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invoke.texi (max-stores-to-sink): Document.

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* doc/invoke.texi (max-stores-to-sink): Document.
        * params.h (MAX_STORES_TO_SINK): Define.
        * opts.c (finish_options): Set MAX_STORES_TO_SINK to 0
        if either vectorization or if-conversion is disabled.
        * tree-data-ref.c (dr_equal_offsets_p1): Moved and renamed from
        tree-vect-data-refs.c vect_equal_offsets.
        (dr_equal_offsets_p): New function.
        (find_data_references_in_bb): Remove static.
        * tree-data-ref.h (find_data_references_in_bb): Declare.
        (dr_equal_offsets_p): Likewise.
        * tree-vect-data-refs.c (vect_equal_offsets): Move to
        tree-data-ref.c.
        (vect_drs_dependent_in_basic_block): Update calls to
        vect_equal_offsets.
        (vect_check_interleaving): Likewise.
        * tree-ssa-phiopt.c: Include cfgloop.h and tree-data-ref.h.
        (cond_if_else_store_replacement): Rename to...
        (cond_if_else_store_replacement_1): ... this.  Change arguments
        and documentation.
        (cond_if_else_store_replacement): New function.
        * Makefile.in (tree-ssa-phiopt.o): Adjust dependencies.
        * params.def (PARAM_MAX_STORES_TO_SINK): Define.

From-SVN: r171381
This commit is contained in:
Ira Rosen 2011-03-24 08:23:39 +00:00 committed by Ira Rosen
parent 3137991dfc
commit bfe068c3d3
13 changed files with 437 additions and 58 deletions
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24
gcc/ChangeLog
View File

@ -1,3 +1,27 @@
2011-03-24 Ira Rosen <ira.rosen@linaro.org>
* doc/invoke.texi (max-stores-to-sink): Document.
* params.h (MAX_STORES_TO_SINK): Define.
* opts.c (finish_options): Set MAX_STORES_TO_SINK to 0
if either vectorization or if-conversion is disabled.
* tree-data-ref.c (dr_equal_offsets_p1): Moved and renamed from
tree-vect-data-refs.c vect_equal_offsets.
(dr_equal_offsets_p): New function.
(find_data_references_in_bb): Remove static.
* tree-data-ref.h (find_data_references_in_bb): Declare.
(dr_equal_offsets_p): Likewise.
* tree-vect-data-refs.c (vect_equal_offsets): Move to tree-data-ref.c.
(vect_drs_dependent_in_basic_block): Update calls to
vect_equal_offsets.
(vect_check_interleaving): Likewise.
* tree-ssa-phiopt.c: Include cfgloop.h and tree-data-ref.h.
(cond_if_else_store_replacement): Rename to...
(cond_if_else_store_replacement_1): ... this. Change arguments and
documentation.
(cond_if_else_store_replacement): New function.
* Makefile.in (tree-ssa-phiopt.o): Adjust dependencies.
* params.def (PARAM_MAX_STORES_TO_SINK): Define.
2011-03-23 Chung-Lin Tang <cltang@codesourcery.com>
PR target/46934

3
gcc/Makefile.in
View File

@ -2419,7 +2419,8 @@ tree-ssa-ifcombine.o : tree-ssa-ifcombine.c $(CONFIG_H) $(SYSTEM_H) \
tree-ssa-phiopt.o : tree-ssa-phiopt.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
$(TM_H) $(GGC_H) $(TREE_H) $(TM_P_H) $(BASIC_BLOCK_H) \
$(TREE_FLOW_H) $(TREE_PASS_H) $(TREE_DUMP_H) langhooks.h $(FLAGS_H) \
$(DIAGNOSTIC_H) $(TIMEVAR_H) pointer-set.h domwalk.h
$(DIAGNOSTIC_H) $(TIMEVAR_H) pointer-set.h domwalk.h $(CFGLOOP_H) \
$(TREE_DATA_REF_H)
tree-nrv.o : tree-nrv.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
$(TM_H) $(TREE_H) $(FUNCTION_H) $(BASIC_BLOCK_H) $(FLAGS_H) \
$(DIAGNOSTIC_H) $(TREE_FLOW_H) $(TIMEVAR_H) $(TREE_DUMP_H) $(TREE_PASS_H) \

