contains R, remove R. */
+ if (r.end <= range.end)
+ {
+ changed = true;
+ it = ranges.erase (it);
+ }
+ /* R.end at E position. That means RANGE's right part overlap R's left
+ part, shrink R.start to RANGE.end. */
+ else
+ {
+ changed = true;
+ new_ranges.insert (subreg_range (range.end, r.end));
+ it = ranges.erase (it);
+ break;
+ }
+ }
+ /* R.start at 4/5 position. That means RANGE and R do not overlap. */
+ else
+ break;
+ }
+ for (auto &r : new_ranges)
+ add_range (this->max, r);
+ return changed;
+}
+
+bool
+subreg_ranges::add_ranges (const subreg_ranges &sr)
+{
+ gcc_assert (max == sr.max || max == 1 || sr.max == 1);
+
+ if (full_p () || sr.empty_p ())
+ return false;
+ else if (sr.full_p ())
+ {
+ make_full ();
+ return true;
+ }
+
+ bool changed = false;
+ for (auto &r : sr.ranges)
+ changed |= add_range (sr.max, r);
+ return changed;
+}
+
+bool
+subreg_ranges::remove_ranges (const subreg_ranges &sr)
+{
+ if (empty_p () || sr.empty_p ())
+ return false;
+ else if (sr.full_p ())
+ {
+ make_empty ();
+ return true;
+ }
+
+ gcc_assert (max == sr.max || max == 1 || sr.max == 1);
+
+ bool changed = false;
+ for (auto &r : sr.ranges)
+ changed |= remove_range (sr.max, r);
+ return changed;
+}
+
+bool
+subreg_ranges::same_p (const subreg_ranges &sr) const
+{
+ if (max == 1 || sr.max == 1)
+ return (empty_p () && sr.empty_p ()) || (full_p () && sr.full_p ());
+ else if (max == sr.max)
+ {
+ if (ranges.size () != sr.ranges.size ())
+ return false;
+ /* Make sure that the elements in each position are the same. */
+ auto it1 = ranges.begin ();
+ auto it2 = sr.ranges.begin ();
+ while (it1 != ranges.end ())
+ {
+ const subreg_range &r1 = *it1;
+ const subreg_range &r2 = *it2;
+ if (r1.start != r2.start || r1.end != r2.end)
+ return false;
+ it1++;
+ it2++;
+ }
+ return true;
+ }
+ else
+ gcc_unreachable ();
+}
+
+bool
+subreg_ranges::include_ranges_p (const subreg_ranges &sr) const
+{
+ gcc_assert (max == sr.max || max == 1 || sr.max == 1);
+ if (full_p ())
+ return true;
+ if (empty_p () && sr.empty_p ())
+ return true;
+ if (same_p (sr))
+ return true;
+
+ for (const auto &r : sr.ranges)
+ if (!include_range_p (sr.max, r))
+ return false;
+ return true;
+}
+
+bool
+subreg_ranges::include_range_p (int max, const subreg_range &range) const
+{
+ gcc_assert (this->max == max);
+ for (const auto &r : ranges)
+ {
+ if (r.start <= range.start && r.end >= range.end)
+ return true;
+ else if (r.start >= range.end)
+ return false;
+ }
+ return false;
+}
+
+void
+subreg_ranges::dump (FILE *file) const
+{
+ if (empty_p ())
+ {
+ fprintf (file, "empty");
+ return;
+ }
+ else if (full_p ())
+ {
+ fprintf (file, "full");
+ return;
+ }
+
+ fprintf (file, "patial(max:%d", max);
+ fprintf (file, " {");
+ for (auto &range : ranges)
+ {
+ fprintf (file, " ");
+ range.dump (file);
+ }
+ fprintf (file, " })");
+}
+
+/* class subregs_live */
+bool
+subregs_live::copy_lives (const subregs_live &sl)
+{
+ bool changed = false;
+ subregs_live temp;
+ for (auto &kv : sl.lives)
+ {
+ unsigned int regno = kv.first;
+ const subreg_ranges &sr = kv.second;
+ if (lives.count (regno) == 0 && !sr.empty_p ())
+ {
+ changed = true;
+ temp.add_ranges (regno, sr);
