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[Bug c/37569] Loop incorrectly optimized to endless loop with -Os/-O2/-O3
- From: "ppr at melexis dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 Sep 2008 07:58:36 -0000
- Subject: [Bug c/37569] Loop incorrectly optimized to endless loop with -Os/-O2/-O3
- References: <bug-37569-16736@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from ppr at melexis dot com 2008-09-18 07:58 -------
The problem seems to be related with the i pointer reaching 0. If the loop
condition is e.g. "while ( i != 2 )" everything is ok.
The same if the "sum = sum + *(i)" is replaced e.g. with "sum = sum + *(i+1)"
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37569