5
gcc/doc/invoke.texi
View File

@ -8868,6 +8868,11 @@ partitions.
The maximum number of namespaces to consult for suggestions when C++
name lookup fails for an identifier. The default is 1000.
@item max-stores-to-sink
The maximum number of conditional stores paires that can be sunk. Set to 0
if either vectorization (@option{-ftree-vectorize}) or if-conversion
(@option{-ftree-loop-if-convert}) is disabled. The default is 2.
@end table
@end table

6
gcc/opts.c
View File

@ -814,6 +814,12 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
opts->x_flag_split_stack = 0;
}
}
/* Set PARAM_MAX_STORES_TO_SINK to 0 if either vectorization or if-conversion
is disabled. */
if (!opts->x_flag_tree_vectorize || !opts->x_flag_tree_loop_if_convert)
maybe_set_param_value (PARAM_MAX_STORES_TO_SINK, 0,
opts->x_param_values, opts_set->x_param_values);
}
#define LEFT_COLUMN 27

7
gcc/params.def
View File

@ -873,6 +873,13 @@ DEFPARAM (CXX_MAX_NAMESPACES_FOR_DIAGNOSTIC_HELP,
"name lookup fails",
1000, 0, 0)
/* Maximum number of conditional store pairs that can be sunk. */
DEFPARAM (PARAM_MAX_STORES_TO_SINK,
"max-stores-to-sink",
"Maximum number of conditional store pairs that can be sunk",
2, 0, 0)
/*
Local variables:
mode:c

2
gcc/params.h
View File

@ -204,4 +204,6 @@ extern void init_param_values (int *params);
PARAM_VALUE (PARAM_PREFETCH_MIN_INSN_TO_MEM_RATIO)
#define MIN_NONDEBUG_INSN_UID \
PARAM_VALUE (PARAM_MIN_NONDEBUG_INSN_UID)
#define MAX_STORES_TO_SINK \
PARAM_VALUE (PARAM_MAX_STORES_TO_SINK)
#endif /* ! GCC_PARAMS_H */

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2011-03-24 Ira Rosen <ira.rosen@linaro.org>
* gcc.dg/vect/vect-cselim-1.c: New test.
* gcc.dg/vect/vect-cselim-2.c: New test.
2011-03-23 Chung-Lin Tang <cltang@codesourcery.com>
* gcc.target/arm/pr46934.c: New.

86
gcc/testsuite/gcc.dg/vect/vect-cselim-1.c Normal file
View File

@ -0,0 +1,86 @@
/* { dg-require-effective-target vect_int } */
#include <stdarg.h>
#include "tree-vect.h"
#define N 50
typedef struct {
short a;
short b;
} data;
data in1[N], in2[N], out[N];
short result[N*2] = {7,-7,9,-6,11,-5,13,-4,15,-3,17,-2,19,-1,21,0,23,1,25,2,27,3,29,4,31,5,33,6,35,7,37,8,39,9,41,10,43,11,45,12,47,13,49,14,51,15,53,16,55,17,57,18,59,19,61,20,63,21,65,22,67,23,69,24,71,25,73,26,75,27,77,28,79,29,81,30,83,31,85,32,87,33,89,34,91,35,93,36,95,37,97,38,99,39,101,40,103,41,105,42};
short out1[N], out2[N];
__attribute__ ((noinline)) void
foo ()
{
int i;
short c, d;
/* Vectorizable with conditional store sinking. */
for (i = 0; i < N; i++)
{
c = in1[i].b;
d = in2[i].b;
if (c >= d)
{
out[i].b = c;
out[i].a = d + 5;
}
else
{
out[i].b = d - 12;
out[i].a = c + d;
}
}
/* Not vectorizable. */
for (i = 0; i < N; i++)
{
c = in1[i].b;
d = in2[i].b;
if (c >= d)
{
out1[i] = c;
}
else
{
out2[i] = c + d;
}
}
}
int
main (void)
{
int i;
check_vect ();
for (i = 0; i < N; i++)
{
in1[i].a = i;
in1[i].b = i + 2;
in2[i].a = 5;
in2[i].b = i + 5;
__asm__ volatile ("");
}
foo ();
for (i = 0; i < N; i++)
{
if (out[i].a != result[2*i] || out[i].b != result[2*i+1])
abort ();
}
return 0;
}
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */
/* { dg-final { cleanup-tree-dump "vect" } } */

