https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90186
Bug ID: 90186
Summary: optimizing options -O1 and -O2 produce different
results
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: austin.card at torchtechnologies dot com
Target Milestone: ---
Created attachment 46209
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46209&action=edit
source code and input .txt file
CentOS 7:
g++ -std=c++11 -O1 -o CheckSum main.cpp CheckSum.cpp -I/usr/local/include
./CheckSum
prints a different checksum result than
g++ -std=c++11 -O2 -o CheckSum main.cpp CheckSum.cpp -I/usr/local/include
./CheckSum
If you uncomment line 144 of Udp.h, then both builds output the same result.
Attached is the source code and an input .txt file.
