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re PR rtl-optimization/42575 (arm-eabi-gcc 64-bit multiply weirdness) 

PR rtl-optimization/42575
	* dce.c (word_dce_process_block): Renamed from byte_dce_process_block.
	Argument AU removed.  All callers changed.  Ignore artificial refs.
	Use return value of df_word_lr_simulate_defs to decide whether an insn
	is necessary.
	(fast_dce): Rename arg to WORD_LEVEL.
	(run_word_dce): Renamed from rest_of_handle_fast_byte_dce.  No longer
	static.
	(pass_fast_rtl_byte_dce): Delete.
	* dce.h (run_word_dce): Declare.
	* df-core.c (df_print_word_regset): Renamed from df_print_byteregset.
	All callers changed.  Simplify code to only deal with two-word regs.
	* df.h (DF_WORD_LR): Renamed from DF_BYTE_LR.
	(DF_WORD_LR_BB_INFO): Renamed from DF_BYTE_LR_BB_INFO.
	(DF_WORD_LR_IN): Renamed from DF_BYTE_LR_IN.
	(DF_WORD_LR_OUT): Renamed from DF_BYTE_LR_OUT.
	(struct df_word_lr_bb_info): Renamed from df_byte_lr_bb_info.
	(df_word_lr_mark_ref): Declare.
	(df_word_lr_add_problem, df_word_lr_mark_ref, df_word_lr_simulate_defs,
	df_word_lr_simulate_uses): Declare or rename from byte variants.
	(df_byte_lr_simulate_artificial_refs_at_top,
	df_byte_lr_simulate_artificial_refs_at_end, df_byte_lr_get_regno_start,
	df_byte_lr_get_regno_len, df_compute_accessed_bytes): Delete
	declarations.
	(df_word_lr_get_bb_info): Rename from df_byte_lr_get_bb_info.
	(enum df_mm): Delete.
	* df-byte-scan.c: Delete file.
	* df-problems.c (df_word_lr_problem_data): Renamed from
	df_byte_lr_problem_data, all members deleted except for
	WORD_LR_BITMAPS, which is renamed from BYTE_LR_BITMAPS.  Uses changed.
	(df_word_lr_expand_bitmap, df_byte_lr_simulate_artificial_refs_at_top,
	df_byte_lr_simulate_artificial_refs_at_end, df_byte_lr_get_regno_start,
	df_byte_lr_get_regno_len, df_byte_lr_check_regs,
	df_byte_lr_confluence_0): Delete functions.
	(df_word_lr_free_bb_info): Renamed from df_byte_lr_free_bb_info; all
	callers changed.
	(df_word_lr_alloc): Renamed from df_byte_lr_alloc; all callers changed.
	Don't initialize members that were deleted, don't try to discover data
	about registers.  Ignore hard regs.
	(df_word_lr_reset): Renamed from df_byte_lr_reset; all callers changed.
	(df_word_lr_mark_ref): New function.
	(df_word_lr_bb_local_compute): Renamed from
	df_byte_bb_lr_local_compute; all callers changed.  Use
	df_word_lr_mark_ref.  Assert that artificial refs don't include
	pseudos.  Ignore hard registers.
	(df_word_lr_local_compute): Renamed from df_byte_lr_local_compute.
	Assert that exit block uses don't contain pseudos.
	(df_word_lr_init): Renamed from df_byte_lr_init; all callers changed.
	(df_word_lr_confluence_n): Renamed from df_byte_lr_confluence_n; all
	callers changed.  Ignore hard regs.
	(df_word_lr_transfer_function): Renamed from
	df_byte_lr_transfer_function; all callers changed.
	(df_word_lr_free): Renamed from df_byte_lr_free; all callers changed.
	(df_word_lr_top_dump): Renamed from df_byte_lr_top_dump; all callers
	changed.
	(df_word_lr_bottom_dump): Renamed from df_byte_lr_bottom_dump; all
	callers changed.
	(problem_WORD_LR): Renamed from problem_BYTE_LR; uses changed;
	confluence operator 0 set to NULL.
	(df_word_lr_add_problem): Renamed from df_byte_lr_add_problem; all
	callers changed.
	(df_word_lr_simulate_defs): Renamed from df_byte_lr_simulate_defs.
	Return bool, true if bitmap changed or insn otherwise necessary.
	All callers changed.  Simplify using df_word_lr_mark_ref.
	(df_word_lr_simulate_uses): Renamed from df_byte_lr_simulate_uses;
	all callers changed.  Simplify using df_word_lr_mark_ref.
	* lower-subreg.c: Include "dce.h"
	(decompose_multiword_subregs): Call run_word_dce if df available.
	* Makefile.in (lower-subreg.o): Adjust dependencies.
	(df-byte-scan.o): Delete.
	* timevar.def (TV_DF_WORD_LR): Renamed from TV_DF_BYTE_LR.

From-SVN: r162678
This commit is contained in:
Bernd Schmidt 2010-07-29 12:39:57 +00:00 committed by Bernd Schmidt
parent 9b638c031a
commit 8d0741923d
10 changed files with 300 additions and 965 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
gcc/ChangeLog
View File

@ -1,3 +1,77 @@
2010-07-29 Bernd Schmidt <bernds@codesourcery.com>
PR rtl-optimization/42575
* dce.c (word_dce_process_block): Renamed from byte_dce_process_block.
Argument AU removed. All callers changed. Ignore artificial refs.
Use return value of df_word_lr_simulate_defs to decide whether an insn
is necessary.
(fast_dce): Rename arg to WORD_LEVEL.
(run_word_dce): Renamed from rest_of_handle_fast_byte_dce. No longer
static.
(pass_fast_rtl_byte_dce): Delete.
* dce.h (run_word_dce): Declare.
* df-core.c (df_print_word_regset): Renamed from df_print_byteregset.
All callers changed. Simplify code to only deal with two-word regs.
* df.h (DF_WORD_LR): Renamed from DF_BYTE_LR.
(DF_WORD_LR_BB_INFO): Renamed from DF_BYTE_LR_BB_INFO.
(DF_WORD_LR_IN): Renamed from DF_BYTE_LR_IN.
(DF_WORD_LR_OUT): Renamed from DF_BYTE_LR_OUT.
(struct df_word_lr_bb_info): Renamed from df_byte_lr_bb_info.
(df_word_lr_mark_ref): Declare.
(df_word_lr_add_problem, df_word_lr_mark_ref, df_word_lr_simulate_defs,
df_word_lr_simulate_uses): Declare or rename from byte variants.
(df_byte_lr_simulate_artificial_refs_at_top,
df_byte_lr_simulate_artificial_refs_at_end, df_byte_lr_get_regno_start,
df_byte_lr_get_regno_len, df_compute_accessed_bytes): Delete
declarations.
(df_word_lr_get_bb_info): Rename from df_byte_lr_get_bb_info.
(enum df_mm): Delete.
* df-byte-scan.c: Delete file.
* df-problems.c (df_word_lr_problem_data): Renamed from
df_byte_lr_problem_data, all members deleted except for
WORD_LR_BITMAPS, which is renamed from BYTE_LR_BITMAPS. Uses changed.
(df_word_lr_expand_bitmap, df_byte_lr_simulate_artificial_refs_at_top,
df_byte_lr_simulate_artificial_refs_at_end, df_byte_lr_get_regno_start,
df_byte_lr_get_regno_len, df_byte_lr_check_regs,
df_byte_lr_confluence_0): Delete functions.
(df_word_lr_free_bb_info): Renamed from df_byte_lr_free_bb_info; all
callers changed.
(df_word_lr_alloc): Renamed from df_byte_lr_alloc; all callers changed.
Don't initialize members that were deleted, don't try to discover data
about registers. Ignore hard regs.
(df_word_lr_reset): Renamed from df_byte_lr_reset; all callers changed.
(df_word_lr_mark_ref): New function.
(df_word_lr_bb_local_compute): Renamed from
df_byte_bb_lr_local_compute; all callers changed. Use
df_word_lr_mark_ref. Assert that artificial refs don't include
pseudos. Ignore hard registers.
(df_word_lr_local_compute): Renamed from df_byte_lr_local_compute.
Assert that exit block uses don't contain pseudos.
(df_word_lr_init): Renamed from df_byte_lr_init; all callers changed.
(df_word_lr_confluence_n): Renamed from df_byte_lr_confluence_n; all
callers changed. Ignore hard regs.
(df_word_lr_transfer_function): Renamed from
df_byte_lr_transfer_function; all callers changed.
(df_word_lr_free): Renamed from df_byte_lr_free; all callers changed.
(df_word_lr_top_dump): Renamed from df_byte_lr_top_dump; all callers
changed.
(df_word_lr_bottom_dump): Renamed from df_byte_lr_bottom_dump; all
callers changed.
(problem_WORD_LR): Renamed from problem_BYTE_LR; uses changed;
confluence operator 0 set to NULL.
(df_word_lr_add_problem): Renamed from df_byte_lr_add_problem; all
callers changed.
(df_word_lr_simulate_defs): Renamed from df_byte_lr_simulate_defs.
Return bool, true if bitmap changed or insn otherwise necessary.
All callers changed. Simplify using df_word_lr_mark_ref.
(df_word_lr_simulate_uses): Renamed from df_byte_lr_simulate_uses;
all callers changed. Simplify using df_word_lr_mark_ref.
* lower-subreg.c: Include "dce.h"
(decompose_multiword_subregs): Call run_word_dce if df available.
* Makefile.in (lower-subreg.o): Adjust dependencies.
(df-byte-scan.o): Delete.
* timevar.def (TV_DF_WORD_LR): Renamed from TV_DF_BYTE_LR.
2010-07-29 Richard Guenther <rguenther@suse.de>
* tree.c (build_vector): Assert that the vector constant

