Update comments.

From-SVN: r13636

diff --git a/gcc/combine.c b/gcc/combine.c
index 800d0c71e4b7634293421ffad7c8673a9265cd05..2265eb3e53771567db0fd941ed0f89ef952d69d8 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -952,7 +952,12 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
         insns.  Eliminate this problem by not combining with such an insn.
 
         Also, on some machines we don't want to extend the life of a hard
-        register.  */
+        register.
+
+        This is the same test done in can_combine except that we don't test
+        if SRC is a CALL operation to permit a hard register with
+        SMALL_REGISTER_CLASSES, and that we have to take all_adjacent
+        into account.  */
 
       if (GET_CODE (src) == REG
          && ((REGNO (dest) < FIRST_PSEUDO_REGISTER