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cselib.h (cselib_add_permanent_equiv): Declare. 

* cselib.h (cselib_add_permanent_equiv): Declare.
(canonical_cselib_val): New.
* cselib.c (new_elt_loc_list): Rework to support value
equivalences.  Adjust all callers.
(preserve_only_constants): Retain value equivalences.
(references_value_p): Retain preserved values.
(rtx_equal_for_cselib_1): Handle value equivalences.
(cselib_invalidate_regno): Use canonical value.
(cselib_add_permanent_equiv): New.
* alias.c (find_base_term): Reset locs lists while recursing.
* var-tracking.c (val_bind): New.  Don't add equivalences
present in cselib table, compared with code moved from...
(val_store): ... here.
(val_resolve): Use val_bind.
(VAL_EXPR_HAS_REVERSE): Drop.
(add_uses): Do not create MOps for addresses.  Do not mark
non-REG non-MEM expressions as requiring resolution.
(reverse_op): Record reverse as a cselib equivalence.
(add_stores): Use it.  Do not create MOps for addresses.
Do not require resolution for non-REG non-MEM expressions.
Simplify support for reverse operations.
(compute_bb_dataflow): Drop reverse support.
(emit_notes_in_bb): Likewise.
(create_entry_value): Rename to...
(record_entry_value): ... this.  Use cselib equivalences.
(vt_add_function_parameter): Adjust.

From-SVN: r182760
This commit is contained in:
Alexandre Oliva 2011-12-31 20:02:48 +00:00 committed by Alexandre Oliva
parent 32210fd616
commit 6f2ffb4b99
5 changed files with 290 additions and 210 deletions
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29
gcc/ChangeLog
View File

@ -1,3 +1,32 @@
2011-12-31 Alexandre Oliva <aoliva@redhat.com>
* cselib.h (cselib_add_permanent_equiv): Declare.
(canonical_cselib_val): New.
* cselib.c (new_elt_loc_list): Rework to support value
equivalences. Adjust all callers.
(preserve_only_constants): Retain value equivalences.
(references_value_p): Retain preserved values.
(rtx_equal_for_cselib_1): Handle value equivalences.
(cselib_invalidate_regno): Use canonical value.
(cselib_add_permanent_equiv): New.
* alias.c (find_base_term): Reset locs lists while recursing.
* var-tracking.c (val_bind): New. Don't add equivalences
present in cselib table, compared with code moved from...
(val_store): ... here.
(val_resolve): Use val_bind.
(VAL_EXPR_HAS_REVERSE): Drop.
(add_uses): Do not create MOps for addresses. Do not mark
non-REG non-MEM expressions as requiring resolution.
(reverse_op): Record reverse as a cselib equivalence.
(add_stores): Use it. Do not create MOps for addresses.
Do not require resolution for non-REG non-MEM expressions.
Simplify support for reverse operations.
(compute_bb_dataflow): Drop reverse support.
(emit_notes_in_bb): Likewise.
(create_entry_value): Rename to...
(record_entry_value): ... this. Use cselib equivalences.
(vt_add_function_parameter): Adjust.
2011-12-30 Michael Meissner <meissner@linux.vnet.ibm.com>
* config/rs6000/rs6000.c (rs6000_inner_target_options): Fix thinko

27
gcc/alias.c
View File

@ -1542,7 +1542,8 @@ rtx
find_base_term (rtx x)
{
cselib_val *val;
struct elt_loc_list *l;
struct elt_loc_list *l, *f;
rtx ret;
#if defined (FIND_BASE_TERM)
/* Try machine-dependent ways to find the base term. */
@ -1591,12 +1592,26 @@ find_base_term (rtx x)
case VALUE:
val = CSELIB_VAL_PTR (x);
ret = NULL_RTX;
if (!val)
return 0;