5
gcc/Makefile.in
View File

@ -1202,7 +1202,6 @@ OBJS-common = \
dce.o \
ddg.o \
debug.o \
df-byte-scan.o \
df-core.o \
df-problems.o \
df-scan.o \
@ -3167,8 +3166,6 @@ df-scan.o : df-scan.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
hard-reg-set.h $(BASIC_BLOCK_H) $(DF_H) $(BITMAP_H) sbitmap.h $(TIMEVAR_H) \
$(TM_P_H) $(FLAGS_H) $(TARGET_H) $(TARGET_DEF_H) $(TREE_H) output.h \
$(TREE_PASS_H) $(EMIT_RTL_H)
df-byte-scan.o : df-byte-scan.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
$(TM_P_H) $(DF_H) output.h $(DBGCNT_H)
regstat.o : regstat.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
$(TM_P_H) $(FLAGS_H) $(REGS_H) output.h $(EXCEPT_H) hard-reg-set.h \
$(BASIC_BLOCK_H) $(TIMEVAR_H) $(DF_H)
@ -3487,7 +3484,7 @@ dbgcnt.o: dbgcnt.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TOPLEV_H) $(DIAGNOSTIC_
lower-subreg.o : lower-subreg.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
$(MACHMODE_H) $(TM_H) $(RTL_H) $(TM_P_H) $(TIMEVAR_H) $(FLAGS_H) \
insn-config.h $(BASIC_BLOCK_H) $(RECOG_H) $(OBSTACK_H) $(BITMAP_H) \
$(EXPR_H) $(EXCEPT_H) $(REGS_H) $(TREE_PASS_H) $(DF_H)
$(EXPR_H) $(EXCEPT_H) $(REGS_H) $(TREE_PASS_H) $(DF_H) dce.h
target-globals.o : target-globals.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
$(TM_H) insn-config.h $(MACHMODE_H) $(GGC_H) $(TOPLEV_H) target-globals.h \
$(FLAGS_H) $(REGS_H) $(RTL_H) reload.h expmed.h $(EXPR_H) $(OPTABS_H) \

112
gcc/dce.c
View File

@ -767,12 +767,11 @@ struct rtl_opt_pass pass_ud_rtl_dce =
artificial uses. */
static bool
byte_dce_process_block (basic_block bb, bool redo_out, bitmap au)
word_dce_process_block (basic_block bb, bool redo_out)
{
bitmap local_live = BITMAP_ALLOC (&dce_tmp_bitmap_obstack);
rtx insn;
bool block_changed;
df_ref *def_rec;
if (redo_out)
{
@ -781,8 +780,8 @@ byte_dce_process_block (basic_block bb, bool redo_out, bitmap au)
set. */
edge e;
edge_iterator ei;
df_confluence_function_n con_fun_n = df_byte_lr->problem->con_fun_n;
bitmap_clear (DF_BYTE_LR_OUT (bb));
df_confluence_function_n con_fun_n = df_word_lr->problem->con_fun_n;
bitmap_clear (DF_WORD_LR_OUT (bb));
FOR_EACH_EDGE (e, ei, bb->succs)
(*con_fun_n) (e);
}
@ -790,76 +789,38 @@ byte_dce_process_block (basic_block bb, bool redo_out, bitmap au)
if (dump_file)
{
fprintf (dump_file, "processing block %d live out = ", bb->index);
df_print_byte_regset (dump_file, DF_BYTE_LR_OUT (bb));
df_print_word_regset (dump_file, DF_WORD_LR_OUT (bb));
}
bitmap_copy (local_live, DF_BYTE_LR_OUT (bb));
df_byte_lr_simulate_artificial_refs_at_end (bb, local_live);
bitmap_copy (local_live, DF_WORD_LR_OUT (bb));
FOR_BB_INSNS_REVERSE (bb, insn)
if (INSN_P (insn))
{
/* The insn is needed if there is someone who uses the output. */
for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++)
{
df_ref def = *def_rec;
unsigned int last;
unsigned int dregno = DF_REF_REGNO (def);
unsigned int start = df_byte_lr_get_regno_start (dregno);
unsigned int len = df_byte_lr_get_regno_len (dregno);
unsigned int sb;
unsigned int lb;
/* This is one of the only places where DF_MM_MAY should
be used for defs. Need to make sure that we are
checking for all of the bits that may be used. */
if (!df_compute_accessed_bytes (def, DF_MM_MAY, &sb, &lb))
{
start += sb;
len = lb - sb;
}
if (bitmap_bit_p (au, dregno))
{
mark_insn (insn, true);
goto quickexit;
}
last = start + len;
while (start < last)
if (bitmap_bit_p (local_live, start++))
{
mark_insn (insn, true);
goto quickexit;
}
}
quickexit:
bool any_changed;
/* No matter if the instruction is needed or not, we remove
any regno in the defs from the live set. */
df_byte_lr_simulate_defs (insn, local_live);
any_changed = df_word_lr_simulate_defs (insn, local_live);
if (any_changed)
mark_insn (insn, true);
/* On the other hand, we do not allow the dead uses to set
anything in local_live. */
if (marked_insn_p (insn))
df_byte_lr_simulate_uses (insn, local_live);
df_word_lr_simulate_uses (insn, local_live);
if (dump_file)
{
fprintf (dump_file, "finished processing insn %d live out = ",
INSN_UID (insn));
df_print_byte_regset (dump_file, local_live);
df_print_word_regset (dump_file, local_live);
}
}
df_byte_lr_simulate_artificial_refs_at_top (bb, local_live);
block_changed = !bitmap_equal_p (local_live, DF_BYTE_LR_IN (bb));
block_changed = !bitmap_equal_p (local_live, DF_WORD_LR_IN (bb));
if (block_changed)
bitmap_copy (DF_BYTE_LR_IN (bb), local_live);
bitmap_copy (DF_WORD_LR_IN (bb), local_live);
BITMAP_FREE (local_live);
return block_changed;
}
@ -938,12 +899,12 @@ dce_process_block (basic_block bb, bool redo_out, bitmap au)
}
/* Perform fast DCE once initialization is done. If BYTE_LEVEL is
true, use the byte level dce, otherwise do it at the pseudo
/* Perform fast DCE once initialization is done. If WORD_LEVEL is
true, use the word level dce, otherwise do it at the pseudo
level. */
static void
fast_dce (bool byte_level)
fast_dce (bool word_level)
{
int *postorder = df_get_postorder (DF_BACKWARD);
int n_blocks = df_get_n_blocks (DF_BACKWARD);
@ -985,10 +946,9 @@ fast_dce (bool byte_level)
continue;
}
if (byte_level)
if (word_level)
local_changed
= byte_dce_process_block (bb, bitmap_bit_p (redo_out, index),
bb_has_eh_pred (bb) ? au_eh : au);
= word_dce_process_block (bb, bitmap_bit_p (redo_out, index));
else
local_changed
= dce_process_block (bb, bitmap_bit_p (redo_out, index),
@ -1028,8 +988,8 @@ fast_dce (bool byte_level)
to redo the dataflow equations for the blocks that had a
change at the top of the block. Then we need to redo the
iteration. */
if (byte_level)
df_analyze_problem (df_byte_lr, all_blocks, postorder, n_blocks);
if (word_level)
df_analyze_problem (df_word_lr, all_blocks, postorder, n_blocks);
else
df_analyze_problem (df_lr, all_blocks, postorder, n_blocks);
@ -1062,14 +1022,15 @@ rest_of_handle_fast_dce (void)
/* Fast byte level DCE. */
static unsigned int
rest_of_handle_fast_byte_dce (void)
void
run_word_dce (void)
{
df_byte_lr_add_problem ();
timevar_push (TV_DCE);
df_word_lr_add_problem ();
init_dce (true);
fast_dce (true);
fini_dce (true);
return 0;
timevar_pop (TV_DCE);
}
@ -1139,24 +1100,3 @@ struct rtl_opt_pass pass_fast_rtl_dce =
TODO_ggc_collect /* todo_flags_finish */
}
};
struct rtl_opt_pass pass_fast_rtl_byte_dce =
{
{
RTL_PASS,
"byte-dce", /* name */
gate_fast_dce, /* gate */
rest_of_handle_fast_byte_dce, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_DCE, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_dump_func |
TODO_df_finish | TODO_verify_rtl_sharing |
TODO_ggc_collect /* todo_flags_finish */
}
};