+ }
+ else if (lives.count (regno) != 0)
+ {
+ changed |= !lives.at (regno).same_p (sr);
+ temp.add_ranges (regno, sr);
+ }
+ }
+
+ for (auto &kv : lives)
+ {
+ unsigned int regno = kv.first;
+ subreg_ranges &sr = kv.second;
+ if (temp.lives.count (regno) == 0 && !sr.empty_p ())
+ changed = true;
+ }
+ lives = temp.lives;
+ return changed;
+}
+
+bool
+subregs_live::add_lives (const subregs_live &sl)
+{
+ bool changed = false;
+ for (auto &kv : sl.lives)
+ {
+ unsigned int regno = kv.first;
+ const subreg_ranges &sr = kv.second;
+ if (sr.empty_p ())
+ continue;
+
+ if (lives.count (regno) == 0)
+ {
+ changed = true;
+ lives.insert ({regno, sr});
+ }
+ else
+ changed |= lives.at (regno).add_ranges (sr);
+ }
+ return changed;
+}
+
+bool
+subregs_live::remove_lives (const subregs_live &sl)
+{
+ bool changed = false;
+ for (auto &kv : sl.lives)
+ {
+ unsigned int regno = kv.first;
+ const subreg_ranges &sr = kv.second;
+ if (sr.empty_p ())
+ continue;
+
+ if (lives.count (regno) != 0)
+ {
+ changed |= lives.at (regno).remove_ranges (sr);
+ if (lives.at (regno).empty_p ())
+ lives.erase (regno);
+ }
+ }
+ return changed;
+}
+
+void
+subregs_live::dump (FILE *file, const char *indent) const
+{
+ if (lives.empty ())
+ {
+ fprintf (file, "%sempty\n", indent);
+ return;
+ }
+ fprintf (file, "%s", indent);
+ for (auto &kv : lives)
+ {
+ const subreg_ranges &sr = kv.second;
+ if (sr.empty_p ())
+ continue;
+ fprintf (file, "%d ", kv.first);
+ if (!sr.full_p ())
+ {
+ sr.dump (file);
+ fprintf (file, " ");
+ }
+ }
+ fprintf (file, "\n");
+}
+
+/* class live_point */
+void
+live_point::dump (FILE *file) const
+{
+ if (!use_reg.empty_p ())
+ {
+ fprintf (file, "use ");
+ use_reg.dump (file);
+ if (!def_reg.empty_p ())
+ {
+ fprintf (file, ", def ");
+ def_reg.dump (file);
+ }
+ }
+ else if (!def_reg.empty_p ())
+ {
+ fprintf (file, "def ");
+ def_reg.dump (file);
+ }
+ else
+ gcc_unreachable ();
+}
+
+/* class live_points */
+void
+live_points::dump (FILE *file) const
+{
+ fprintf (file, "%u :", id);
+ if (points.empty ())
+ {
+ fprintf (file, " empty");
+ return;
+ }
+ for (const auto &kv : points)
+ {
+ fprintf (file, " ");
+ kv.second.dump (file);
+ fprintf (file, " at point %u;", kv.first);
+ }
+}
+
+/* class reg_live_ranges */
+void
+subregs_live_points::dump (FILE *file) const
+{
+ if (subreg_points.empty ())
+ {
+ fprintf (file, ";; empty\n");
+ return;
+ }
+ for (const auto &kv : subreg_points)
+ {
+ fprintf (file, ";; ");
+ kv.second.dump (file);
+ fprintf (file, "\n");
+ }
+}
+
+/* Define some usefull debug functions. */
+
+DEBUG_FUNCTION void
+debug (const subreg_range &r)
+{
+ r.dump (stderr);
+}
+
+DEBUG_FUNCTION void
+debug (const subreg_ranges &sr)
+{
+ sr.dump (stderr);
+}
+
+DEBUG_FUNCTION void
+debug (const subregs_live &l)
+{
+ l.dump (stderr, "");
+}
+
+DEBUG_FUNCTION void
+debug (const subregs_live *l)
+{
+ debug (*l);
+}
+
+DEBUG_FUNCTION void
+debug (const live_point &l)
+{
+ l.dump (stderr);
+}
+
+DEBUG_FUNCTION void
+debug (const live_points &ls)
+{
+ ls.dump (stderr);
+}
+
+DEBUG_FUNCTION void
+debug (const subregs_live_points &sls)
+{
+ sls.dump (stderr);
+}
+
+DEBUG_FUNCTION void
