re PR tree-optimization/42585 (SRA is not good for structure copies with one replacement any more)

2010-01-21  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/42585
	* tree-sra.c (struct access): New field grp_total_scalarization.
	(dump_access): Dump the new field.
	(should_scalarize_away_bitmap): New variable.
	(cannot_scalarize_away_bitmap): Likewise.
	(sra_initialize): Allocate new bitmaps.
	(sra_deinitialize): Free new bitmaps.
	(create_access_1): New function.
	(create_access): Parts moved to create_access_1.
	(type_consists_of_records_p): New function.
	(completely_scalarize_record): Likewise.
	(build_access_from_expr): Set bit in cannot_scalarize_away_bitmap.
	(build_accesses_from_assign): Set bits in should_scalarize_away_bitmap.
	(sort_and_splice_var_accesses): Hint groups with a total_scalarization
	access.
	(analyze_all_variable_accesses): Completely scalarize small eligible
	records.

	* testsuite/gcc.dg/tree-ssa/pr42585.c: New test.

From-SVN: r156156

gcc/ChangeLog

 2010-01-21  Martin Jambor  <mjambor@suse.cz>
 
+	PR tree-optimization/42585
+	* tree-sra.c (struct access): New field grp_total_scalarization.
+	(dump_access): Dump the new field.
+	(should_scalarize_away_bitmap): New variable.
+	(cannot_scalarize_away_bitmap): Likewise.
+	(sra_initialize): Allocate new bitmaps.
+	(sra_deinitialize): Free new bitmaps.
+	(create_access_1): New function.
+	(create_access): Parts moved to create_access_1.
+	(type_consists_of_records_p): New function.
+	(completely_scalarize_record): Likewise.
+	(build_access_from_expr): Set bit in cannot_scalarize_away_bitmap.
+	(build_accesses_from_assign): Set bits in should_scalarize_away_bitmap.
+	(sort_and_splice_var_accesses): Hint groups with a total_scalarization
+	access.
+	(analyze_all_variable_accesses): Completely scalarize small eligible
+	records.
+
+2010-01-21  Martin Jambor  <mjambor@suse.cz>
+
 	* tree-sra.c (build_ref_for_offset_1): Allow for zero size fields.
 
 2010-01-21  Andrew Haley  <aph@redhat.com>

gcc/testsuite/ChangeLog

+2010-01-21  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/42585
+	* gcc.dg/tree-ssa/pr42585.c: New test.
+
 2010-01-21  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/19988

gcc/testsuite/gcc.dg/tree-ssa/pr42585.c

+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-optimized" } */
+
+struct _fat_ptr
+{
+  unsigned char *curr;
+  unsigned char *base;
+  unsigned char *last_plus_one;
+};
+int Cyc_string_ungetc (int ignore, struct _fat_ptr *sptr);
+int
+Cyc_string_ungetc (int ignore, struct _fat_ptr *sptr)
+{
+  struct _fat_ptr *_T0;
+  struct _fat_ptr *_T1;
+  struct _fat_ptr _T2;
+  int _T3;
+  struct _fat_ptr _ans;
+  int _change;
+
+  {
+    _T0 = sptr;
+    _T1 = sptr;
+    _T2 = *sptr;
+    _T3 = -1;
+    _ans = _T2;
+    _change = -1;
+    _ans.curr += 4294967295U;
+    *sptr = _ans;
+    return (0);
+  }
+}
+
+/* The local aggregates . */
+/* { dg-final { scan-tree-dump-times "struct _fat_ptr _ans" 0 "optimized"} } */
+/* { dg-final { scan-tree-dump-times "struct _fat_ptr _T2" 0 "optimized"} } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */