(move_movables): Aviod lossage when CALL_INSN_FUNCTION_USAGE

is NULL.

From-SVN: r7777

diff --git a/gcc/loop.c b/gcc/loop.c
index c6caefe..32f3924 100644 (file)
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -1791,8 +1791,9 @@ move_movables (movables, threshold, insn_count, loop_start, end, nregs)
                                  /* Because the USAGE information potentially
                                     contains objects other than hard registers
                                     we need to copy it.  */
-                                 CALL_INSN_FUNCTION_USAGE (i1) =
-                                   copy_rtx (CALL_INSN_FUNCTION_USAGE (temp));
+                                 if (CALL_INSN_FUNCTION_USAGE (temp))
+                                   CALL_INSN_FUNCTION_USAGE (i1) =
+                                     copy_rtx (CALL_INSN_FUNCTION_USAGE (temp));
                                }
                              else
                                i1 = emit_insn_before (body, loop_start);
@@ -1834,8 +1835,9 @@ move_movables (movables, threshold, insn_count, loop_start, end, nregs)
                          /* Because the USAGE information potentially
                             contains objects other than hard registers
                             we need to copy it.  */
-                         CALL_INSN_FUNCTION_USAGE (i1) =
-                           copy_rtx (CALL_INSN_FUNCTION_USAGE (p));
+                         if (CALL_INSN_FUNCTION_USAGE (p))
+                           CALL_INSN_FUNCTION_USAGE (i1) =
+                             copy_rtx (CALL_INSN_FUNCTION_USAGE (p));
                        }
                      else
                        i1 = emit_insn_before (PATTERN (p), loop_start);