1
gcc/dce.h
View File

@ -20,6 +20,7 @@ along with GCC; see the file COPYING3. If not see
#ifndef GCC_DCE_H
#define GCC_DCE_H
extern void run_word_dce (void);
extern void run_fast_dce (void);
extern void run_fast_df_dce (void);

340
gcc/df-byte-scan.c
View File

@ -1,340 +0,0 @@
/* Scanning of rtl byte level scanning for dataflow analysis.
Copyright (C) 2008 Free Software Foundation, Inc.
Contributed by Kenneth Zadeck (zadeck@naturalbridge.com).
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 "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "tm_p.h"
#include "df.h"
#include "output.h"
#include "dbgcnt.h"
/* The following suite of functions provides bytewise modeling of REFs
which are struct df_ref. START_BYTE and LAST_BYTE are returned.
These can be used as indexes into bitmaps. The indexes are
normalized so that 0 is the lowest numbered byte, of the inner
register according to the natural ordering of the machine.
This code is designed to be used in backwards scans (which is, of
course, the way all dataflow scanning should really be done). It
would require a lot of reworking of the api to make it work in a
forwards scanning world. */
/* Helper for df_compute_accessed_bytes. Ref is some sort of extract.
Return true if this effects the entire reg in REF. Return false if
otherwise and set START_BYTE and LAST_BYTE. See the description of
df_compute_accessed_bytes for a description of MM. */
static bool
df_compute_accessed_bytes_extract (df_ref ref,
enum df_mm mm ,
unsigned int *start_byte,
unsigned int *last_byte)
{
int start;
int last;
rtx reg = DF_REF_REG (ref);
enum machine_mode m1;
int m1_size;
enum machine_mode m2;
int m2_size;
/* (*_extract:M1 (reg:M2 X) WIDTH POS)
(*_extract:M1 (subreg:M1 (reg:M2 X N) WIDTH POS)
This is a bitfield extraction. The assignment clobbers/extracts
exactly the bits named by WIDTH and POS and does not affect the
other bits in register X. It is also technically possible that
the bits asked for are longer than units per word. */
int offset = DF_REF_EXTRACT_OFFSET (ref);
int width = DF_REF_EXTRACT_WIDTH (ref);
if (width == -1 || offset == -1)
return true;
m1 = DF_REF_EXTRACT_MODE (ref);
m1_size = GET_MODE_SIZE (m1);
gcc_assert (m1_size <= UNITS_PER_WORD);
/* There is nothing to do if this is a pure big or small endian
machine, but if the machine is a pastiche, we have to convert the
bit offsets into byte offsets. This is only possible because we
do not care about individual bits because this conversion may
make the bits non-contiguous. */
if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN)
offset = GET_MODE_BITSIZE (m1_size) - (offset + width);
/* The offset is now in the same order as the subreg_byte. */
if (GET_CODE (reg) == SUBREG)
{
m2 = GET_MODE (SUBREG_REG (reg));
m2_size = GET_MODE_SIZE (m2);
if (m1_size > m2_size)
/* If it is paradoxical, subreg_byte will be zero. */
offset -= subreg_lowpart_offset (m2, m1) * BITS_PER_UNIT;
else
offset += SUBREG_BYTE (reg) * BITS_PER_UNIT;
}
else
{
m2 = GET_MODE (reg);
m2_size = GET_MODE_SIZE (m2);
}
if (mm == DF_MM_MUST)
{
/* For defs (generally), count the byte only if the whole byte
is touched. */
start = (offset + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
last = (width + offset) / BITS_PER_UNIT;
/* In the case where there is nothing, start may be one larger
than last, we canonize this to return zeros. This keeps
computations of length from being negative. */
if (start >= last)
{
start = 0;
last = 0;
}
}
else
{
/* For uses (generally), count the byte if any part of the byte
is touched. */
start = offset / BITS_PER_UNIT;
last = (width + offset + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
}
/* Paradoxical truncation. */
if (start < 0)
start = 0;
if (last > m2_size)
last = m2_size;
if (dump_file)
fprintf (dump_file, " cpb extract regno=%d start=%d last=%d\n",
DF_REF_REGNO (ref), start, last);
*start_byte = start;
*last_byte = last;
return false;
}
/* Helper for df_compute_accessed_bytes. Ref is a strict_low_part.
Return true if this effects the entire reg in REF. Return false if
otherwise and set START_BYTE and LAST_BYTE. */
static bool
df_compute_accessed_bytes_strict_low_part (df_ref ref,
unsigned int *start_byte,
unsigned int *last_byte)
{
int start;
int last;
rtx reg = DF_REF_REG (ref);
enum machine_mode m1;
int m1_size;
enum machine_mode m2;
int m2_size;
int offset;
/* In order to accommodate multiword subregs of a hardreg, df_scan
eats the subreg and it can only be found from the loc. */
if (REG_P (reg))
reg = *(DF_REF_LOC (ref));
m1 = GET_MODE (reg);
m1_size = GET_MODE_SIZE (m1);
m2 = GET_MODE (SUBREG_REG (reg));
m2_size = GET_MODE_SIZE (m2);
offset = SUBREG_BYTE (reg);
/* It does not seem to be meaningful to apply a strict_low_part of a
paradoxical register. */
gcc_assert (m1_size <= m2_size);
/* (set (strict_low_part (subreg:M1 (reg:M2 X) N)) ...)
This is a bitfield insertion. The assignment clobbers exactly the
bits named by the subreg--the M1 bits at position N. It is also
technically possible that the bits asked for are longer than units
per word. */
start = offset;
last = offset + m1_size;
if (dump_file)
fprintf (dump_file, " cpb strict low part regno=%d start=%d last=%d\n",
DF_REF_REGNO (ref), start, last);
*start_byte = start;
*last_byte = last;
return false;
}
/* Helper for df_compute_accessed_bytes. Ref is a naked subreg.
Return true if this effects the entire reg in REF. Return false if
otherwise and set START_BYTE and LAST_BYTE. */
static bool
df_compute_accessed_bytes_subreg (df_ref ref, unsigned int *start_byte,
unsigned int *last_byte)
{
/* (subreg:M1 (reg:M2 X) N) */
int start;
int last;
rtx reg = DF_REF_REG (ref);
enum machine_mode m1;
int m1_size;
enum machine_mode m2;
int m2_size;
/* In order to accommodate multiword subregs of a hardreg, df_scan
eats the subreg and it can only be found from the loc. */
if (REG_P (reg))
reg = *(DF_REF_LOC (ref));
m1 = GET_MODE (reg);
m1_size = GET_MODE_SIZE (m1);
m2 = GET_MODE (SUBREG_REG (reg));
m2_size = GET_MODE_SIZE (m2);
/* A simple paradoxical subreg just accesses the entire inner reg. */
if (m1_size >= m2_size)
return true;
/* Defs and uses are different in the amount of the reg that touch. */
if (DF_REF_REG_DEF_P (ref))
{
/* This is an lvalue. */
if (m2_size > UNITS_PER_WORD)
{
/* The assignment clobbers UNITS_PER_WORD segments of X.
Look at the bytes named by the subreg, and expand it to
cover a UNITS_PER_WORD part of register X. That part of
register X is clobbered, the rest is not.
E.g., (subreg:SI (reg:DI X) 0), where UNITS_PER_WORD is the
size of SImode, clobbers the first SImode part of X, and does
not affect the second SImode part.
E.g., (subreg:QI (reg:DI X) 0), where UNITS_PER_WORD is the
size of SImode, clobbers the first SImode part of X, and does
not affect the second SImode part. Here the QImode byte is
expanded to a UNITS_PER_WORD portion of the register for
purposes of determining what is clobbered.
If this is an rvalue, then it touches just the bytes that it
talks about. */
int offset = SUBREG_BYTE (reg);
start = offset & ~(UNITS_PER_WORD - 1);
last = (offset + m1_size + UNITS_PER_WORD - 1)
& ~(UNITS_PER_WORD - 1);
}
else
/* Whole register size M2 equal to or smaller than
UNITS_PER_WORD The assignment clobbers the entire register
X. */
return true;
}
else
{
/* This is an rvalue. It touches just the bytes they explicitly
mentioned. */
int offset = SUBREG_BYTE (reg);
start = offset;
last = start + m1_size;
}
if (dump_file)
fprintf (dump_file, " cpb subreg regno=%d start=%d last=%d\n",
DF_REF_REGNO (ref), start, last);
*start_byte = start;
*last_byte = last;
return false;
}
/* Compute the set of affected bytes by a store to a pseudo to REF.
MM is either DF_MM_MAY or DF_MM_MUST. This is only relevant for
the extracts which are not aligned to byte boundaries. The
DF_MM_MAY returns all of the bytes that any bit is set in and the
DF_MM_MUST returns only the bytes that are completely covered. In
general DF_MM_MAY is used for uses and DF_MM_MUST is used for defs,
but there are exceptions such as the inner loop of the byte level
dead code eliminator which needs DF_MM_MAY for the defs to see if
it any possible bit could be used.
If the store is to the whole register, just return TRUE, if it is
to part of the register, return FALSE and set START_BYTE and
LAST_BYTE properly. In the case where fabricated uses are passed
in, START_BYTE and LAST_BYTE are set to 0 and false is returned.
This means that this use can be ignored. */
bool
df_compute_accessed_bytes (df_ref ref, enum df_mm mm,
unsigned int *start_byte,
unsigned int *last_byte)
{
if (!dbg_cnt (df_byte_scan))
return true;
if (!DF_REF_REG_DEF_P (ref)
&& DF_REF_FLAGS_IS_SET (ref, DF_REF_READ_WRITE))
{
if (DF_REF_FLAGS_IS_SET (ref, DF_REF_PRE_POST_MODIFY))
/* Pre/post modify/inc/dec always read and write the entire
reg. */
return true;
else
{
/* DF_REF_READ_WRITE on a use (except for the
DF_REF_PRE_POST_MODIFY) means that this use is fabricated
from a def that is a partial set to a multiword reg.
Here, we only model those cases precisely so the only one
to consider is the use put on a auto inc and dec
insns. */
*start_byte = 0;
*last_byte = 0;
return false;
}
}
if (DF_REF_FLAGS_IS_SET (ref, DF_REF_SIGN_EXTRACT | DF_REF_ZERO_EXTRACT))
return df_compute_accessed_bytes_extract (ref, mm, start_byte, last_byte);
else if (DF_REF_FLAGS_IS_SET (ref, DF_REF_STRICT_LOW_PART))
return df_compute_accessed_bytes_strict_low_part (ref,
start_byte, last_byte);
else if (GET_CODE (DF_REF_REG (ref)) == SUBREG)
return df_compute_accessed_bytes_subreg (ref, start_byte, last_byte);
return true;
}