+debug (const subregs_live_points *sls)
+{
+ debug (*sls);
+}
+
+#if CHECKING_P
+
+namespace selftest {
+
+class subreg_range_tests
+{
+public:
+ static void run ()
+ {
+ /* class subreg_range tests. */
+ subreg_range r1 = subreg_range (1, 2);
+ subreg_range r2 = subreg_range (2, 3);
+ subreg_range r3 = subreg_range (2, 3);
+ ASSERT_FALSE (r1.same_p (r2));
+ ASSERT_TRUE (r2.same_p (r3));
+ ASSERT_TRUE (r1 < r2);
+ ASSERT_FALSE (r2 < r1);
+
+ /* class subreg_ranges tests. */
+ }
+};
+
+void
+subreg_live_range_tests ()
+{
+ subreg_range_tests::run ();
+}
+
+} // namespace selftest
+
+#endif /* CHECKING_P */
diff --git a/gcc/subreg-live-range.h b/gcc/subreg-live-range.h
new file mode 100644
index 00000000000..76e442d08e8
--- /dev/null
+++ b/gcc/subreg-live-range.h
@@ -0,0 +1,333 @@
+/* SUBREG live range track classes for DF & IRA & LRA.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+ Contributed by Lehua Ding (lehua.d...@rivai.ai), RiVAI Technologies Ltd.
+
+ 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/>. */
+
+#ifndef GCC_SUBREG_LIVE_RANGE_H
+#define GCC_SUBREG_LIVE_RANGE_H
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include <set>
+#include <map>
+
+/* class subreg_range represent bytes range [start, end) of a reg. */
+class subreg_range
+{
+public:
+ int start; /* Range start point. */
+ int end; /* Range start point. */
+
+ subreg_range (int start, int end) : start (start), end (end)
+ {
+ gcc_assert (start < end);
+ }
+
+ /* For sorting. */
+ bool operator<(const subreg_range &r) const
+ {
+ if (end <= r.start)
+ return true;
+ else if (start >= r.end)
+ return false;
+ else
+ /* Cannot sorting for overlap range. */
+ gcc_unreachable ();
+ }
+ /* Return true if R same with self. */
+ bool same_p (const subreg_range &r) const
+ {
+ return start == r.start && end == r.end;
+ }
+
+ /* Return true if range is full for 0-MAX range. */
+ bool full_p (int max) const { return start == 0 && end == max; }
+
+ /* Debug methods. */
+ void dump (FILE *file) const;
+};
+
+/* class subreg_ranges represent multiple disjoint and discontinuous
+ subreg_range. */
+class subreg_ranges
+{
+public:
+ /* The maximum boundary value of range. If for a unknown mode hard register,
+ the max set to 1. */
+ int max;
+ std::set<subreg_range> ranges;
+
+ subreg_ranges () : max (1) {}
+ subreg_ranges (int max) : max (max) { gcc_assert (max >= 1); }
+
+ /* Modify ranges. */
+ /* Return true if ranges changed. */
+ bool add_range (int max, const subreg_range &range);
+ /* Return true if ranges changed. */
+ bool remove_range (int max, const subreg_range &range);
+ /* Add SR, return true if ranges changed. */
+ bool add_ranges (const subreg_ranges &sr);
+ /* Clear ranges of SR, return true if ranges changed. */
+ bool remove_ranges (const subreg_ranges &sr);
+ /* Make range empty. */
+ void make_empty () { ranges.clear (); }
+ /* Make range full. */
+ void make_full ()
+ {
+ make_empty ();
+ ranges.insert (subreg_range (0, max));
+ }
+ /* Change max to MAX, corresponding adjust ranges. */
+ void change_max (int max)
+ {
+ gcc_assert (this->max == 1);
+ this->max = max;
+ if (full_p ())
+ make_full ();
+ }
+
+ /* Predicators. */
+ bool full_p () const
