http://llvm.org/bugs/show_bug.cgi?id=18023
Bug ID: 18023
Summary: possible array wrong code bug
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Although there are a number of wrong-code bugs open right now, this testcase
doesn't look like them, so hopefully not a dup.
$ /home/regehr/z/compiler-install/llvm-r195376-install/bin/clang -O1 small.c ;
./a.out
1
$ /home/regehr/z/compiler-install/llvm-r195376-install/bin/clang -O2 small.c ;
./a.out
0
$ gcc -O2 small.c ; ./a.out
1
$ cat small.c
int printf(const char *, ...);
int a[3];
volatile int b;
int c;
int main() {
c = 0;
for (; c <= 2; c++) {
a[1] = 1;
a[c] = 0;
b;
}
printf("%d\n", a[1]);
return 0;
}
$ /home/regehr/z/compiler-install/llvm-r195376-install/bin/clang -v
clang version 3.5 (trunk 195376)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
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