57
gcc/df-core.c
View File

@ -1919,58 +1919,33 @@ df_print_regset (FILE *file, bitmap r)
debugging dump. */
void
df_print_byte_regset (FILE *file, bitmap r)
df_print_word_regset (FILE *file, bitmap r)
{
unsigned int max_reg = max_reg_num ();
bitmap_iterator bi;
if (r == NULL)
fputs (" (nil)", file);
else
{
unsigned int i;
for (i = 0; i < max_reg; i++)
for (i = FIRST_PSEUDO_REGISTER; i < max_reg; i++)
{
unsigned int first = df_byte_lr_get_regno_start (i);
unsigned int len = df_byte_lr_get_regno_len (i);
if (len > 1)
bool found = (bitmap_bit_p (r, 2 * i)
|| bitmap_bit_p (r, 2 * i + 1));
if (found)
{
bool found = false;
unsigned int j;
EXECUTE_IF_SET_IN_BITMAP (r, first, j, bi)
{
found = j < first + len;
break;
}
if (found)
{
const char * sep = "";
fprintf (file, " %d", i);
if (i < FIRST_PSEUDO_REGISTER)
fprintf (file, " [%s]", reg_names[i]);
fprintf (file, "(");
EXECUTE_IF_SET_IN_BITMAP (r, first, j, bi)
{
if (j > first + len - 1)
break;
fprintf (file, "%s%d", sep, j-first);
sep = ", ";
}
fprintf (file, ")");
}
int word;
const char * sep = "";
fprintf (file, " %d", i);
fprintf (file, "(");
for (word = 0; word < 2; word++)
if (bitmap_bit_p (r, 2 * i + word))
{
fprintf (file, "%s%d", sep, word);
sep = ", ";
}
fprintf (file, ")");
}
else
{
if (bitmap_bit_p (r, first))
{
fprintf (file, " %d", i);
if (i < FIRST_PSEUDO_REGISTER)
fprintf (file, " [%s]", reg_names[i]);
}
}
}
}
fprintf (file, "\n");

