http://llvm.org/bugs/show_bug.cgi?id=8547
Summary: likely x86 miscompile using clang
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
The -O1 result looks wrong.
reg...@home:~$ clang -O0 foo.c -o foo
reg...@home:~$ ./foo
g_2 = 64
reg...@home:~$ clang -O1 foo.c -o foo
reg...@home:~$ ./foo
g_2 = 320
reg...@home:~$ cat foo.c
int g_2;
int printf(const char *format, ...);
int main(void) {
for (g_2 = 0; g_2 > -1; g_2++)
{
g_2 = (char)(g_2 << 6);
if (g_2)
break;
g_2 = 4;
}
printf("g_2 = %d\n", g_2);
return 0;
}
reg...@home:~$ clang -v
clang version 2.9 (trunk 118140)
Target: i386-pc-linux-gnu
Thread model: posix
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