for (l = val->locs; l; l = l->next)
if ((x = find_base_term (l->loc)) != 0)
return x;
return 0;
return ret;
f = val->locs;
/* Temporarily reset val->locs to avoid infinite recursion. */
val->locs = NULL;
for (l = f; l; l = l->next)
if (GET_CODE (l->loc) == VALUE
&& CSELIB_VAL_PTR (l->loc)->locs
&& !CSELIB_VAL_PTR (l->loc)->locs->next
&& CSELIB_VAL_PTR (l->loc)->locs->loc == x)
continue;
else if ((ret = find_base_term (l->loc)) != 0)
break;
val->locs = f;
return ret;
case LO_SUM:
/* The standard form is (lo_sum reg sym) so look only at the

164
gcc/cselib.c
View File

@ -55,7 +55,7 @@ static bool cselib_preserve_constants;
static int entry_and_rtx_equal_p (const void *, const void *);
static hashval_t get_value_hash (const void *);
static struct elt_list *new_elt_list (struct elt_list *, cselib_val *);
static struct elt_loc_list *new_elt_loc_list (struct elt_loc_list *, rtx);
static void new_elt_loc_list (cselib_val *, rtx);
static void unchain_one_value (cselib_val *);
static void unchain_one_elt_list (struct elt_list **);
static void unchain_one_elt_loc_list (struct elt_loc_list **);
@ -223,26 +223,75 @@ new_elt_list (struct elt_list *next, cselib_val *elt)
return el;
}
/* Allocate a struct elt_loc_list and fill in its two elements with the
arguments. */
/* Allocate a struct elt_loc_list with LOC and prepend it to VAL's loc
list. */
static inline struct elt_loc_list *
new_elt_loc_list (struct elt_loc_list *next, rtx loc)
static inline void
new_elt_loc_list (cselib_val *val, rtx loc)
{
struct elt_loc_list *el;
el = (struct elt_loc_list *) pool_alloc (elt_loc_list_pool);
el->next = next;
el->loc = loc;
el->setting_insn = cselib_current_insn;
gcc_assert (!next || !next->setting_insn
|| !DEBUG_INSN_P (next->setting_insn));
struct elt_loc_list *el, *next = val->locs;
gcc_checking_assert (!next || !next->setting_insn
|| !DEBUG_INSN_P (next->setting_insn)
|| cselib_current_insn == next->setting_insn);
/* If we're creating the first loc in a debug insn context, we've
just created a debug value. Count it. */
if (!next && cselib_current_insn && DEBUG_INSN_P (cselib_current_insn))
n_debug_values++;
return el;
val = canonical_cselib_val (val);
next = val->locs;
if (GET_CODE (loc) == VALUE)
{
loc = canonical_cselib_val (CSELIB_VAL_PTR (loc))->val_rtx;
gcc_checking_assert (PRESERVED_VALUE_P (loc)
== PRESERVED_VALUE_P (val->val_rtx));
if (val->val_rtx == loc)
return;
else if (val->uid > CSELIB_VAL_PTR (loc)->uid)
{
/* Reverse the insertion. */
new_elt_loc_list (CSELIB_VAL_PTR (loc), val->val_rtx);
return;
}
gcc_checking_assert (val->uid < CSELIB_VAL_PTR (loc)->uid);
if (CSELIB_VAL_PTR (loc)->locs)
{
/* Bring all locs from LOC to VAL. */
for (el = CSELIB_VAL_PTR (loc)->locs; el->next; el = el->next)
{
/* Adjust values that have LOC as canonical so that VAL
becomes their canonical. */
if (el->loc && GET_CODE (el->loc) == VALUE)
{
gcc_checking_assert (CSELIB_VAL_PTR (el->loc)->locs->loc
== loc);
CSELIB_VAL_PTR (el->loc)->locs->loc = val->val_rtx;
}
}
el->next = val->locs;
next = val->locs = CSELIB_VAL_PTR (loc)->locs;
}
/* Chain LOC back to VAL. */
el = (struct elt_loc_list *) pool_alloc (elt_loc_list_pool);
el->loc = val->val_rtx;
el->setting_insn = cselib_current_insn;
el->next = NULL;
CSELIB_VAL_PTR (loc)->locs = el;
}
el = (struct elt_loc_list *) pool_alloc (elt_loc_list_pool);