618
gcc/df-problems.c
View File

@ -2286,84 +2286,31 @@ df_chain_add_problem (unsigned int chain_flags)
/*----------------------------------------------------------------------------
BYTE LEVEL LIVE REGISTERS
WORD LEVEL LIVE REGISTERS
Find the locations in the function where any use of a pseudo can
reach in the backwards direction. In and out bitvectors are built
for each basic block. There are two mapping functions,
df_byte_lr_get_regno_start and df_byte_lr_get_regno_len that are
used to map regnos into bit vector positions.
This problem differs from the regular df_lr function in the way
that subregs, *_extracts and strict_low_parts are handled. In lr
these are consider partial kills, here, the exact set of bytes is
modeled. Note that any reg that has none of these operations is
only modeled with a single bit since all operations access the
entire register.
This problem is more brittle that the regular lr. It currently can
be used in dce incrementally, but cannot be used in an environment
where insns are created or modified. The problem is that the
mapping of regnos to bitmap positions is relatively compact, in
that if a pseudo does not do any of the byte wise operations, only
one slot is allocated, rather than a slot for each byte. If insn
are created, where a subreg is used for a reg that had no subregs,
the mapping would be wrong. Likewise, there are no checks to see
that new pseudos have been added. These issues could be addressed
by adding a problem specific flag to not use the compact mapping,
if there was a need to do so.
for each basic block. We only track pseudo registers that have a
size of 2 * UNITS_PER_WORD; bitmaps are indexed by 2 * regno and
contain two bits corresponding to each of the subwords.
----------------------------------------------------------------------------*/
/* Private data used to verify the solution for this problem. */
struct df_byte_lr_problem_data
struct df_word_lr_problem_data
{
/* Expanded versions of bitvectors used in lr. */
bitmap_head invalidated_by_call;
bitmap_head hardware_regs_used;
/* Indexed by regno, this is true if there are subregs, extracts or
strict_low_parts for this regno. */
bitmap_head needs_expansion;
/* The start position and len for each regno in the various bit
vectors. */
unsigned int* regno_start;
unsigned int* regno_len;
/* An obstack for the bitmaps we need for this problem. */
bitmap_obstack byte_lr_bitmaps;
bitmap_obstack word_lr_bitmaps;
};
/* Get the starting location for REGNO in the df_byte_lr bitmaps. */
int
df_byte_lr_get_regno_start (unsigned int regno)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;;
return problem_data->regno_start[regno];
}
/* Get the len for REGNO in the df_byte_lr bitmaps. */
int
df_byte_lr_get_regno_len (unsigned int regno)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;;
return problem_data->regno_len[regno];
}
/* Free basic block info. */
static void
df_byte_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
df_word_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
struct df_byte_lr_bb_info *bb_info = (struct df_byte_lr_bb_info *) vbb_info;
struct df_word_lr_bb_info *bb_info = (struct df_word_lr_bb_info *) vbb_info;
if (bb_info)
{
bitmap_clear (&bb_info->use);
@ -2374,65 +2321,21 @@ df_byte_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
}
/* Check all of the refs in REF_REC to see if any of them are
extracts, subregs or strict_low_parts. */
static void
df_byte_lr_check_regs (df_ref *ref_rec)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
for (; *ref_rec; ref_rec++)
{
df_ref ref = *ref_rec;
if (DF_REF_FLAGS_IS_SET (ref, DF_REF_SIGN_EXTRACT
| DF_REF_ZERO_EXTRACT
| DF_REF_STRICT_LOW_PART)
|| GET_CODE (DF_REF_REG (ref)) == SUBREG)
bitmap_set_bit (&problem_data->needs_expansion, DF_REF_REGNO (ref));
}
}
/* Expand bitmap SRC which is indexed by regno to DEST which is indexed by
regno_start and regno_len. */
static void
df_byte_lr_expand_bitmap (bitmap dest, bitmap src)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
bitmap_iterator bi;
unsigned int i;
bitmap_clear (dest);
EXECUTE_IF_SET_IN_BITMAP (src, 0, i, bi)
{
bitmap_set_range (dest, problem_data->regno_start[i],
problem_data->regno_len[i]);
}
}
/* Allocate or reset bitmaps for DF_BYTE_LR blocks. The solution bits are
/* Allocate or reset bitmaps for DF_WORD_LR blocks. The solution bits are
not touched unless the block is new. */
static void
df_byte_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
df_word_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
basic_block bb;
unsigned int regno;
unsigned int index = 0;
unsigned int max_reg = max_reg_num();
struct df_byte_lr_problem_data *problem_data
= XNEW (struct df_byte_lr_problem_data);
struct df_word_lr_problem_data *problem_data
= XNEW (struct df_word_lr_problem_data);
df_byte_lr->problem_data = problem_data;
df_word_lr->problem_data = problem_data;
df_grow_bb_info (df_byte_lr);
df_grow_bb_info (df_word_lr);
/* Create the mapping from regnos to slots. This does not change
unless the problem is destroyed and recreated. In particular, if
@ -2440,58 +2343,17 @@ df_byte_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
want to redo the mapping because this would invalidate everything
else. */
bitmap_obstack_initialize (&problem_data->byte_lr_bitmaps);
problem_data->regno_start = XNEWVEC (unsigned int, max_reg);
problem_data->regno_len = XNEWVEC (unsigned int, max_reg);
bitmap_initialize (&problem_data->hardware_regs_used,
&problem_data->byte_lr_bitmaps);
bitmap_initialize (&problem_data->invalidated_by_call,
&problem_data->byte_lr_bitmaps);
bitmap_initialize (&problem_data->needs_expansion,
&problem_data->byte_lr_bitmaps);
bitmap_obstack_initialize (&problem_data->word_lr_bitmaps);
/* Discover which regno's use subregs, extracts or
strict_low_parts. */
FOR_EACH_BB (bb)
bitmap_set_bit (df_word_lr->out_of_date_transfer_functions, bb->index);
bitmap_set_bit (df_word_lr->out_of_date_transfer_functions, ENTRY_BLOCK);
bitmap_set_bit (df_word_lr->out_of_date_transfer_functions, EXIT_BLOCK);
EXECUTE_IF_SET_IN_BITMAP (df_word_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
rtx insn;
FOR_BB_INSNS (bb, insn)
{
if (INSN_P (insn))
{
struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
df_byte_lr_check_regs (DF_INSN_INFO_DEFS (insn_info));
df_byte_lr_check_regs (DF_INSN_INFO_USES (insn_info));
}
}
bitmap_set_bit (df_byte_lr->out_of_date_transfer_functions, bb->index);
}
bitmap_set_bit (df_byte_lr->out_of_date_transfer_functions, ENTRY_BLOCK);
bitmap_set_bit (df_byte_lr->out_of_date_transfer_functions, EXIT_BLOCK);
/* Allocate the slots for each regno. */
for (regno = 0; regno < max_reg; regno++)
{
int len;
problem_data->regno_start[regno] = index;
if (bitmap_bit_p (&problem_data->needs_expansion, regno))
len = GET_MODE_SIZE (GET_MODE (regno_reg_rtx[regno]));
else
len = 1;
problem_data->regno_len[regno] = len;
index += len;
}
df_byte_lr_expand_bitmap (&problem_data->hardware_regs_used,
&df->hardware_regs_used);
df_byte_lr_expand_bitmap (&problem_data->invalidated_by_call,
regs_invalidated_by_call_regset);
EXECUTE_IF_SET_IN_BITMAP (df_byte_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
/* When bitmaps are already initialized, just clear them. */
if (bb_info->use.obstack)
@ -2501,74 +2363,109 @@ df_byte_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
}
else
{
bitmap_initialize (&bb_info->use, &problem_data->byte_lr_bitmaps);
bitmap_initialize (&bb_info->def, &problem_data->byte_lr_bitmaps);
bitmap_initialize (&bb_info->in, &problem_data->byte_lr_bitmaps);
bitmap_initialize (&bb_info->out, &problem_data->byte_lr_bitmaps);
bitmap_initialize (&bb_info->use, &problem_data->word_lr_bitmaps);
bitmap_initialize (&bb_info->def, &problem_data->word_lr_bitmaps);
bitmap_initialize (&bb_info->in, &problem_data->word_lr_bitmaps);
bitmap_initialize (&bb_info->out, &problem_data->word_lr_bitmaps);
}
}
df_byte_lr->optional_p = true;
df_word_lr->optional_p = true;
}
/* Reset the global solution for recalculation. */
static void
df_byte_lr_reset (bitmap all_blocks)
