re PR c/5420 (bad code generated with gcc3.1/ia64)

	PR c/5420:
	* c-common.c (c_unsafe_for_reeval): Make COMPOUND_LITERAL_EXPR
	unsafe for reevaluation.

	* gcc.c-torture/execute/20020206-2.c: New test.

From-SVN: r49550

gcc/ChangeLog

 2002-02-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c/5420:
+	* c-common.c (c_unsafe_for_reeval): Make COMPOUND_LITERAL_EXPR
+	unsafe for reevaluation.
+
+2002-02-06  Jakub Jelinek  <jakub@redhat.com>
+
 	PR c/5482:
 	* c-common.c (c_expand_expr) [STMT_EXPR]: If last expression is not
 	EXPR_STMT, but COMPOUND_STMT, recurse into it.

gcc/c-common.c

@@ -3567,8 +3567,10 @@ int
 c_unsafe_for_reeval (exp)
      tree exp;
 {
-  /* Statement expressions may not be reevaluated.  */
-  if (TREE_CODE (exp) == STMT_EXPR)
+  /* Statement expressions may not be reevaluated, likewise compound
+     literals.  */
+  if (TREE_CODE (exp) == STMT_EXPR
+      || TREE_CODE (exp) == COMPOUND_LITERAL_EXPR)
     return 2;
 
   /* Walk all other expressions.  */

gcc/testsuite/ChangeLog

@@ -2,6 +2,8 @@
 
 	* gcc.c-torture/execute/20020206-1.c: New test.
 
+	* gcc.c-torture/execute/20020206-2.c: New test.
+
 	PR optimization/5429:
 	* gcc.c-torture/compile/20020206-1.c: New test.
 

gcc/testsuite/gcc.c-torture/execute/20020206-2.c

+/* Origin: PR c/5420 from David Mosberger <davidm@hpl.hp.com>.
+   This testcase was miscompiled when tail call optimizing, because a
+   compound literal initialization was emitted only in the tail call insn
+   chain, not in the normal call insn chain.  */
+
+typedef struct { unsigned short a; } A;
+
+extern void abort (void);
+extern void exit (int);
+
+void foo (unsigned int x)
+{
+  if (x != 0x800 && x != 0x810)
+    abort ();
+}
+
+int
+main (int argc, char **argv)
+{
+  int i;
+  for (i = 0; i < 2; ++i)
+    foo (((A) { ((!(i >> 4) ? 8 : 64 + (i >> 4)) << 8) + (i << 4) } ).a);
+  exit (0);
+}