re PR rtl-optimization/57268 (c nested loops hang compiler in sched-deps.c)

2013-05-31  Dinar Temirbulatov  <dinar@kugelworks.com>

        PR rtl-optimization/57268
        * sched-deps.c (sched_analyze_2): Flush dependence lists if
        the sum of the read and write lists exceeds MAX_PENDING_LIST_LENGTH.

From-SVN: r199564

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0dbe13ae2bbc4dea5a30e7845068ac9b8e3c177b..39f24a65819d843b178a1bdbf921e3636ebc2f2a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2013-05-31  Dinar Temirbulatov  <dinar@kugelworks.com>
+
+       PR rtl-optimization/57268
+       * sched-deps.c (sched_analyze_2): Flush dependence lists if
+       the sum of the read and write lists exceeds MAX_PENDING_LIST_LENGTH.
+
 2013-05-31  Eric Botcazou  <ebotcazou@adacore.com>
 
        * config/rs6000/predicates.md (rs6000_cbranch_operator): Accept some

diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c
index c7ef1d8e67e977729d402a1b22844cedb1fb17f4..190fd4eb4bf19ee9b2cebe2f92a306aa599c17f6 100644 (file)
--- a/gcc/sched-deps.c
+++ b/gcc/sched-deps.c
@@ -2690,8 +2690,14 @@ sched_analyze_2 (struct deps_desc *deps, rtx x, rtx insn)
 
        /* Always add these dependencies to pending_reads, since
           this insn may be followed by a write.  */
-        if (!deps->readonly)
-          add_insn_mem_dependence (deps, true, insn, x);
+       if (!deps->readonly)
+         {
+           if ((deps->pending_read_list_length
+                + deps->pending_write_list_length)
+               > MAX_PENDING_LIST_LENGTH)
+             flush_pending_lists (deps, insn, true, true);
+           add_insn_mem_dependence (deps, true, insn, x);
+       }
 
        sched_analyze_2 (deps, XEXP (x, 0), insn);