[LLVMbugs] [Bug 726] NEW: Incorrect compilation of some integer arithmetic

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=726

           Summary: Incorrect compilation of some integer arithmetic
           Product: libraries
           Version: 1.6
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Loop Optimizer
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: richard at tartarus.org


I entered the following source file in the web demo of LLVM at
http://llvm.org/demo/index.cgi
(and selected the language of the input data to be C.)

int main(void) {
int a;
int b = 0;
for (a = 10; a > 7; a--) b+=a;
return b;
}

I would expect the main function to return 27, but instead it returns 
-2147483621.  This is exactly 2^31 less than the expected value.  The displayed
output for the main function is:

int %main() {
loopexit:
	tail call void %__main( )
	ret int -2147483621
}



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