el->loc = loc;
el->setting_insn = cselib_current_insn;
el->next = next;
val->locs = el;
}
/* Promote loc L to a nondebug cselib_current_insn if L is marked as
@ -320,6 +369,7 @@ static int
preserve_only_constants (void **x, void *info ATTRIBUTE_UNUSED)
{
cselib_val *v = (cselib_val *)*x;
struct elt_loc_list *l;
if (v->locs != NULL
&& v->locs->next == NULL)
@ -328,6 +378,14 @@ preserve_only_constants (void **x, void *info ATTRIBUTE_UNUSED)
&& (GET_CODE (v->locs->loc) != CONST
|| !references_value_p (v->locs->loc, 0)))
return 1;
/* Although a debug expr may be bound to different expressions,
we can preserve it as if it was constant, to get unification
and proper merging within var-tracking. */
if (GET_CODE (v->locs->loc) == DEBUG_EXPR
|| GET_CODE (v->locs->loc) == DEBUG_IMPLICIT_PTR
|| GET_CODE (v->locs->loc) == ENTRY_VALUE
|| GET_CODE (v->locs->loc) == DEBUG_PARAMETER_REF)
return 1;
if (cfa_base_preserved_val)
{
if (v == cfa_base_preserved_val)
@ -338,14 +396,11 @@ preserve_only_constants (void **x, void *info ATTRIBUTE_UNUSED)
return 1;
}
}
/* Keep around VALUEs that forward function invariant ENTRY_VALUEs
to corresponding parameter VALUEs. */
if (v->locs != NULL
&& v->locs->next != NULL
&& v->locs->next->next == NULL
&& GET_CODE (v->locs->next->loc) == ENTRY_VALUE
&& GET_CODE (v->locs->loc) == VALUE)
return 1;
/* Keep VALUE equivalences around. */
for (l = v->locs; l; l = l->next)
if (GET_CODE (l->loc) == VALUE)
return 1;
htab_clear_slot (cselib_hash_table, x);
return 1;
@ -490,7 +545,8 @@ references_value_p (const_rtx x, int only_useless)
int i, j;
if (GET_CODE (x) == VALUE
&& (! only_useless || CSELIB_VAL_PTR (x)->locs == 0))
&& (! only_useless ||
(CSELIB_VAL_PTR (x)->locs == 0 && !PRESERVED_VALUE_P (x))))
return 1;
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
@ -744,20 +800,22 @@ rtx_equal_for_cselib_1 (rtx x, rtx y, enum machine_mode memmode)
if (x == y)
return 1;
if (GET_CODE (x) == VALUE && GET_CODE (y) == VALUE)
return CSELIB_VAL_PTR (x) == CSELIB_VAL_PTR (y);
if (GET_CODE (x) == VALUE)
{
cselib_val *e = CSELIB_VAL_PTR (x);
cselib_val *e = canonical_cselib_val (CSELIB_VAL_PTR (x));
struct elt_loc_list *l;
if (GET_CODE (y) == VALUE)
return e == canonical_cselib_val (CSELIB_VAL_PTR (y));
for (l = e->locs; l; l = l->next)
{
rtx t = l->loc;
/* Avoid infinite recursion. */
if (REG_P (t) || MEM_P (t))
/* Avoid infinite recursion. We know we have the canonical
value, so we can just skip any values in the equivalence
list. */
if (REG_P (t) || MEM_P (t) || GET_CODE (t) == VALUE)
continue;
else if (rtx_equal_for_cselib_1 (t, y, memmode))
return 1;
@ -765,17 +823,16 @@ rtx_equal_for_cselib_1 (rtx x, rtx y, enum machine_mode memmode)
return 0;
}
if (GET_CODE (y) == VALUE)
else if (GET_CODE (y) == VALUE)
{
cselib_val *e = CSELIB_VAL_PTR (y);
cselib_val *e = canonical_cselib_val (CSELIB_VAL_PTR (y));
struct elt_loc_list *l;
for (l = e->locs; l; l = l->next)
{
rtx t = l->loc;
if (REG_P (t) || MEM_P (t))
if (REG_P (t) || MEM_P (t) || GET_CODE (t) == VALUE)
continue;
else if (rtx_equal_for_cselib_1 (x, t, memmode))
return 1;
@ -1217,9 +1274,8 @@ add_mem_for_addr (cselib_val *addr_elt, cselib_val *mem_elt, rtx x)
}
addr_elt->addr_list = new_elt_list (addr_elt->addr_list, mem_elt);
mem_elt->locs
= new_elt_loc_list (mem_elt->locs,
replace_equiv_address_nv (x, addr_elt->val_rtx));