df_word_lr_reset (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
gcc_assert (bb_info);
bitmap_clear (&bb_info->in);
bitmap_clear (&bb_info->out);
}
}
/* Examine REF, and if it is for a reg we're interested in, set or
clear the bits corresponding to its subwords from the bitmap
according to IS_SET. LIVE is the bitmap we should update. We do
not track hard regs or pseudos of any size other than 2 *
UNITS_PER_WORD.
We return true if we changed the bitmap, or if we encountered a register
we're not tracking. */
bool
df_word_lr_mark_ref (df_ref ref, bool is_set, regset live)
{
rtx orig_reg = DF_REF_REG (ref);
rtx reg = orig_reg;
enum machine_mode reg_mode;
unsigned regno;
/* Left at -1 for whole accesses. */
int which_subword = -1;
bool changed = false;
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (orig_reg);
regno = REGNO (reg);
reg_mode = GET_MODE (reg);
if (regno < FIRST_PSEUDO_REGISTER
|| GET_MODE_SIZE (reg_mode) != 2 * UNITS_PER_WORD)
return true;
if (GET_CODE (orig_reg) == SUBREG
&& df_read_modify_subreg_p (orig_reg))
{
gcc_assert (DF_REF_FLAGS_IS_SET (ref, DF_REF_PARTIAL));
if (subreg_lowpart_p (orig_reg))
which_subword = 0;
else
which_subword = 1;
}
if (is_set)
{
if (which_subword != 1)
changed |= bitmap_set_bit (live, regno * 2);
if (which_subword != 0)
changed |= bitmap_set_bit (live, regno * 2 + 1);
}
else
{
if (which_subword != 1)
changed |= bitmap_clear_bit (live, regno * 2);
if (which_subword != 0)
changed |= bitmap_clear_bit (live, regno * 2 + 1);
}
return changed;
}
/* Compute local live register info for basic block BB. */
static void
df_byte_lr_bb_local_compute (unsigned int bb_index)
df_word_lr_bb_local_compute (unsigned int bb_index)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
basic_block bb = BASIC_BLOCK (bb_index);
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
rtx insn;
df_ref *def_rec;
df_ref *use_rec;
/* Process the registers set in an exception handler. */
/* Ensure that artificial refs don't contain references to pseudos. */
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
{
unsigned int dregno = DF_REF_REGNO (def);
unsigned int start = problem_data->regno_start[dregno];
unsigned int len = problem_data->regno_len[dregno];
bitmap_set_range (&bb_info->def, start, len);
bitmap_clear_range (&bb_info->use, start, len);
}
gcc_assert (DF_REF_REGNO (def) < FIRST_PSEUDO_REGISTER);
}
/* Process the hardware registers that are always live. */
for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
{
df_ref use = *use_rec;
/* Add use to set of uses in this BB. */
if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
{
unsigned int uregno = DF_REF_REGNO (use);
unsigned int start = problem_data->regno_start[uregno];
unsigned int len = problem_data->regno_len[uregno];
bitmap_set_range (&bb_info->use, start, len);
}
gcc_assert (DF_REF_REGNO (use) < FIRST_PSEUDO_REGISTER);
}
FOR_BB_INSNS_REVERSE (bb, insn)
@ -2577,7 +2474,6 @@ df_byte_lr_bb_local_compute (unsigned int bb_index)
if (!INSN_P (insn))
continue;
for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
{
df_ref def = *def_rec;
@ -2585,164 +2481,80 @@ df_byte_lr_bb_local_compute (unsigned int bb_index)
not kill the other defs that reach here. */
if (!(DF_REF_FLAGS (def) & (DF_REF_CONDITIONAL)))
{
unsigned int dregno = DF_REF_REGNO (def);
unsigned int start = problem_data->regno_start[dregno];
unsigned int len = problem_data->regno_len[dregno];
unsigned int sb;
unsigned int lb;
if (!df_compute_accessed_bytes (def, DF_MM_MUST, &sb, &lb))
{
start += sb;
len = lb - sb;
}
if (len)
{
bitmap_set_range (&bb_info->def, start, len);
bitmap_clear_range (&bb_info->use, start, len);
}
df_word_lr_mark_ref (def, true, &bb_info->def);
df_word_lr_mark_ref (def, false, &bb_info->use);
}
}
for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
{
df_ref use = *use_rec;
unsigned int uregno = DF_REF_REGNO (use);
unsigned int start = problem_data->regno_start[uregno];
unsigned int len = problem_data->regno_len[uregno];
unsigned int sb;
unsigned int lb;
if (!df_compute_accessed_bytes (use, DF_MM_MAY, &sb, &lb))
{
start += sb;
len = lb - sb;
}
/* Add use to set of uses in this BB. */
if (len)
bitmap_set_range (&bb_info->use, start, len);
df_word_lr_mark_ref (use, true, &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 (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
{
unsigned int dregno = DF_REF_REGNO (def);
unsigned int start = problem_data->regno_start[dregno];
unsigned int len = problem_data->regno_len[dregno];
bitmap_set_range (&bb_info->def, start, len);
bitmap_clear_range (&bb_info->use, start, len);
}
}
#ifdef EH_USES
/* Process the uses that are live into an exception handler. */
for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
{
df_ref use = *use_rec;
/* Add use to set of uses in this BB. */
if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
{
unsigned int uregno = DF_REF_REGNO (use);
unsigned int start = problem_data->regno_start[uregno];
unsigned int len = problem_data->regno_len[uregno];
bitmap_set_range (&bb_info->use, start, len);
}
}
#endif
}
/* Compute local live register info for each basic block within BLOCKS. */
static void
df_byte_lr_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
df_word_lr_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (df_byte_lr->out_of_date_transfer_functions, 0, bb_index, bi)
EXECUTE_IF_SET_IN_BITMAP (df_word_lr->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. */
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (EXIT_BLOCK);
df_byte_lr_expand_bitmap (&bb_info->use, df->exit_block_uses);
unsigned regno;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (df->exit_block_uses, FIRST_PSEUDO_REGISTER,
regno, bi)
gcc_unreachable ();
}
else
df_byte_lr_bb_local_compute (bb_index);
df_word_lr_bb_local_compute (bb_index);
}
bitmap_clear (df_byte_lr->out_of_date_transfer_functions);
bitmap_clear (df_word_lr->out_of_date_transfer_functions);
}
/* Initialize the solution vectors. */
static void
df_byte_lr_init (bitmap all_blocks)
df_word_lr_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
bitmap_copy (&bb_info->in, &bb_info->use);
bitmap_clear (&bb_info->out);
}
}
/* 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_byte_lr_confluence_0 (basic_block bb)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
bitmap op1 = &df_byte_lr_get_bb_info (bb->index)->out;
if (bb != EXIT_BLOCK_PTR)
bitmap_copy (op1, &problem_data->hardware_regs_used);
}
/* Confluence function that ignores fake edges. */
static bool
df_byte_lr_confluence_n (edge e)
df_word_lr_confluence_n (edge e)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
bitmap op1 = &df_byte_lr_get_bb_info (e->src->index)->out;
bitmap op2 = &df_byte_lr_get_bb_info (e->dest->index)->in;
bool changed = false;
bitmap op1 = &df_word_lr_get_bb_info (e->src->index)->out;
bitmap op2 = &df_word_lr_get_bb_info (e->dest->index)->in;
/* Call-clobbered registers die across exception and call edges. */
/* ??? Abnormal call edges ignored for the moment, as this gets
confused by sibling call edges, which crashes reg-stack. */
if (e->flags & EDGE_EH)
changed = bitmap_ior_and_compl_into (op1, op2,
&problem_data->invalidated_by_call);
else
changed = bitmap_ior_into (op1, op2);
changed |= bitmap_ior_into (op1, &problem_data->hardware_regs_used);
return changed;
return bitmap_ior_into (op1, op2);
}
/* Transfer function. */
static bool
df_byte_lr_transfer_function (int bb_index)
df_word_lr_transfer_function (int bb_index)
{
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb_index);
bitmap in = &bb_info->in;
bitmap out = &bb_info->out;
bitmap use = &bb_info->use;
@ -2755,86 +2567,83 @@ df_byte_lr_transfer_function (int bb_index)
/* Free all storage associated with the problem. */
static void
df_byte_lr_free (void)
df_word_lr_free (void)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
struct df_word_lr_problem_data *problem_data
= (struct df_word_lr_problem_data *)df_word_lr->problem_data;
if (df_byte_lr->block_info)
if (df_word_lr->block_info)
{
df_byte_lr->block_info_size = 0;