+ {
+ if (ranges.size () != 1)
+ return false;
+ const subreg_range &r = *ranges.begin ();
+ return r.start == 0 && r.end == max;
+ }
+ bool empty_p () const { return ranges.empty (); }
+ bool same_p (const subreg_ranges &sr) const;
+ bool same_p (int max, const subreg_range &range) const
+ {
+ subreg_ranges sr = subreg_ranges (max);
+ sr.add_range (max, range);
+ return same_p (sr);
+ }
+ bool include_ranges_p (const subreg_ranges &sr) const;
+ bool include_range_p (int max, const subreg_range &range) const;
+
+ /* Debug methods. */
+ void dump (FILE *file) const;
+};
+
+/* class subregs_live record the live subreg_ranges of registers. */
+class subregs_live
+{
+public:
+ /* The key is usually the register's regno. */
+ std::map<unsigned int, subreg_ranges> lives;
+
+ /* Add/clear live range. */
+ bool add_range (unsigned int regno, int max, const subreg_range &range)
+ {
+ if (lives.count (regno) == 0)
+ lives.insert ({regno, subreg_ranges (max)});
+ return lives.at (regno).add_range (max, range);
+ }
+ bool remove_range (unsigned int regno, int max, const subreg_range &range)
+ {
+ if (lives.count (regno) != 0)
+ {
+ bool changed = lives.at (regno).remove_range (max, range);
+ if (lives.at (regno).empty_p ())
+ remove_live (regno);
+ return changed;
+ }
+ return false;
+ }
+ /* Add a unexist register live range. */
+ void add_ranges (unsigned int regno, const subreg_ranges &ranges)
+ {
+ if (lives.count (regno) == 0)
+ lives.insert ({regno, ranges});
+ else
+ lives.at (regno).add_ranges (ranges);
+ }
+ bool copy_lives (const subregs_live &sl);
+ bool add_lives (const subregs_live &sl);
+ bool remove_lives (const subregs_live &sl);
+ void remove_live (unsigned int regno) { lives.erase (regno); }
+ /* Remove all register live range. */
+ void clear () { lives.clear (); }
+ void clear (unsigned min_regno)
+ {
+ if (lives.lower_bound (min_regno) != lives.end ())
+ lives.erase (lives.lower_bound (min_regno), lives.end ());
+ }
+
+ /* Return true if regno's live range is full. */
+ bool full_p (unsigned int regno) const
+ {
+ return lives.count (regno) != 0 && lives.at (regno).full_p ();
+ }
+ /* Return true if regno's live range is empty. */
+ bool empty_p (unsigned int regno) const
+ {
+ return lives.count (regno) == 0 || lives.at (regno).empty_p ();
+ }
+ /* Return true if SL same with this. */
+ bool same_p (const subregs_live &sl)
+ {
+ if (lives.size () != sl.lives.size ())
+ return false;
+ for (auto &kv : lives)
+ {
+ unsigned int regno = kv.first;
+ if (sl.empty_p (regno))
+ return false;
+ const subreg_ranges &sr = kv.second;
+ if (!sr.same_p (sl.lives.at (regno)))
+ return false;
+ }
+ return true;
+ }
+
+ /* Debug methods. */
+ void dump (FILE *file, const char *indent = ";; ") const;
+};
+
+class live_point
+{
+public:
+ int point;
+ /* subreg range be defined in current point. */
+ subreg_ranges def_reg;
+ /* subreg range be used in current point. */
+ subreg_ranges use_reg;
+
+ live_point (int max, const subreg_range &range, bool is_def)
+ : def_reg (max), use_reg (max)
+ {
+ add_range (max, range, is_def);
+ }
+ live_point (const subreg_ranges &sr, bool is_def)
+ : def_reg (sr.max), use_reg (sr.max)