new_elt_loc_list (mem_elt,
replace_equiv_address_nv (x, addr_elt->val_rtx));
if (mem_elt->next_containing_mem == NULL)
{
mem_elt->next_containing_mem = first_containing_mem;
@ -1858,7 +1914,7 @@ cselib_lookup_1 (rtx x, enum machine_mode mode,
}
e = new_cselib_val (next_uid, GET_MODE (x), x);
e->locs = new_elt_loc_list (e->locs, x);
new_elt_loc_list (e, x);
if (REG_VALUES (i) == 0)
{
/* Maintain the invariant that the first entry of
@ -1901,7 +1957,7 @@ cselib_lookup_1 (rtx x, enum machine_mode mode,
rtx sub = lowpart_subreg (mode, lwider->elt->val_rtx,
GET_MODE (lwider->elt->val_rtx));
if (sub)
e->locs->next = new_elt_loc_list (e->locs->next, sub);
new_elt_loc_list (e, sub);
}
}
REG_VALUES (i)->next = new_elt_list (REG_VALUES (i)->next, e);
@ -1933,8 +1989,7 @@ cselib_lookup_1 (rtx x, enum machine_mode mode,
the hash table is inconsistent until we do so, and
cselib_subst_to_values will need to do lookups. */
*slot = (void *) e;
e->locs = new_elt_loc_list (e->locs,
cselib_subst_to_values (x, memmode));
new_elt_loc_list (e, cselib_subst_to_values (x, memmode));
return e;
}
@ -2059,6 +2114,8 @@ cselib_invalidate_regno (unsigned int regno, enum machine_mode mode)
else
unchain_one_elt_list (l);
v = canonical_cselib_val (v);
had_locs = v->locs != NULL;
setting_insn = v->locs ? v->locs->setting_insn : NULL;
@ -2245,7 +2302,7 @@ cselib_record_set (rtx dest, cselib_val *src_elt, cselib_val *dest_addr_elt)
if (src_elt->locs == 0 && !PRESERVED_VALUE_P (src_elt->val_rtx))
n_useless_values--;
src_elt->locs = new_elt_loc_list (src_elt->locs, dest);
new_elt_loc_list (src_elt, dest);
}
else if (MEM_P (dest) && dest_addr_elt != 0
&& cselib_record_memory)
@ -2256,6 +2313,33 @@ cselib_record_set (rtx dest, cselib_val *src_elt, cselib_val *dest_addr_elt)
}
}
/* Make ELT and X's VALUE equivalent to each other at INSN. */
void
cselib_add_permanent_equiv (cselib_val *elt, rtx x, rtx insn)
{
cselib_val *nelt;
rtx save_cselib_current_insn = cselib_current_insn;
gcc_checking_assert (elt);
gcc_checking_assert (PRESERVED_VALUE_P (elt->val_rtx));
gcc_checking_assert (!side_effects_p (x));
cselib_current_insn = insn;
nelt = cselib_lookup (x, GET_MODE (elt->val_rtx), 1, VOIDmode);
if (nelt != elt)
{
if (!PRESERVED_VALUE_P (nelt->val_rtx))
cselib_preserve_value (nelt);
new_elt_loc_list (nelt, elt->val_rtx);
}
cselib_current_insn = save_cselib_current_insn;
}
/* There is no good way to determine how many elements there can be
in a PARALLEL. Since it's fairly cheap, use a really large number. */
#define MAX_SETS (FIRST_PSEUDO_REGISTER * 2)

19
gcc/cselib.h
View File

@ -96,5 +96,24 @@ extern void cselib_preserve_value (cselib_val *);
extern bool cselib_preserved_value_p (cselib_val *);
extern void cselib_preserve_only_values (void);
extern void cselib_preserve_cfa_base_value (cselib_val *, unsigned int);
extern void cselib_add_permanent_equiv (cselib_val *, rtx, rtx);
extern void dump_cselib_table (FILE *);
/* Return the canonical value for VAL, following the equivalence chain
towards the earliest (== lowest uid) equivalent value. */
static inline cselib_val *
canonical_cselib_val (cselib_val *val)
{
cselib_val *canon;
if (!val->locs || val->locs->next
|| !val->locs->loc || GET_CODE (val->locs->loc) != VALUE
|| val->uid < CSELIB_VAL_PTR (val->locs->loc)->uid)
return val;
