The following makes the fix for PR87132 less constrained so we can use
the recently added facility for VN disambiguation agains the original
ref tree.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.
Richard.
2019-09-16 Richard Biener <rguent...@suse.de>
PR tree-optimization/91756
PR tree-optimization/87132
* tree-ssa-alias.h (enum translate_flags): New.
(get_continuation_for_phi): Use it instead of simple bool flag.
(walk_non_aliased_vuses): Likewise.
* tree-ssa-alias.c (maybe_skip_until): Adjust.
(get_continuation_for_phi): When looking across backedges only
disallow valueization.
(walk_non_aliased_vuses): Adjust.
* tree-ssa-sccvn.c (vn_reference_lookup_3): Avoid valueization
if requested.
* gcc.dg/tree-ssa/ssa-fre-81.c: New testcase.
Index: gcc/tree-ssa-alias.c
===================================================================
--- gcc/tree-ssa-alias.c (revision 275746)
+++ gcc/tree-ssa-alias.c (working copy)
@@ -3150,7 +3150,8 @@ static bool
maybe_skip_until (gimple *phi, tree &target, basic_block target_bb,
ao_ref *ref, tree vuse, bool tbaa_p, unsigned int &limit,
bitmap *visited, bool abort_on_visited,
- void *(*translate)(ao_ref *, tree, void *, bool *),
+ void *(*translate)(ao_ref *, tree, void *, translate_flags *),
+ translate_flags disambiguate_only,
void *data)
{
basic_block bb = gimple_bb (phi);
@@ -3185,7 +3186,7 @@ maybe_skip_until (gimple *phi, tree &tar
return !abort_on_visited;
vuse = get_continuation_for_phi (def_stmt, ref, tbaa_p, limit,
visited, abort_on_visited,
- translate, data);
+ translate, data, disambiguate_only);
if (!vuse)
return false;
continue;
@@ -3200,9 +3201,9 @@ maybe_skip_until (gimple *phi, tree &tar
--limit;
if (stmt_may_clobber_ref_p_1 (def_stmt, ref, tbaa_p))
{
- bool disambiguate_only = true;
+ translate_flags tf = disambiguate_only;
if (translate
- && (*translate) (ref, vuse, data, &disambiguate_only) == NULL)
+ && (*translate) (ref, vuse, data, &tf) == NULL)
;
else
return false;
@@ -3233,8 +3234,10 @@ tree
get_continuation_for_phi (gimple *phi, ao_ref *ref, bool tbaa_p,
unsigned int &limit, bitmap *visited,
bool abort_on_visited,
- void *(*translate)(ao_ref *, tree, void *, bool *),
- void *data)
+ void *(*translate)(ao_ref *, tree, void *,
+ translate_flags *),
+ void *data,
+ translate_flags disambiguate_only)
{
unsigned nargs = gimple_phi_num_args (phi);
@@ -3276,13 +3279,15 @@ get_continuation_for_phi (gimple *phi, a
else if (! maybe_skip_until (phi, arg0, dom, ref, arg1, tbaa_p,
limit, visited,
abort_on_visited,
- /* Do not translate when walking over
+ translate,
+ /* Do not valueize when walking over
backedges. */
dominated_by_p
(CDI_DOMINATORS,
gimple_bb (SSA_NAME_DEF_STMT (arg1)),
phi_bb)
- ? NULL : translate, data))
+ ? TR_DISAMBIGUATE
+ : disambiguate_only, data))
return NULL_TREE;
}
@@ -3320,7 +3325,8 @@ get_continuation_for_phi (gimple *phi, a
void *
walk_non_aliased_vuses (ao_ref *ref, tree vuse, bool tbaa_p,
void *(*walker)(ao_ref *, tree, void *),
- void *(*translate)(ao_ref *, tree, void *, bool *),
+ void *(*translate)(ao_ref *, tree, void *,
+ translate_flags *),
tree (*valueize)(tree),
unsigned &limit, void *data)
{
@@ -3373,7 +3379,7 @@ walk_non_aliased_vuses (ao_ref *ref, tre
{
if (!translate)
break;
- bool disambiguate_only = false;
+ translate_flags disambiguate_only = TR_TRANSLATE;
res = (*translate) (ref, vuse, data, &disambiguate_only);
/* Failed lookup and translation. */
if (res == (void *)-1)
@@ -3385,7 +3391,7 @@ walk_non_aliased_vuses (ao_ref *ref, tre
else if (res != NULL)
break;
/* Translation succeeded, continue walking. */
- translated = translated || !disambiguate_only;
+ translated = translated || disambiguate_only == TR_TRANSLATE;
}
vuse = gimple_vuse (def_stmt);
}
Index: gcc/tree-ssa-alias.h
===================================================================
--- gcc/tree-ssa-alias.h (revision 275746)
+++ gcc/tree-ssa-alias.h (working copy)
@@ -132,13 +132,18 @@ extern bool call_may_clobber_ref_p (gcal
extern bool call_may_clobber_ref_p_1 (gcall *, ao_ref *);