65
gcc/testsuite/gcc.dg/vect/vect-cselim-2.c Normal file
View File

@ -0,0 +1,65 @@
/* { dg-require-effective-target vect_int } */
#include <stdarg.h>
#include "tree-vect.h"
#define N 50
int a[N], b[N], in1[N], in2[N];
int result[2*N] = {5,-7,7,-6,9,-5,11,-4,13,-3,15,-2,17,-1,19,0,21,1,23,2,25,3,27,4,29,5,31,6,33,7,35,8,37,9,39,10,41,11,43,12,45,13,47,14,49,15,51,16,53,17,55,18,57,19,59,20,61,21,63,22,65,23,67,24,69,25,71,26,73,27,75,28,77,29,79,30,81,31,83,32,85,33,87,34,89,35,91,36,93,37,95,38,97,39,99,40,101,41,103,42};
__attribute__ ((noinline)) void
foo (int *pa, int *pb)
{
int i;
int c, d;
/* Store sinking should not work here since the pointers may alias. */
for (i = 0; i < N; i++)
{
c = in1[i];
d = in2[i];
if (c >= d)
{
*pa = c;
*pb = d + 5;
}
else
{
*pb = d - 12;
*pa = c + d;
}
pa++;
pb++;
}
}
int
main (void)
{
int i;
check_vect ();
for (i = 0; i < N; i++)
{
in1[i] = i;
in2[i] = i + 5;
__asm__ volatile ("");
}
foo (a, b);
for (i = 0; i < N; i++)
{
if (a[i] != result[2*i] || b[i] != result[2*i+1])
abort ();
}
return 0;
}
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 0 "vect" } } */
/* { dg-final { cleanup-tree-dump "vect" } } */

44
gcc/tree-data-ref.c
View File

@ -991,6 +991,48 @@ create_data_ref (loop_p nest, loop_p loop, tree memref, gimple stmt,
return dr;
}
/* Check if OFFSET1 and OFFSET2 (DR_OFFSETs of some data-refs) are identical
expressions. */
static bool
dr_equal_offsets_p1 (tree offset1, tree offset2)
{
bool res;
STRIP_NOPS (offset1);
STRIP_NOPS (offset2);
if (offset1 == offset2)
return true;
if (TREE_CODE (offset1) != TREE_CODE (offset2)
|| (!BINARY_CLASS_P (offset1) && !UNARY_CLASS_P (offset1)))
return false;
res = dr_equal_offsets_p1 (TREE_OPERAND (offset1, 0),
TREE_OPERAND (offset2, 0));
if (!res || !BINARY_CLASS_P (offset1))
return res;
res = dr_equal_offsets_p1 (TREE_OPERAND (offset1, 1),
TREE_OPERAND (offset2, 1));
return res;
}
/* Check if DRA and DRB have equal offsets. */
bool
dr_equal_offsets_p (struct data_reference *dra,
struct data_reference *drb)
{
tree offset1, offset2;
offset1 = DR_OFFSET (dra);
offset2 = DR_OFFSET (drb);
return dr_equal_offsets_p1 (offset1, offset2);
}
/* Returns true if FNA == FNB. */
static bool
@ -4294,7 +4336,7 @@ graphite_find_data_references_in_stmt (loop_p nest, loop_p loop, gimple stmt,
DATAREFS. Returns chrec_dont_know when failing to analyze a
difficult case, returns NULL_TREE otherwise. */
static tree
tree
find_data_references_in_bb (struct loop *loop, basic_block bb,
VEC (data_reference_p, heap) **datarefs)
{