+ {
+ add_ranges (sr, is_def);
+ }
+ live_point (int point, int max) : point (point), def_reg (max), use_reg (max)
+ {}
+
+ void add_range (int max, const subreg_range &r, bool is_def)
+ {
+ if (is_def)
+ def_reg.add_range (max, r);
+ else
+ use_reg.add_range (max, r);
+ }
+
+ void add_ranges (const subreg_ranges &sr, bool is_def)
+ {
+ if (is_def)
+ def_reg.add_ranges (sr);
+ else
+ use_reg.add_ranges (sr);
+ }
+
+ void dump (FILE *file) const;
+};
+
+class live_points
+{
+public:
+ int id;
+ int max;
+ std::map<int, live_point> points;
+
+ live_points (int id, int max) : id (id), max (max) {}
+
+ void add_point (int max, const subreg_range &range, bool is_def, int point)
+ {
+ gcc_assert (this->max == max || this->max == 1 || max == 1);
+ if (points.count (point) == 0)
+ points.insert ({point, {max, range, is_def}});
+ else
+ points.at (point).add_range (max, range, is_def);
+ }
+ void dump (FILE *file) const;
+};
+
+class subregs_live_points
+{
+public:
+ std::map<int, live_points> subreg_points;
+ std::map<int, int> last_start_points;
+ std::map<int, subreg_ranges> subreg_live_ranges;
+
+ void add_point (int id, int max, const subreg_range &range, bool is_def,
+ int point)
+ {
+ if (!is_def && empty_live_p (id))
+ {
+ if (last_start_points.count (id) == 0)
+ last_start_points.insert ({id, point});
+ else
+ last_start_points.at (id) = point;
+ }
+
+ if (subreg_points.count (id) == 0)
+ subreg_points.insert ({id, live_points (id, max)});
+
+ subreg_points.at (id).add_point (max, range, is_def, point);
+
+ if (subreg_live_ranges.count (id) == 0)
+ subreg_live_ranges.insert ({id, subreg_ranges (max)});
+
+ if (is_def)
+ subreg_live_ranges.at (id).remove_range (max, range);
+ else
+ subreg_live_ranges.at (id).add_range (max, range);
+ }
+
+ void add_range (int id, int max, const subreg_range &range, bool is_def)
+ {
+ if (subreg_live_ranges.count (id) == 0)
+ subreg_live_ranges.insert ({id, subreg_ranges (max)});
+
+ if (is_def)
+ subreg_live_ranges.at (id).remove_range (max, range);
+ else
+ subreg_live_ranges.at (id).add_range (max, range);
+ }
+
+ bool full_live_p (int id)
+ {
+ return subreg_live_ranges.count (id) != 0
+ && subreg_live_ranges.at (id).full_p ();
+ }
+
+ bool empty_live_p (int id)
+ {
+ return subreg_live_ranges.count (id) == 0
+ || subreg_live_ranges.at (id).empty_p ();
+ }
+
+ int get_start_point (int id)
+ {
+ int start_point = last_start_points.at (id);
+ gcc_assert (start_point != -1);
+ return start_point;
+ }
+
+ void clear_live_ranges () { subreg_live_ranges.clear (); }
+
+ /* Debug methods. */
+ void dump (FILE *file) const;
+};
+
+#endif /* GCC_SUBREG_LIVE_RANGE_H */
diff --git a/gcc/timevar.def b/gcc/timevar.def
index d21b08c030d..7c173d3c7c8 100644
--- a/gcc/timevar.def
+++ b/gcc/timevar.def
@@ -120,6 +120,7 @@ DEFTIMEVAR (TV_DF_SCAN , "df scan insns")
DEFTIMEVAR (TV_DF_MD , "df multiple defs")
DEFTIMEVAR (TV_DF_RD , "df reaching defs")
DEFTIMEVAR (TV_DF_LR , "df live regs")
+DEFTIMEVAR (TV_DF_LIVE_SUBREG , "df live subregs")
DEFTIMEVAR (TV_DF_LIVE , "df live&initialized regs")
DEFTIMEVAR (TV_DF_MIR , "df must-initialized regs")
DEFTIMEVAR (TV_DF_CHAIN , "df use-def / def-use chains")