free (df_byte_lr->block_info);
df_byte_lr->block_info = NULL;
df_word_lr->block_info_size = 0;
free (df_word_lr->block_info);
df_word_lr->block_info = NULL;
}
BITMAP_FREE (df_byte_lr->out_of_date_transfer_functions);
bitmap_obstack_release (&problem_data->byte_lr_bitmaps);
free (problem_data->regno_start);
free (problem_data->regno_len);
BITMAP_FREE (df_word_lr->out_of_date_transfer_functions);
bitmap_obstack_release (&problem_data->word_lr_bitmaps);
free (problem_data);
free (df_byte_lr);
free (df_word_lr);
}
/* Debugging info at top of bb. */
static void
df_byte_lr_top_dump (basic_block bb, FILE *file)
df_word_lr_top_dump (basic_block bb, FILE *file)
{
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb->index);
struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb->index);
if (!bb_info)
return;
fprintf (file, ";; blr in \t");
df_print_byte_regset (file, &bb_info->in);
df_print_word_regset (file, &bb_info->in);
fprintf (file, ";; blr use \t");
df_print_byte_regset (file, &bb_info->use);
df_print_word_regset (file, &bb_info->use);
fprintf (file, ";; blr def \t");
df_print_byte_regset (file, &bb_info->def);
df_print_word_regset (file, &bb_info->def);
}
/* Debugging info at bottom of bb. */
static void
df_byte_lr_bottom_dump (basic_block bb, FILE *file)
df_word_lr_bottom_dump (basic_block bb, FILE *file)
{
struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb->index);
struct df_word_lr_bb_info *bb_info = df_word_lr_get_bb_info (bb->index);
if (!bb_info)
return;
fprintf (file, ";; blr out \t");
df_print_byte_regset (file, &bb_info->out);
df_print_word_regset (file, &bb_info->out);
}
/* All of the information associated with every instance of the problem. */
static struct df_problem problem_BYTE_LR =
static struct df_problem problem_WORD_LR =
{
DF_BYTE_LR, /* Problem id. */
DF_WORD_LR, /* Problem id. */
DF_BACKWARD, /* Direction. */
df_byte_lr_alloc, /* Allocate the problem specific data. */
df_byte_lr_reset, /* Reset global information. */
df_byte_lr_free_bb_info, /* Free basic block info. */
df_byte_lr_local_compute, /* Local compute function. */
df_byte_lr_init, /* Init the solution specific data. */
df_word_lr_alloc, /* Allocate the problem specific data. */
df_word_lr_reset, /* Reset global information. */
df_word_lr_free_bb_info, /* Free basic block info. */
df_word_lr_local_compute, /* Local compute function. */
df_word_lr_init, /* Init the solution specific data. */
df_worklist_dataflow, /* Worklist solver. */
df_byte_lr_confluence_0, /* Confluence operator 0. */
df_byte_lr_confluence_n, /* Confluence operator n. */
df_byte_lr_transfer_function, /* Transfer function. */
NULL, /* Confluence operator 0. */
df_word_lr_confluence_n, /* Confluence operator n. */
df_word_lr_transfer_function, /* Transfer function. */
NULL, /* Finalize function. */
df_byte_lr_free, /* Free all of the problem information. */
df_byte_lr_free, /* Remove this problem from the stack of dataflow problems. */
df_word_lr_free, /* Free all of the problem information. */
df_word_lr_free, /* Remove this problem from the stack of dataflow problems. */
NULL, /* Debugging. */
df_byte_lr_top_dump, /* Debugging start block. */
df_byte_lr_bottom_dump, /* Debugging end block. */
df_word_lr_top_dump, /* Debugging start block. */
df_word_lr_bottom_dump, /* Debugging end block. */
NULL, /* Incremental solution verify start. */
NULL, /* Incremental solution verify end. */
NULL, /* Dependent problem. */
sizeof (struct df_byte_lr_bb_info),/* Size of entry of block_info array. */
TV_DF_BYTE_LR, /* Timing variable. */
sizeof (struct df_word_lr_bb_info),/* Size of entry of block_info array. */
TV_DF_WORD_LR, /* Timing variable. */
false /* Reset blocks on dropping out of blocks_to_analyze. */
};
@ -2844,163 +2653,50 @@ static struct df_problem problem_BYTE_LR =
solution. */
void
df_byte_lr_add_problem (void)
df_word_lr_add_problem (void)
{
df_add_problem (&problem_BYTE_LR);
df_add_problem (&problem_WORD_LR);
/* These will be initialized when df_scan_blocks processes each
block. */
df_byte_lr->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
df_word_lr->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
/* Simulate the effects of the defs of INSN on LIVE. */
/* Simulate the effects of the defs of INSN on LIVE. Return true if we changed
any bits, which is used by the caller to determine whether a set is
necessary. We also return true if there are other reasons not to delete
an insn. */
void
df_byte_lr_simulate_defs (rtx insn, bitmap live)
bool
df_word_lr_simulate_defs (rtx insn, bitmap live)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
bool changed = false;
df_ref *def_rec;
unsigned int uid = INSN_UID (insn);
for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
{
df_ref def = *def_rec;
/* If the def is to only part of the reg, it does
not kill the other defs that reach here. */
if (!(DF_REF_FLAGS (def) & DF_REF_CONDITIONAL))
{
unsigned int dregno = DF_REF_REGNO (def);
unsigned int start = problem_data->regno_start[dregno];
unsigned int len = problem_data->regno_len[dregno];
unsigned int sb;
unsigned int lb;
if (!df_compute_accessed_bytes (def, DF_MM_MUST, &sb, &lb))
{
start += sb;
len = lb - sb;
}
if (len)
bitmap_clear_range (live, start, len);
}
if (DF_REF_FLAGS (def) & DF_REF_CONDITIONAL)
changed = true;
else
changed |= df_word_lr_mark_ref (*def_rec, false, live);
}
return changed;
}
/* Simulate the effects of the uses of INSN on LIVE. */
void
df_byte_lr_simulate_uses (rtx insn, bitmap live)
df_word_lr_simulate_uses (rtx insn, bitmap live)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
df_ref *use_rec;
unsigned int uid = INSN_UID (insn);
for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
{
df_ref use = *use_rec;
unsigned int uregno = DF_REF_REGNO (use);
unsigned int start = problem_data->regno_start[uregno];
unsigned int len = problem_data->regno_len[uregno];
unsigned int sb;
unsigned int lb;
if (!df_compute_accessed_bytes (use, DF_MM_MAY, &sb, &lb))
{
start += sb;
len = lb - sb;
}
/* Add use to set of uses in this BB. */
if (len)
bitmap_set_range (live, start, len);
}
df_word_lr_mark_ref (*use_rec, true, live);
}
/* Apply the artificial uses and defs at the top of BB in a forwards
direction. */
void
df_byte_lr_simulate_artificial_refs_at_top (basic_block bb, bitmap live)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
df_ref *def_rec;
#ifdef EH_USES
df_ref *use_rec;
#endif
int bb_index = bb->index;
#ifdef EH_USES
for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
{
df_ref use = *use_rec;
if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
{
unsigned int uregno = DF_REF_REGNO (use);
unsigned int start = problem_data->regno_start[uregno];
unsigned int len = problem_data->regno_len[uregno];
bitmap_set_range (live, start, len);
}
}
#endif
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
{
unsigned int dregno = DF_REF_REGNO (def);
unsigned int start = problem_data->regno_start[dregno];
unsigned int len = problem_data->regno_len[dregno];
bitmap_clear_range (live, start, len);
}
}
}
/* Apply the artificial uses and defs at the end of BB in a backwards
direction. */
void
df_byte_lr_simulate_artificial_refs_at_end (basic_block bb, bitmap live)
{
struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
df_ref *def_rec;
df_ref *use_rec;
int bb_index = bb->index;
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
{
unsigned int dregno = DF_REF_REGNO (def);
unsigned int start = problem_data->regno_start[dregno];
unsigned int len = problem_data->regno_len[dregno];
bitmap_clear_range (live, start, len);
}
}
for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
{
df_ref use = *use_rec;
if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
{
unsigned int uregno = DF_REF_REGNO (use);
unsigned int start = problem_data->regno_start[uregno];
unsigned int len = problem_data->regno_len[uregno];
bitmap_set_range (live, start, len);
}
}
}
/*----------------------------------------------------------------------------
This problem computes REG_DEAD and REG_UNUSED notes.