4
gcc/tree-data-ref.h
View File

@ -426,10 +426,14 @@ extern bool find_loop_nest (struct loop *, VEC (loop_p, heap) **);
extern void compute_all_dependences (VEC (data_reference_p, heap) *,
VEC (ddr_p, heap) **, VEC (loop_p, heap) *,
bool);
extern tree find_data_references_in_bb (struct loop *, basic_block,
VEC (data_reference_p, heap) **);
extern void create_rdg_vertices (struct graph *, VEC (gimple, heap) *);
extern bool dr_may_alias_p (const struct data_reference *,
const struct data_reference *);
extern bool dr_equal_offsets_p (struct data_reference *,
struct data_reference *);
/* Return true when the base objects of data references A and B are

207
gcc/tree-ssa-phiopt.c
View File

@ -34,6 +34,8 @@ along with GCC; see the file COPYING3. If not see
#include "langhooks.h"
#include "pointer-set.h"
#include "domwalk.h"
#include "cfgloop.h"
#include "tree-data-ref.h"
static unsigned int tree_ssa_phiopt (void);
static unsigned int tree_ssa_phiopt_worker (bool);
@ -1304,35 +1306,18 @@ cond_store_replacement (basic_block middle_bb, basic_block join_bb,
return true;
}
/* Do the main work of conditional store replacement. We already know
that the recognized pattern looks like so:
split:
if (cond) goto THEN_BB; else goto ELSE_BB (edge E1)
THEN_BB:
X = Y;
goto JOIN_BB;
ELSE_BB:
X = Z;
fallthrough (edge E0)
JOIN_BB:
some more
We check that THEN_BB and ELSE_BB contain only one store
that the stores have a "simple" RHS. */
/* Do the main work of conditional store replacement. */
static bool
cond_if_else_store_replacement (basic_block then_bb, basic_block else_bb,
basic_block join_bb)
cond_if_else_store_replacement_1 (basic_block then_bb, basic_block else_bb,
basic_block join_bb, gimple then_assign,
gimple else_assign)
{
gimple then_assign = last_and_only_stmt (then_bb);
gimple else_assign = last_and_only_stmt (else_bb);
tree lhs_base, lhs, then_rhs, else_rhs;
source_location then_locus, else_locus;
gimple_stmt_iterator gsi;
gimple newphi, new_stmt;
/* Check if then_bb and else_bb contain only one store each. */
if (then_assign == NULL
|| !gimple_assign_single_p (then_assign)
|| else_assign == NULL
@ -1397,6 +1382,186 @@ cond_if_else_store_replacement (basic_block then_bb, basic_block else_bb,
return true;
}
/* Conditional store replacement. We already know
that the recognized pattern looks like so:
split:
if (cond) goto THEN_BB; else goto ELSE_BB (edge E1)
THEN_BB:
...
X = Y;
...
goto JOIN_BB;
ELSE_BB:
...
X = Z;
...
fallthrough (edge E0)
JOIN_BB:
some more
We check that it is safe to sink the store to JOIN_BB by verifying that
there are no read-after-write or write-after-write dependencies in
THEN_BB and ELSE_BB. */
static bool
cond_if_else_store_replacement (basic_block then_bb, basic_block else_bb,
basic_block join_bb)
{
gimple then_assign = last_and_only_stmt (then_bb);
gimple else_assign = last_and_only_stmt (else_bb);
VEC (data_reference_p, heap) *then_datarefs, *else_datarefs;
VEC (ddr_p, heap) *then_ddrs, *else_ddrs;
gimple then_store, else_store;
bool found, ok = false, res;
struct data_dependence_relation *ddr;
data_reference_p then_dr, else_dr;
int i, j;
tree then_lhs, else_lhs;
VEC (gimple, heap) *then_stores, *else_stores;
basic_block blocks[3];
if (MAX_STORES_TO_SINK == 0)
return false;
/* Handle the case with single statement in THEN_BB and ELSE_BB. */
if (then_assign && else_assign)
return cond_if_else_store_replacement_1 (then_bb, else_bb, join_bb,
then_assign, else_assign);
/* Find data references. */
then_datarefs = VEC_alloc (data_reference_p, heap, 1);
else_datarefs = VEC_alloc (data_reference_p, heap, 1);
if ((find_data_references_in_bb (NULL, then_bb, &then_datarefs)