canon = CSELIB_VAL_PTR (val->locs->loc);
gcc_checking_assert (canonical_cselib_val (canon) == canon);
return canon;
}

261
gcc/var-tracking.c
View File

@ -2027,6 +2027,50 @@ unsuitable_loc (rtx loc)
}
}
/* Bind VAL to LOC in SET. If MODIFIED, detach LOC from any values
bound to it. */
static inline void
val_bind (dataflow_set *set, rtx val, rtx loc, bool modified)
{
if (REG_P (loc))
{
if (modified)
var_regno_delete (set, REGNO (loc));
var_reg_decl_set (set, loc, VAR_INIT_STATUS_INITIALIZED,
dv_from_value (val), 0, NULL_RTX, INSERT);
}
else if (MEM_P (loc))
{
struct elt_loc_list *l = CSELIB_VAL_PTR (val)->locs;
if (l && GET_CODE (l->loc) == VALUE)
l = canonical_cselib_val (CSELIB_VAL_PTR (l->loc))->locs;
/* If this MEM is a global constant, we don't need it in the
dynamic tables. ??? We should test this before emitting the
micro-op in the first place. */
while (l)
if (GET_CODE (l->loc) == MEM && XEXP (l->loc, 0) == XEXP (loc, 0))
break;
else
l = l->next;
if (!l)
var_mem_decl_set (set, loc, VAR_INIT_STATUS_INITIALIZED,
dv_from_value (val), 0, NULL_RTX, INSERT);
}
else
{
/* Other kinds of equivalences are necessarily static, at least
so long as we do not perform substitutions while merging
expressions. */
gcc_unreachable ();
set_variable_part (set, loc, dv_from_value (val), 0,
VAR_INIT_STATUS_INITIALIZED, NULL_RTX, INSERT);
}
}
/* Bind a value to a location it was just stored in. If MODIFIED
holds, assume the location was modified, detaching it from any
values bound to it. */
@ -2058,21 +2102,7 @@ val_store (dataflow_set *set, rtx val, rtx loc, rtx insn, bool modified)
gcc_checking_assert (!unsuitable_loc (loc));
if (REG_P (loc))
{
if (modified)
var_regno_delete (set, REGNO (loc));
var_reg_decl_set (set, loc, VAR_INIT_STATUS_INITIALIZED,
dv_from_value (val), 0, NULL_RTX, INSERT);
}
else if (MEM_P (loc))
var_mem_decl_set (set, loc, VAR_INIT_STATUS_INITIALIZED,
dv_from_value (val), 0, NULL_RTX, INSERT);
else
/* ??? Ideally we wouldn't get these, and use them from the static
cselib loc list. */
set_variable_part (set, loc, dv_from_value (val), 0,
VAR_INIT_STATUS_INITIALIZED, NULL_RTX, INSERT);
val_bind (set, val, loc, modified);
}
/* Reset this node, detaching all its equivalences. Return the slot
@ -2187,20 +2217,13 @@ val_resolve (dataflow_set *set, rtx val, rtx loc, rtx insn)
/* If we didn't find any equivalence, we need to remember that
this value is held in the named register. */
if (!found)
var_reg_decl_set (set, loc, VAR_INIT_STATUS_INITIALIZED,
dv_from_value (val), 0, NULL_RTX, INSERT);
if (found)
return;
}
else if (MEM_P (loc))
/* ??? Merge equivalent MEMs. */
var_mem_decl_set (set, loc, VAR_INIT_STATUS_INITIALIZED,
dv_from_value (val), 0, NULL_RTX, INSERT);
else
/* ??? Ideally we wouldn't get these, and use them from the static
cselib loc list. */
/* ??? Merge equivalent expressions. */
set_variable_part (set, loc, dv_from_value (val), 0,
VAR_INIT_STATUS_INITIALIZED, NULL_RTX, INSERT);
/* ??? Attempt to find and merge equivalent MEMs or other
expressions too. */
val_bind (set, val, loc, false);
}
/* Initialize dataflow set SET to be empty.
@ -5046,10 +5069,6 @@ log_op_type (rtx x, basic_block bb, rtx insn,
MO_CLOBBER as well. */
#define VAL_EXPR_IS_CLOBBERED(x) \
(RTL_FLAG_CHECK1 ("VAL_EXPR_IS_CLOBBERED", (x), CONCAT)->unchanging)
/* Whether the location is a CONCAT of the MO_VAL_SET expression and
