re PR target/40031 (ARM broken with addresses in PHIs with -fPIC)

        PR target/40031
        * config/arm/arm.c (require_pic_register): Emit on entry
        edge, not at entry of function.
testsuite/
        * gcc.dg/pr40031.c: New test.

From-SVN: r147350

gcc/ChangeLog

+2009-05-10  Michael Matz  <matz@suse.de>
+
+	PR target/40031
+	* config/arm/arm.c (require_pic_register): Emit on entry edge,
+	not at entry of function.
+
 2009-05-10  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/40081

gcc/config/arm/arm.c

@@ -3596,7 +3596,11 @@ require_pic_register (void)
 
 	      seq = get_insns ();
 	      end_sequence ();
-	      emit_insn_after (seq, entry_of_function ());
+	      /* We can be called during expansion of PHI nodes, where
+	         we can't yet emit instructions directly in the final
+		 insn stream.  Queue the insns on the entry edge, they will
+		 be committed after everything else is expanded.  */
+	      insert_insn_on_edge (seq, single_succ_edge (ENTRY_BLOCK_PTR));
 	    }
 	}
     }

gcc/testsuite/ChangeLog

+2009-05-10  Michael Matz  <matz@suse.de>
+
+	PR target/40031
+	* gcc.dg/pr40031.c: New test.
+
 2009-05-10  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/40018

gcc/testsuite/gcc.dg/pr40031.c

+/* { dg-do compile { target fpic } } */
+/* { dg-options "-O2 -fPIC" } */
+double c;
+double d;
+double *f(int a)
+{
+  if(a) return &c;
+  return &d;
+}