== chrec_dont_know)
|| !VEC_length (data_reference_p, then_datarefs)
|| (find_data_references_in_bb (NULL, else_bb, &else_datarefs)
== chrec_dont_know)
|| !VEC_length (data_reference_p, else_datarefs))
{
free_data_refs (then_datarefs);
free_data_refs (else_datarefs);
return false;
}
/* Find pairs of stores with equal LHS. */
then_stores = VEC_alloc (gimple, heap, 1);
else_stores = VEC_alloc (gimple, heap, 1);
FOR_EACH_VEC_ELT (data_reference_p, then_datarefs, i, then_dr)
{
if (DR_IS_READ (then_dr))
continue;
then_store = DR_STMT (then_dr);
then_lhs = gimple_assign_lhs (then_store);
found = false;
FOR_EACH_VEC_ELT (data_reference_p, else_datarefs, j, else_dr)
{
if (DR_IS_READ (else_dr))
continue;
else_store = DR_STMT (else_dr);
else_lhs = gimple_assign_lhs (else_store);
if (operand_equal_p (then_lhs, else_lhs, 0))
{
found = true;
break;
}
}
if (!found)
continue;
VEC_safe_push (gimple, heap, then_stores, then_store);
VEC_safe_push (gimple, heap, else_stores, else_store);
}
/* No pairs of stores found. */
if (!VEC_length (gimple, then_stores)
|| VEC_length (gimple, then_stores) > (unsigned) MAX_STORES_TO_SINK)
{
free_data_refs (then_datarefs);
free_data_refs (else_datarefs);
VEC_free (gimple, heap, then_stores);
VEC_free (gimple, heap, else_stores);
return false;
}
/* Compute and check data dependencies in both basic blocks. */
then_ddrs = VEC_alloc (ddr_p, heap, 1);
else_ddrs = VEC_alloc (ddr_p, heap, 1);
compute_all_dependences (then_datarefs, &then_ddrs, NULL, false);
compute_all_dependences (else_datarefs, &else_ddrs, NULL, false);
free_data_refs (then_datarefs);
free_data_refs (else_datarefs);
blocks[0] = then_bb;
blocks[1] = else_bb;
blocks[2] = join_bb;
renumber_gimple_stmt_uids_in_blocks (blocks, 3);
/* Check that there are no read-after-write or write-after-write dependencies
in THEN_BB. */
FOR_EACH_VEC_ELT (ddr_p, then_ddrs, i, ddr)
{
struct data_reference *dra = DDR_A (ddr);
struct data_reference *drb = DDR_B (ddr);
if (DDR_ARE_DEPENDENT (ddr) != chrec_known
&& ((DR_IS_READ (dra) && DR_IS_WRITE (drb)
&& gimple_uid (DR_STMT (dra)) > gimple_uid (DR_STMT (drb)))
|| (DR_IS_READ (drb) && DR_IS_WRITE (dra)
&& gimple_uid (DR_STMT (drb)) > gimple_uid (DR_STMT (dra)))
|| (DR_IS_WRITE (dra) && DR_IS_WRITE (drb))))
{
free_dependence_relations (then_ddrs);
free_dependence_relations (else_ddrs);
VEC_free (gimple, heap, then_stores);
VEC_free (gimple, heap, else_stores);
return false;
}
}
/* Check that there are no read-after-write or write-after-write dependencies
in ELSE_BB. */
FOR_EACH_VEC_ELT (ddr_p, else_ddrs, i, ddr)
{
struct data_reference *dra = DDR_A (ddr);
struct data_reference *drb = DDR_B (ddr);
if (DDR_ARE_DEPENDENT (ddr) != chrec_known
&& ((DR_IS_READ (dra) && DR_IS_WRITE (drb)
&& gimple_uid (DR_STMT (dra)) > gimple_uid (DR_STMT (drb)))
|| (DR_IS_READ (drb) && DR_IS_WRITE (dra)
&& gimple_uid (DR_STMT (drb)) > gimple_uid (DR_STMT (dra)))
|| (DR_IS_WRITE (dra) && DR_IS_WRITE (drb))))
{
free_dependence_relations (then_ddrs);
free_dependence_relations (else_ddrs);
VEC_free (gimple, heap, then_stores);
VEC_free (gimple, heap, else_stores);
return false;
}
}
/* Sink stores with same LHS. */
FOR_EACH_VEC_ELT (gimple, then_stores, i, then_store)
{
else_store = VEC_index (gimple, else_stores, i);
res = cond_if_else_store_replacement_1 (then_bb, else_bb, join_bb,
then_store, else_store);
ok = ok || res;
}
free_dependence_relations (then_ddrs);
free_dependence_relations (else_ddrs);
VEC_free (gimple, heap, then_stores);
VEC_free (gimple, heap, else_stores);
return ok;
}
/* Always do these optimizations if we have SSA
trees to work on. */
static bool