extern bool stmt_kills_ref_p (gimple *, tree);
extern bool stmt_kills_ref_p (gimple *, ao_ref *);
+enum translate_flags
+ { TR_TRANSLATE, TR_VALUEIZE_AND_DISAMBIGUATE, TR_DISAMBIGUATE };
extern tree get_continuation_for_phi (gimple *, ao_ref *, bool,
unsigned int &, bitmap *, bool,
- void *(*)(ao_ref *, tree, void *, bool *),
- void *);
+ void *(*)(ao_ref *, tree, void *,
+ translate_flags *),
+ void *, translate_flags
+ = TR_VALUEIZE_AND_DISAMBIGUATE);
extern void *walk_non_aliased_vuses (ao_ref *, tree, bool,
void *(*)(ao_ref *, tree, void *),
- void *(*)(ao_ref *, tree, void *, bool *),
+ void *(*)(ao_ref *, tree, void *,
+ translate_flags *),
tree (*)(tree), unsigned &, void *);
extern int walk_aliased_vdefs (ao_ref *, tree,
bool (*)(ao_ref *, tree, void *),
Index: gcc/tree-ssa-sccvn.c
===================================================================
--- gcc/tree-ssa-sccvn.c (revision 275746)
+++ gcc/tree-ssa-sccvn.c (working copy)
@@ -2189,7 +2252,7 @@ adjust_offsets_for_equal_base_address (t
static void *
vn_reference_lookup_3 (ao_ref *ref, tree vuse, void *data_,
- bool *disambiguate_only)
+ translate_flags *disambiguate_only)
{
vn_walk_cb_data *data = (vn_walk_cb_data *)data_;
vn_reference_t vr = data->vr;
@@ -2210,8 +2273,11 @@ vn_reference_lookup_3 (ao_ref *ref, tree
lhs_ops.truncate (0);
basic_block saved_rpo_bb = vn_context_bb;
vn_context_bb = gimple_bb (def_stmt);
- copy_reference_ops_from_ref (lhs, &lhs_ops);
- lhs_ops = valueize_refs_1 (lhs_ops, &valueized_anything, true);
+ if (*disambiguate_only <= TR_VALUEIZE_AND_DISAMBIGUATE)
+ {
+ copy_reference_ops_from_ref (lhs, &lhs_ops);
+ lhs_ops = valueize_refs_1 (lhs_ops, &valueized_anything, true);
+ }
vn_context_bb = saved_rpo_bb;
if (valueized_anything)
{
@@ -2221,7 +2287,7 @@ vn_reference_lookup_3 (ao_ref *ref, tree
if (lhs_ref_ok
&& !refs_may_alias_p_1 (ref, &lhs_ref, data->tbaa_p))
{
- *disambiguate_only = true;
+ *disambiguate_only = TR_VALUEIZE_AND_DISAMBIGUATE;
return NULL;
}
}
@@ -2248,7 +2314,9 @@ vn_reference_lookup_3 (ao_ref *ref, tree
}
if (!refs_may_alias_p_1 (&data->orig_ref, lref, data->tbaa_p))
{
- *disambiguate_only = true;
+ *disambiguate_only = (valueized_anything
+ ? TR_VALUEIZE_AND_DISAMBIGUATE
+ : TR_DISAMBIGUATE);
return NULL;
}
}
@@ -2290,7 +2358,8 @@ vn_reference_lookup_3 (ao_ref *ref, tree
}
}
}
- else if (gimple_call_builtin_p (def_stmt, BUILT_IN_NORMAL)
+ else if (*disambiguate_only <= TR_VALUEIZE_AND_DISAMBIGUATE
+ && gimple_call_builtin_p (def_stmt, BUILT_IN_NORMAL)
&& gimple_call_num_args (def_stmt) <= 4)
{
/* For builtin calls valueize its arguments and call the
@@ -2319,7 +2388,7 @@ vn_reference_lookup_3 (ao_ref *ref, tree
gimple_call_set_arg (def_stmt, i, oldargs[i]);
if (!res)
{
- *disambiguate_only = true;
+ *disambiguate_only = TR_VALUEIZE_AND_DISAMBIGUATE;
return NULL;
}
}
@@ -2327,7 +2396,7 @@ vn_reference_lookup_3 (ao_ref *ref, tree
/* If we are looking for redundant stores do not create new hashtable
entries from aliasing defs with made up alias-sets. */
- if (*disambiguate_only || !data->tbaa_p)
+ if (*disambiguate_only > TR_TRANSLATE || !data->tbaa_p)
return (void *)-1;
/* If we cannot constrain the size of the reference we cannot
Index: gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-81.c
===================================================================
--- gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-81.c (nonexistent)
+++ gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-81.c (working copy)
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-fre1-details" } */
+
+struct a
+{
+ int foo,bar;
+};
+struct b
+{
+ struct a a[10];
+};
+struct b b, *bptr=&b, *bptr2=&b;
+int j;
+int i;
+int n=1;
+
+int
+main ()
+{
+ int jj=j;
+ bptr2->a[jj].bar = 0;
+ for (int i=0; i<n; i++)
+ bptr->a[i].foo=1;
+ if (!__builtin_constant_p (bptr2->a[jj].bar == 0))
+ __builtin_abort ();
+ return 0;
+}
+
+/* { dg-final { scan-tree-dump "Replaced __builtin_constant_p \\\(\[^)\]*\\\)
with 1" "fre1" } } */
