PR debug/44028

[pf3gnuchains/gcc-fork.git] / gcc / haifa-sched.c

diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index b7f0cfc..0dd220d 100644 (file)
--- a/gcc/haifa-sched.c
+++ b/gcc/haifa-sched.c
@@ -1695,6 +1695,7 @@ schedule_insn (rtx insn)
         sd_iterator_cond (&sd_it, &dep);)
       {
        rtx dbg = DEP_PRO (dep);
+       struct reg_use_data *use, *next;
 
        gcc_assert (DEBUG_INSN_P (dbg));
 
@@ -1716,6 +1717,14 @@ schedule_insn (rtx insn)
        INSN_VAR_LOCATION_LOC (dbg) = gen_rtx_UNKNOWN_VAR_LOC ();
        df_insn_rescan (dbg);
 
+       /* Unknown location doesn't use any registers.  */
+       for (use = INSN_REG_USE_LIST (dbg); use != NULL; use = next)
+         {
+           next = use->next_insn_use;
+           free (use);
+         }
+       INSN_REG_USE_LIST (dbg) = NULL;
+
        /* We delete rather than resolve these deps, otherwise we
           crash in sched_free_deps(), because forward deps are
           expected to be released before backward deps.  */