re PR target/44707 (operand requires impossible reload)

ChangeLog:

	PR target/44707
	* config/rs6000/rs6000.c (rs6000_legitimize_reload_address): Recognize
	(lo_sum (high ...) ...) patterns generated by earlier passes.

testsuite/ChangeLog:

	PR target/44707
	* gcc.c-torture/compile/pr44707.c: New test.

From-SVN: r161703

gcc/ChangeLog

+2010-07-02  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	PR target/44707
+	* config/rs6000/rs6000.c (rs6000_legitimize_reload_address): Recognize
+	(lo_sum (high ...) ...) patterns generated by earlier passes.
+
 2010-07-02  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* doc/install.texi (Prerequisites): Document Perl requirement on

gcc/config/rs6000/rs6000.c

@@ -5934,6 +5934,17 @@ rs6000_legitimize_reload_address (rtx x, enum machine_mode mode,
       return x;
     }
 
+  /* Likewise for (lo_sum (high ...) ...) output we have generated.  */
+  if (GET_CODE (x) == LO_SUM
+      && GET_CODE (XEXP (x, 0)) == HIGH)
+    {
+      push_reload (XEXP (x, 0), NULL_RTX, &XEXP (x, 0), NULL,
+		   BASE_REG_CLASS, Pmode, VOIDmode, 0, 0,
+		   opnum, (enum reload_type)type);
+      *win = 1;
+      return x;
+    }
+
 #if TARGET_MACHO
   if (DEFAULT_ABI == ABI_DARWIN && flag_pic
       && GET_CODE (x) == LO_SUM

gcc/testsuite/ChangeLog

+2010-07-02  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	PR target/44707
+	* gcc.c-torture/compile/pr44707.c: New test.
+
 2010-07-02  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/44039

gcc/testsuite/gcc.c-torture/compile/pr44707.c

+extern struct { int a, b, c, d; } v;
+extern int w;
+
+void
+foo (void)
+{
+  int e1 = v.a;
+  int e2 = w;
+  int e3 = v.b;
+  int e4 = v.c;
+  int e5 = v.d;
+  __asm__ volatile ("/* %0 %1 %2 %3 %4 */" : : "nro" (e1), "nro" (e2), "nro" (e3), "nro" (e4), "nro" (e5));
+}
+