re PR tree-optimization/46351 (incorrect scalarization (2))

2010-11-10  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/46351
	PR tree-optimization/46377
	* tree-sra.c (type_internals_preclude_sra_p): Disqualify types with
	aggregate bit-fields.

	* testsuite/gnat.dg/opt10.adb: New file.
	* testsuite/gnat.dg/opt10_pkg.ads: Likewise.
	* testsuite/gnat.dg/opt11.adb: Likewise.
	* testsuite/gnat.dg/opt11.ads: Likewise.

From-SVN: r166535

gcc/ChangeLog

+2010-11-10  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/46351
+	PR tree-optimization/46377
+	* tree-sra.c (type_internals_preclude_sra_p): Disqualify types with
+	aggregate bit-fields.
+
 2010-11-10  Joseph Myers  <joseph@codesourcery.com>
 
 	* doc/tm.texi.in (TARGET_OPTION_TRANSLATE_TABLE): Remove.

gcc/testsuite/ChangeLog

+2010-11-10  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/46351
+	PR tree-optimization/46377
+	* gnat.dg/opt10.adb: New file.
+	* gnat.dg/opt10_pkg.ads: Likewise.
+	* gnat.dg/opt11.adb: Likewise.
+	* gnat.dg/opt11.ads: Likewise.
+
 2010-11-10  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/boolean_conv.adb: New test.

gcc/testsuite/gnat.dg/opt10.adb

+-- { dg-do compile }
+-- { dg-options "-O2 }
+
+with Opt10_Pkg; use Opt10_Pkg;
+
+procedure Opt10 is
+
+   procedure Compare_Rep_Data (MA, MB : Rep_Message) is
+   begin
+      if MA.Data /= MB.Data then
+         raise Program_Error;
+      end if;
+   end;
+
+   procedure Check_Rep_For (Bit : Boolean) is
+      MA, MB : Rep_Message;
+   begin
+      Safe_Assign (MA, Bit);
+      Safe_Assign (MB, Bit);
+      Compare_Rep_Data (MA, MB);
+   end;
+
+begin
+   Check_Rep_For (Bit => False);
+end;
+

gcc/testsuite/gnat.dg/opt10_pkg.ads

+package Opt10_Pkg is
+
+   type Rep_Message is record
+      Bit : Boolean;
+      Data : String (1 .. 4);
+   end record;
+   for Rep_Message use record
+      Bit  at 0 range 0 .. 0;
+      Data at 0 range 1 .. 32;
+   end record;
+
+   procedure Safe_Assign (M : in out Rep_Message; Bit : Boolean);
+
+end;

gcc/testsuite/gnat.dg/opt11.adb

+-- { dg-compile }
+-- { dg-options "-O" }
+
+package body Opt11 is
+
+   procedure Proc is
+      R : Rec;
+   begin
+      R := (others => <>);
+   end;
+
+end Opt11;

gcc/testsuite/gnat.dg/opt11.ads

+package Opt11 is
+
+   type String_Ptr is access constant String;
+
+   type Form_Type is (Qualified, Unqualified);
+
+   type Rec is record
+      N1, N2, N3 : Natural;
+      Fixed : String_Ptr;
+      Form : Form_Type;
+      Is_Local : Boolean := True;
+   end record;
+   pragma Pack (Rec);
+
+   procedure Proc;
+
+end Opt11;

gcc/tree-sra.c

@@ -653,7 +653,8 @@ type_internals_preclude_sra_p (tree type)
 	    if (TREE_THIS_VOLATILE (fld)
 		|| !DECL_FIELD_OFFSET (fld) || !DECL_SIZE (fld)
 		|| !host_integerp (DECL_FIELD_OFFSET (fld), 1)
-		|| !host_integerp (DECL_SIZE (fld), 1))
+		|| !host_integerp (DECL_SIZE (fld), 1)
+		|| (DECL_BIT_FIELD (fld) && AGGREGATE_TYPE_P (ft)))
 	      return true;
 
 	    if (AGGREGATE_TYPE_P (ft)