a reverse operation that should be handled afterwards. */
#define VAL_EXPR_HAS_REVERSE(x) \
(RTL_FLAG_CHECK1 ("VAL_EXPR_HAS_REVERSE", (x), CONCAT)->return_val)
/* All preserved VALUEs. */
static VEC (rtx, heap) *preserved_values;
@ -5129,28 +5148,7 @@ add_uses (rtx *ploc, void *data)
GET_MODE (mloc));
if (val && !cselib_preserved_value_p (val))
{
micro_operation moa;
preserve_value (val);
if (GET_CODE (XEXP (mloc, 0)) != ENTRY_VALUE
&& (GET_CODE (XEXP (mloc, 0)) != PLUS
|| XEXP (XEXP (mloc, 0), 0) != cfa_base_rtx
|| !CONST_INT_P (XEXP (XEXP (mloc, 0), 1))))
{
mloc = cselib_subst_to_values (XEXP (mloc, 0),
GET_MODE (mloc));
moa.type = MO_VAL_USE;
moa.insn = cui->insn;
moa.u.loc = gen_rtx_CONCAT (address_mode,
val->val_rtx, mloc);
if (dump_file && (dump_flags & TDF_DETAILS))
log_op_type (moa.u.loc, cui->bb, cui->insn,
moa.type, dump_file);
VEC_safe_push (micro_operation, heap, VTI (bb)->mos,
&moa);
}
}
preserve_value (val);
}
if (CONSTANT_P (vloc)
@ -5162,7 +5160,11 @@ add_uses (rtx *ploc, void *data)
{
enum machine_mode mode2;
enum micro_operation_type type2;
rtx nloc = replace_expr_with_values (vloc);
rtx nloc = NULL;
bool resolvable = REG_P (vloc) || MEM_P (vloc);
if (resolvable)
nloc = replace_expr_with_values (vloc);
if (nloc)
{
@ -5180,7 +5182,7 @@ add_uses (rtx *ploc, void *data)
if (type2 == MO_CLOBBER
&& !cselib_preserved_value_p (val))
{
VAL_NEEDS_RESOLUTION (oloc) = 1;
VAL_NEEDS_RESOLUTION (oloc) = resolvable;
preserve_value (val);
}
}
@ -5212,28 +5214,7 @@ add_uses (rtx *ploc, void *data)
GET_MODE (mloc));
if (val && !cselib_preserved_value_p (val))
{
micro_operation moa;
preserve_value (val);
if (GET_CODE (XEXP (mloc, 0)) != ENTRY_VALUE
&& (GET_CODE (XEXP (mloc, 0)) != PLUS
|| XEXP (XEXP (mloc, 0), 0) != cfa_base_rtx
|| !CONST_INT_P (XEXP (XEXP (mloc, 0), 1))))
{
mloc = cselib_subst_to_values (XEXP (mloc, 0),
GET_MODE (mloc));
moa.type = MO_VAL_USE;
moa.insn = cui->insn;
moa.u.loc = gen_rtx_CONCAT (address_mode,
val->val_rtx, mloc);
if (dump_file && (dump_flags & TDF_DETAILS))
log_op_type (moa.u.loc, cui->bb, cui->insn,
moa.type, dump_file);
VEC_safe_push (micro_operation, heap, VTI (bb)->mos,
&moa);
}
}
preserve_value (val);
}
type2 = use_type (loc, 0, &mode2);
@ -5256,6 +5237,7 @@ add_uses (rtx *ploc, void *data)
*/
gcc_checking_assert (REG_P (loc) || MEM_P (loc));
nloc = replace_expr_with_values (loc);
if (!nloc)
nloc = oloc;
@ -5307,22 +5289,22 @@ add_uses_1 (rtx *x, void *cui)
representable anyway. */
#define EXPR_USE_DEPTH (PARAM_VALUE (PARAM_MAX_VARTRACK_EXPR_DEPTH))
/* Attempt to reverse the EXPR operation in the debug info. Say for
reg1 = reg2 + 6 even when reg2 is no longer live we
can express its value as VAL - 6. */
/* Attempt to reverse the EXPR operation in the debug info and record
it in the cselib table. Say for reg1 = reg2 + 6 even when reg2 is
no longer live we can express its value as VAL - 6. */
static rtx
reverse_op (rtx val, const_rtx expr)
static void
reverse_op (rtx val, const_rtx expr, rtx insn)
{
rtx src, arg, ret;
cselib_val *v;
enum rtx_code code;
if (GET_CODE (expr) != SET)
return NULL_RTX;
return;
if (!REG_P (SET_DEST (expr)) || GET_MODE (val) != GET_MODE (SET_DEST (expr)))
return NULL_RTX;
return;
src = SET_SRC (expr);
switch (GET_CODE (src))
@ -5333,30 +5315,30 @@ reverse_op (rtx val, const_rtx expr)
case NOT:
case NEG:
if (!REG_P (XEXP (src, 0)))
return NULL_RTX;
return;
break;
case SIGN_EXTEND:
case ZERO_EXTEND:
if (!REG_P (XEXP (src, 0)) && !MEM_P (XEXP (src, 0)))
return NULL_RTX;
return;
break;
default:
return NULL_RTX;
return;
}
if (!SCALAR_INT_MODE_P (GET_MODE (src)) || XEXP (src, 0) == cfa_base_rtx)
return NULL_RTX;
return;
v = cselib_lookup (XEXP (src, 0), GET_MODE (XEXP (src, 0)), 0, VOIDmode);
if (!v || !cselib_preserved_value_p (v))
return NULL_RTX;
return;
switch (GET_CODE (src))
{
case NOT:
case NEG:
if (GET_MODE (v->val_rtx) != GET_MODE (val))
return NULL_RTX;
return;
ret = gen_rtx_fmt_e (GET_CODE (src), GET_MODE (val), val);
break;
case SIGN_EXTEND:
@ -5374,15 +5356,15 @@ reverse_op (rtx val, const_rtx expr)
goto binary;
binary:
if (GET_MODE (v->val_rtx) != GET_MODE (val))
return NULL_RTX;
return;
arg = XEXP (src, 1);
if (!CONST_INT_P (arg) && GET_CODE (arg) != SYMBOL_REF)
{
arg = cselib_expand_value_rtx (arg, scratch_regs, 5);
if (arg == NULL_RTX)
return NULL_RTX;
return;
if (!CONST_INT_P (arg) && GET_CODE (arg) != SYMBOL_REF)
return NULL_RTX;
return;
}
ret = simplify_gen_binary (code, GET_MODE (val), val, arg);
if (ret == val)
@ -5395,7 +5377,7 @@ reverse_op (rtx val, const_rtx expr)
gcc_unreachable ();
}
return gen_rtx_CONCAT (GET_MODE (v->val_rtx), v->val_rtx, ret);
cselib_add_permanent_equiv (v, ret, insn);
}
/* Add stores (register and memory references) LOC which will be tracked
@ -5414,7 +5396,6 @@ add_stores (rtx loc, const_rtx expr, void *cuip)
bool track_p = false;
cselib_val *v;
bool resolve, preserve;
rtx reverse;
if (type == MO_CLOBBER)
return;
@ -5479,26 +5460,7 @@ add_stores (rtx loc, const_rtx expr, void *cuip)
GET_MODE (mloc));
if (val && !cselib_preserved_value_p (val))
{
preserve_value (val);
if (GET_CODE (XEXP (mloc, 0)) != ENTRY_VALUE
&& (GET_CODE (XEXP (mloc, 0)) != PLUS
|| XEXP (XEXP (mloc, 0), 0) != cfa_base_rtx
|| !CONST_INT_P (XEXP (XEXP (mloc, 0), 1))))
{
mloc = cselib_subst_to_values (XEXP (mloc, 0),
GET_MODE (mloc));
mo.type = MO_VAL_USE;
mo.insn = cui->insn;
mo.u.loc = gen_rtx_CONCAT (address_mode,
val->val_rtx, mloc);
if (dump_file && (dump_flags & TDF_DETAILS))
log_op_type (mo.u.loc, cui->bb, cui->insn,
mo.type, dump_file);
VEC_safe_push (micro_operation, heap, VTI (bb)->mos, &mo);
}
}
preserve_value (val);
}
if (GET_CODE (expr) == CLOBBER || !track_p)
@ -5578,7 +5540,10 @@ add_stores (rtx loc, const_rtx expr, void *cuip)
}
else if (resolve && GET_CODE (mo.u.loc) == SET)
{
nloc = replace_expr_with_values (SET_SRC (expr));
if (REG_P (SET_SRC (expr)) || MEM_P (SET_SRC (expr)))
nloc = replace_expr_with_values (SET_SRC (expr));
else
nloc = NULL_RTX;
/* Avoid the mode mismatch between oexpr and expr. */
if (!nloc && mode != mode2)
@ -5587,7 +5552,7 @@ add_stores (rtx loc, const_rtx expr, void *cuip)
gcc_assert (oloc == SET_DEST (expr));
}
if (nloc)
if (nloc && nloc != SET_SRC (mo.u.loc))
oloc = gen_rtx_SET (GET_MODE (mo.u.loc), oloc, nloc);
else
{
@ -5634,14 +5599,7 @@ add_stores (rtx loc, const_rtx expr, void *cuip)
*/
if (GET_CODE (PATTERN (cui->insn)) != COND_EXEC)
{
reverse = reverse_op (v->val_rtx, expr);
if (reverse)
{
loc = gen_rtx_CONCAT (GET_MODE (mo.u.loc), loc, reverse);
VAL_EXPR_HAS_REVERSE (loc) = 1;
}
}
reverse_op (v->val_rtx, expr, cui->insn);
mo.u.loc = loc;
@ -6299,14 +6257,9 @@ compute_bb_dataflow (basic_block bb)
