re PR rtl-optimization/6177 (ia64 ICE with single-element complex array in LAPACK)

	PR optimization/6177
	* expr.c (expand_expr) [COMPONENT_REF]: Handle op0 CONCAT if
	bitpos is 0 and bitsize CONCAT size.

	* gcc.c-torture/execute/20020411-1.c: New test.

From-SVN: r52178

gcc/ChangeLog

 2002-04-11  Jakub Jelinek  <jakub@redhat.com>
 
+	PR optimization/6177
+	* expr.c (expand_expr) [COMPONENT_REF]: Handle op0 CONCAT if
+	bitpos is 0 and bitsize CONCAT size.
+
+2002-04-11  Jakub Jelinek  <jakub@redhat.com>
+
 	PR c/6223
 	* combine.c (if_then_else_cond): Use trunc_int_for_mode on nz.
 

gcc/expr.c

@@ -6954,6 +6954,16 @@ expand_expr (exp, target, tmode, modifier)
 	    MEM_VOLATILE_P (op0) = 1;
 	  }
 
+	/* The following code doesn't handle CONCAT.
+	   Assume only bitpos == 0 can be used for CONCAT, due to
+	   one element arrays having the same mode as its element.  */
+	if (GET_CODE (op0) == CONCAT)
+	  {
+	    if (bitpos != 0 || bitsize != GET_MODE_BITSIZE (GET_MODE (op0)))
+	      abort ();
+	    return op0;
+	  }
+
 	/* In cases where an aligned union has an unaligned object
 	   as a field, we might be extracting a BLKmode value from
 	   an integer-mode (e.g., SImode) object.  Handle this case

gcc/testsuite/ChangeLog

 2002-04-11  Jakub Jelinek  <jakub@redhat.com>
 
-	PR c/6223
-	* combine.c (if_then_else_cond): Use trunc_int_for_mode on nz.
-
 	* gcc.dg/20020411-1.c: New test.
 
+	* gcc.c-torture/execute/20020411-1.c: New test.
+
 2002-04-10  Janis Johnson  <janis187@us.ibm.com>
 
 	* g77.f-torture/execute/6177.f: New test.

gcc/testsuite/gcc.c-torture/execute/20020411-1.c

+/* PR optimization/6177
+   This testcase ICEd because expr.c did not expect to see a CONCAT
+   as array rtl.  */
+
+extern void abort (void);
+extern void exit (int);
+
+__complex__ float foo (void)
+{
+  __complex__ float f[1];
+  __real__ f[0] = 1.0;
+  __imag__ f[0] = 1.0;
+  f[0] = __builtin_conjf (f[0]);
+  return f[0];
+}
+
+int main (void)
+{
+  __complex__ double d[1];
+  d[0] = foo ();
+  if (__real__ d[0] != 1.0
+      || __imag__ d[0] != -1.0)
+    abort ();
+  exit (0);
+}