52
gcc/df.h
View File

@ -52,7 +52,7 @@ union df_ref_d;
#define DF_LIVE 2 /* Live Registers & Uninitialized Registers */
#define DF_RD 3 /* Reaching Defs. */
#define DF_CHAIN 4 /* Def-Use and/or Use-Def Chains. */
#define DF_BYTE_LR 5 /* Subreg tracking lr. */
#define DF_WORD_LR 5 /* Subreg tracking lr. */
#define DF_NOTE 6 /* REG_DEF and REG_UNUSED notes. */
#define DF_MD 7 /* Multiple Definitions. */
@ -66,14 +66,6 @@ enum df_flow_dir
DF_BACKWARD
};
/* Used in the byte scanning to determine if may or must info is to be
returned. */
enum df_mm
{
DF_MM_MAY,
DF_MM_MUST
};
/* Descriminator for the various df_ref types. */
enum df_ref_class {DF_REF_BASE, DF_REF_ARTIFICIAL, DF_REF_REGULAR, DF_REF_EXTRACT};
@ -624,7 +616,7 @@ struct df_d
#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_BB_INFO(BB) (df_live_get_bb_info((BB)->index))
#define DF_BYTE_LR_BB_INFO(BB) (df_byte_lr_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))
/* Most transformations that wish to use live register analysis will
@ -641,8 +633,8 @@ struct df_d
/* These macros are used by passes that are not tolerant of
uninitialized variables. This intolerance should eventually
be fixed. */
#define DF_BYTE_LR_IN(BB) (&DF_BYTE_LR_BB_INFO(BB)->in)
#define DF_BYTE_LR_OUT(BB) (&DF_BYTE_LR_BB_INFO(BB)->out)
#define DF_WORD_LR_IN(BB) (&DF_WORD_LR_BB_INFO(BB)->in)
#define DF_WORD_LR_OUT(BB) (&DF_WORD_LR_BB_INFO(BB)->out)
/* Macros to access the elements within the ref structure. */
@ -859,9 +851,11 @@ struct df_live_bb_info
/* Live registers, a backwards dataflow problem. These bitmaps are
indexed by the df_byte_lr_offset array which is indexed by pseudo. */
indexed by 2 * regno for each pseudo and have two entries for each
pseudo. Only pseudos that have a size of 2 * UNITS_PER_WORD are
meaningfully tracked. */
struct df_byte_lr_bb_info
struct df_word_lr_bb_info
{
/* Local sets to describe the basic blocks. */
bitmap_head def; /* The set of registers set in this block
@ -883,7 +877,7 @@ extern struct df_d *df;
#define df_lr (df->problems_by_index[DF_LR])
#define df_live (df->problems_by_index[DF_LIVE])
#define df_chain (df->problems_by_index[DF_CHAIN])
#define df_byte_lr (df->problems_by_index[DF_BYTE_LR])
#define df_word_lr (df->problems_by_index[DF_WORD_LR])
#define df_note (df->problems_by_index[DF_NOTE])
#define df_md (df->problems_by_index[DF_MD])
@ -933,7 +927,7 @@ extern df_ref df_find_use (rtx, rtx);
extern bool df_reg_used (rtx, rtx);
extern void df_worklist_dataflow (struct dataflow *,bitmap, int *, int);
extern void df_print_regset (FILE *file, bitmap r);
extern void df_print_byte_regset (FILE *file, bitmap r);
extern void df_print_word_regset (FILE *file, bitmap r);
extern void df_dump (FILE *);
extern void df_dump_region (FILE *);
extern void df_dump_start (FILE *);
@ -972,13 +966,12 @@ extern void df_live_verify_transfer_functions (void);
extern void df_live_add_problem (void);
extern void df_live_set_all_dirty (void);
extern void df_chain_add_problem (unsigned int);
extern void df_byte_lr_add_problem (void);
extern int df_byte_lr_get_regno_start (unsigned int);
extern int df_byte_lr_get_regno_len (unsigned int);
extern void df_byte_lr_simulate_defs (rtx, bitmap);
extern void df_byte_lr_simulate_uses (rtx, bitmap);
extern void df_byte_lr_simulate_artificial_refs_at_top (basic_block, bitmap);
extern void df_byte_lr_simulate_artificial_refs_at_end (basic_block, bitmap);
extern void df_word_lr_add_problem (void);
extern bool df_word_lr_mark_ref (df_ref, bool, bitmap);
extern bool df_word_lr_simulate_defs (rtx, bitmap);
extern void df_word_lr_simulate_uses (rtx, bitmap);
extern void df_word_lr_simulate_artificial_refs_at_top (basic_block, bitmap);
extern void df_word_lr_simulate_artificial_refs_at_end (basic_block, bitmap);
extern void df_note_add_problem (void);
extern void df_md_add_problem (void);
extern void df_md_simulate_artificial_defs_at_top (basic_block, bitmap);
@ -1029,11 +1022,6 @@ extern void df_compute_regs_ever_live (bool);
extern bool df_read_modify_subreg_p (rtx);
extern void df_scan_verify (void);
/* Functions defined in df-byte-scan.c. */
extern bool df_compute_accessed_bytes (df_ref, enum df_mm,
unsigned int *, unsigned int *);
/* Get basic block info. */
static inline struct df_scan_bb_info *
@ -1081,11 +1069,11 @@ df_live_get_bb_info (unsigned int index)
return NULL;
}
static inline struct df_byte_lr_bb_info *
df_byte_lr_get_bb_info (unsigned int index)
static inline struct df_word_lr_bb_info *
df_word_lr_get_bb_info (unsigned int index)
{
if (index < df_byte_lr->block_info_size)
return &((struct df_byte_lr_bb_info *) df_byte_lr->block_info)[index];
if (index < df_word_lr->block_info_size)
return &((struct df_word_lr_bb_info *) df_word_lr->block_info)[index];
else
return NULL;
}

4
gcc/lower-subreg.c
View File

@ -33,6 +33,7 @@ along with GCC; see the file COPYING3. If not see
#include "basic-block.h"
#include "recog.h"
#include "bitmap.h"
#include "dce.h"
#include "expr.h"
#include "except.h"
#include "regs.h"
@ -1091,6 +1092,9 @@ decompose_multiword_subregs (void)
return;
}
if (df)
run_word_dce ();
/* FIXME: When the dataflow branch is merged, we can change this
code to look for each multi-word pseudo-register and to find each
insn which sets or uses that register. That should be faster

2
gcc/timevar.def
View File

@ -91,7 +91,7 @@ DEFTIMEVAR (TV_DF_LR , "df live regs")
DEFTIMEVAR (TV_DF_LIVE , "df live&initialized regs")
DEFTIMEVAR (TV_DF_UREC , "df uninitialized regs 2")
DEFTIMEVAR (TV_DF_CHAIN , "df use-def / def-use chains")
DEFTIMEVAR (TV_DF_BYTE_LR , "df live byte regs")
DEFTIMEVAR (TV_DF_WORD_LR , "df live reg subwords")
DEFTIMEVAR (TV_DF_NOTE , "df reg dead/unused notes")
DEFTIMEVAR (TV_REG_STATS , "register information")