http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49218
Summary: Incorrect optimization of a 'for' loop creates an
infinite loop
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: perso...@e-maxx.ru
Created attachment 24388
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24388
The program reads a number, and then it should output it back. After incorrect
optimization, however, the program hangs up
The following small program hangs up if compiled under gcc 4.6 with -O2.
The program reads a number (it can be any number, '5' for example), and then it
performs some silly for-loop, and then it should output the same number.
In gcc 4.6 with -O2, however, the program hangs up without outputting anything.
It looks like the loop (which can be doing less that 10 operations in reality)
is 'optimized' into an infinite loop.