case MO_VAL_SET:
{
rtx loc = mo->u.loc;
rtx val, vloc, uloc, reverse = NULL_RTX;
rtx val, vloc, uloc;
vloc = loc;
if (VAL_EXPR_HAS_REVERSE (loc))
{
reverse = XEXP (loc, 1);
vloc = XEXP (loc, 0);
}
uloc = XEXP (vloc, 1);
val = XEXP (vloc, 0);
vloc = uloc;
@ -6382,10 +6335,6 @@ compute_bb_dataflow (basic_block bb)
var_regno_delete (out, REGNO (uloc));
val_store (out, val, vloc, insn, true);
if (reverse)
val_store (out, XEXP (reverse, 0), XEXP (reverse, 1),
insn, false);
}
break;
@ -7698,6 +7647,7 @@ notify_dependents_of_resolved_value (variable ivar, htab_t vars)
/* We won't notify variables that are being expanded,
because their dependency list is cleared before
recursing. */
NO_LOC_P (value) = false;
VALUE_RECURSED_INTO (value) = false;
gcc_checking_assert (dv_changed_p (dv));
@ -7910,7 +7860,10 @@ vt_expand_loc_callback (rtx x, bitmap regs,
gcc_checking_assert (!VALUE_RECURSED_INTO (x) || NO_LOC_P (x));
if (NO_LOC_P (x))
return NULL;
{
gcc_checking_assert (VALUE_RECURSED_INTO (x) || !dv_changed_p (dv));
return NULL;
}
var = (variable) htab_find_with_hash (elcd->vars, dv, dv_htab_hash (dv));
@ -8709,14 +8662,9 @@ emit_notes_in_bb (basic_block bb, dataflow_set *set)
case MO_VAL_SET:
{
rtx loc = mo->u.loc;
rtx val, vloc, uloc, reverse = NULL_RTX;
rtx val, vloc, uloc;
vloc = loc;
if (VAL_EXPR_HAS_REVERSE (loc))
{
reverse = XEXP (loc, 1);
vloc = XEXP (loc, 0);
}
uloc = XEXP (vloc, 1);
val = XEXP (vloc, 0);
vloc = uloc;
@ -8787,10 +8735,6 @@ emit_notes_in_bb (basic_block bb, dataflow_set *set)
val_store (set, val, vloc, insn, true);
if (reverse)
val_store (set, XEXP (reverse, 0), XEXP (reverse, 1),
insn, false);
emit_notes_for_changes (next_insn, EMIT_NOTE_BEFORE_INSN,
set->vars);
}
@ -8957,28 +8901,17 @@ vt_get_decl_and_offset (rtx rtl, tree *declp, HOST_WIDE_INT *offsetp)
return false;
}
/* Mark the value for the ENTRY_VALUE of RTL as equivalent to EQVAL in
OUT. */
/* Record the value for the ENTRY_VALUE of RTL as a global equivalence
of VAL. */
static void
create_entry_value (dataflow_set *out, rtx eqval, rtx rtl)
record_entry_value (cselib_val *val, rtx rtl)
{
rtx ev = gen_rtx_ENTRY_VALUE (GET_MODE (rtl));
cselib_val *val;
ENTRY_VALUE_EXP (ev) = rtl;
val = cselib_lookup_from_insn (ev, GET_MODE (ev), true,
VOIDmode, get_insns ());
if (val->val_rtx != eqval)
{
preserve_value (val);
set_variable_part (out, val->val_rtx, dv_from_value (eqval), 0,
VAR_INIT_STATUS_INITIALIZED, NULL_RTX, INSERT);
set_variable_part (out, eqval, dv_from_value (val->val_rtx), 0,
VAR_INIT_STATUS_INITIALIZED, NULL_RTX, INSERT);
}
cselib_add_permanent_equiv (val, ev, get_insns ());
}
/* Insert function parameter PARM in IN and OUT sets of ENTRY_BLOCK. */
@ -9137,7 +9070,7 @@ vt_add_function_parameter (tree parm)
VAR_INIT_STATUS_INITIALIZED, NULL, INSERT);
if (dv_is_value_p (dv))
{
create_entry_value (out, dv_as_value (dv), incoming);
record_entry_value (CSELIB_VAL_PTR (dv_as_value (dv)), incoming);
if (TREE_CODE (TREE_TYPE (parm)) == REFERENCE_TYPE
&& INTEGRAL_TYPE_P (TREE_TYPE (TREE_TYPE (parm))))
{
@ -9150,9 +9083,9 @@ vt_add_function_parameter (tree parm)
if (val)
{
preserve_value (val);
record_entry_value (val, mem);
set_variable_part (out, mem, dv_from_value (val->val_rtx), 0,
VAR_INIT_STATUS_INITIALIZED, NULL, INSERT);
create_entry_value (out, val->val_rtx, mem);
}
}
}