expr.c (expand_assignment): Disable the bitfield += optimizations.

	* expr.c (expand_assignment): Disable the bitfield += optimizations.

	* gcc.c-torture/execute/20040629-1.c (FIELDS1, FIELDS2): Define to
	nothing if not yet defined.  Use it in b, c and d type definitions.
	* gcc.c-torture/execute/20040705-1.c: New test.
	* gcc.c-torture/execute/20040705-2.c: New test.

From-SVN: r84133

gcc/ChangeLog

+2004-07-05  Jakub Jelinek  <jakub@redhat.com>
+
+	* expr.c (expand_assignment): Disable the bitfield += optimizations.
+
 2004-07-05  Joseph S. Myers  <jsm@polyomino.org.uk>
 
 	* doc/sourcebuild.texi: Revert previous patch.

gcc/expr.c

@@ -3802,7 +3802,9 @@ expand_assignment (tree to, tree from, int want_value)
 	  MEM_KEEP_ALIAS_SET_P (to_rtx) = 1;
 	}
 
-      while (mode1 == VOIDmode && !want_value
+      /* Disabled temporarily.  GET_MODE (to_rtx) is often not the right
+	 mode.  */
+      while (0 && mode1 == VOIDmode && !want_value
 	     && bitpos + bitsize <= BITS_PER_WORD
 	     && bitsize < BITS_PER_WORD
 	     && GET_MODE_BITSIZE (GET_MODE (to_rtx)) <= BITS_PER_WORD

gcc/testsuite/ChangeLog

+2004-07-05  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.c-torture/execute/20040629-1.c (FIELDS1, FIELDS2): Define to
+	nothing if not yet defined.  Use it in b, c and d type definitions.
+	* gcc.c-torture/execute/20040705-1.c: New test.
+	* gcc.c-torture/execute/20040705-2.c: New test.
+
 2004-07-05  Giovanni Bajo  <giovannibajo@gcc.gnu.org>
 
 	PR c++/2518

gcc/testsuite/gcc.c-torture/execute/20040629-1.c

@@ -4,9 +4,16 @@
 extern void abort (void);
 extern void exit (int);
 
-struct { unsigned int i : 6, j : 11, k : 15; } b;
-struct { unsigned int i : 5, j : 1, k : 26; } c;
-struct { unsigned int i : 16, j : 8, k : 8; } d;
+#ifndef FIELDS1
+#define FIELDS1
+#endif
+#ifndef FIELDS2
+#define FIELDS2
+#endif
+
+struct { FIELDS1 unsigned int i : 6, j : 11, k : 15; FIELDS2 } b;
+struct { FIELDS1 unsigned int i : 5, j : 1, k : 26; FIELDS2 } c;
+struct { FIELDS1 unsigned int i : 16, j : 8, k : 8; FIELDS2 } d;
 
 unsigned int ret1 (void) { return b.i; }
 unsigned int ret2 (void) { return b.j; }

gcc/testsuite/gcc.c-torture/execute/20040705-1.c

+#define FIELDS1 long long l;
+#include "20040629-1.c"

gcc/testsuite/gcc.c-torture/execute/20040705-2.c

+#define FIELDS2 long long l;
+#include "20040629-1.c"