PR debug/43516

[pf3gnuchains/gcc-fork.git] / gcc / ira-lives.c

diff --git a/gcc/ira-lives.c b/gcc/ira-lives.c
index b88082a..7ced1a7 100644 (file)
--- a/gcc/ira-lives.c
+++ b/gcc/ira-lives.c
@@ -1,5 +1,5 @@
 /* IRA processing allocno lives to build allocno live ranges.
-   Copyright (C) 2006, 2007, 2008, 2009
+   Copyright (C) 2006, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
    Contributed by Vladimir Makarov <vmakarov@redhat.com>.
 
@@ -805,6 +805,9 @@ ira_implicitly_set_insn_hard_regs (HARD_REG_SET *set)
                        ? GENERAL_REGS
                        : REG_CLASS_FROM_CONSTRAINT (c, p));
                  if (cl != NO_REGS
+                     /* There is no register pressure problem if all of the
+                        regs in this class are fixed.  */
+                     && ira_available_class_regs[cl] != 0
                      && (ira_available_class_regs[cl]
                          <= ira_reg_class_nregs[cl][mode]))
                    IOR_HARD_REG_SET (*set, reg_class_contents[cl]);