re PR gcov-profile/55674 (>20% size increase of lto/pgo binaries since r193747)

2012-12-14  Teresa Johnson  <tejohnson@google.com>

        PR gcov-profile/55674
	* lto-cgraph.c (merge_profile_summaries): Set min correctly the
        first time we merge into a histogram entry.

From-SVN: r194502

gcc/ChangeLog

+2012-12-14  Teresa Johnson  <tejohnson@google.com>
+
+        PR gcov-profile/55674
+	* lto-cgraph.c (merge_profile_summaries): Set min correctly the
+        first time we merge into a histogram entry.
+
 2012-12-14  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/55684

gcc/lto-cgraph.c

@@ -1368,7 +1368,9 @@ merge_profile_summaries (struct lto_file_decl_data **file_data_vec)
          so we need to account for a non-zero histogram entry at new_ix.  */
       unsigned new_ix = gcov_histo_index (scaled_min);
       lto_gcov_summary.histogram[new_ix].min_value
-          = MIN (lto_gcov_summary.histogram[new_ix].min_value, scaled_min);
+          = (lto_gcov_summary.histogram[new_ix].num_counters
+             ? MIN (lto_gcov_summary.histogram[new_ix].min_value, scaled_min)
+             : scaled_min);
       /* Some of the scaled counter values would ostensibly need to be placed
          into different (larger) histogram buckets, but we keep things simple
          here and place the scaled cumulative counter value in the bucket