Print sensible information when compared test result is zero

We cannot calculate percentage improvement from zero, so
instead print message stating this with test result it's
being compared.

Change-Id: Icea838931782fa661ddec505f5dd2ce1377e5a51
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/compareresults/main.cpp b/tools/compareresults/main.cpp
index c387be7..94d25c0 100644
--- a/tools/compareresults/main.cpp
+++ b/tools/compareresults/main.cpp
@@ -156,7 +156,9 @@ int main(int argc, char **argv)
 
         const double differenceInPercent = (newValue - oldValue) * 100 / oldValue;
 
-        if (differenceInPercent > 0) {
+        if (differenceInPercent == INFINITY) {
+            printf("Reference testrun result for %s was zero. New result is %.f\n", qPrintable(testName), newValue);
+        } else if (differenceInPercent > 0) {
             printf("%s: improvement by %.2f%%\n", qPrintable(testName), differenceInPercent);
         } else if (differenceInPercent < 0) {
             printf("%s: regression by %.2f%%\n", qPrintable(testName), differenceInPercent);