37
gcc/tree-vect-data-refs.c
View File

@ -289,39 +289,6 @@ vect_update_interleaving_chain (struct data_reference *drb,
}
}
/* Function vect_equal_offsets.
Check if OFFSET1 and OFFSET2 are identical expressions. */
static bool
vect_equal_offsets (tree offset1, tree offset2)
{
bool res;
STRIP_NOPS (offset1);
STRIP_NOPS (offset2);
if (offset1 == offset2)
return true;
if (TREE_CODE (offset1) != TREE_CODE (offset2)
|| (!BINARY_CLASS_P (offset1) && !UNARY_CLASS_P (offset1)))
return false;
res = vect_equal_offsets (TREE_OPERAND (offset1, 0),
TREE_OPERAND (offset2, 0));
if (!res || !BINARY_CLASS_P (offset1))
return res;
res = vect_equal_offsets (TREE_OPERAND (offset1, 1),
TREE_OPERAND (offset2, 1));
return res;
}
/* Check dependence between DRA and DRB for basic block vectorization.
If the accesses share same bases and offsets, we can compare their initial
constant offsets to decide whether they differ or not. In case of a read-
@ -352,7 +319,7 @@ vect_drs_dependent_in_basic_block (struct data_reference *dra,
|| TREE_CODE (DR_BASE_ADDRESS (drb)) != ADDR_EXPR
|| TREE_OPERAND (DR_BASE_ADDRESS (dra), 0)
!= TREE_OPERAND (DR_BASE_ADDRESS (drb),0)))
|| !vect_equal_offsets (DR_OFFSET (dra), DR_OFFSET (drb)))
|| !dr_equal_offsets_p (dra, drb))
return true;
/* Check the types. */
@ -402,7 +369,7 @@ vect_check_interleaving (struct data_reference *dra,
|| TREE_CODE (DR_BASE_ADDRESS (drb)) != ADDR_EXPR
|| TREE_OPERAND (DR_BASE_ADDRESS (dra), 0)
!= TREE_OPERAND (DR_BASE_ADDRESS (drb),0)))
|| !vect_equal_offsets (DR_OFFSET (dra), DR_OFFSET (drb))
|| !dr_equal_offsets_p (dra, drb)
|| !tree_int_cst_compare (DR_INIT (dra), DR_INIT (drb))
|| DR_IS_READ (dra) != DR_IS_READ (drb))
return false;