From: Martin Liska <mliska@suse.cz>
Date: Fri, 28 Apr 2017 12:51:22 +0000 (+0200)
Subject: Fix format_gcov to not print misleading values (PR gcov-profile/53915)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=07ea19a797c6087725fe5b9f2630871c52020311;p=gcc.git

Fix format_gcov to not print misleading values (PR gcov-profile/53915)

2017-04-28  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/53915
	* gcov.c (format_gcov): Print 'NAN %' when top > bottom.

From-SVN: r247375
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 63b6276c07d..608e0e96dab 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-04-28  Martin Liska  <mliska@suse.cz>
+
+	PR gcov-profile/53915
+	* gcov.c (format_gcov): Print 'NAN %' when top > bottom.
+
 2017-04-28  Martin Liska  <mliska@suse.cz>
 
 	PR gcov-profile/79891
diff --git a/gcc/gcov.c b/gcc/gcov.c
index b25464e730e..924a5a38164 100644
--- a/gcc/gcov.c
+++ b/gcc/gcov.c
@@ -1946,6 +1946,13 @@ format_gcov (gcov_type top, gcov_type bottom, int dp)
 {
   static char buffer[20];
 
+  /* Handle invalid values that would result in a misleading value.  */
+  if (bottom != 0 && top > bottom && dp >= 0)
+    {
+      sprintf (buffer, "NAN %%");
+      return buffer;
+    }
+
   if (dp >= 0)
     {
       float ratio = bottom ? (float)top / bottom : 0;