http://llvm.org/bugs/show_bug.cgi?id=8511
Summary: likely x86 miscompile using clang
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
[reg...@n1 ~]$ cat foo.c
struct S1 {
signed f1 : 22;
signed f2 : 6;
};
struct S1 g_34 = {1,0};
extern int printf(const char *format, ...);
void func_85(struct S1 p_86)
{
g_34.f2 ^= p_86.f2;
}
int main(void)
{
struct S1 l_438 = {-1,0};
func_85(l_438);
printf("g_34.f1 = %d\n", g_34.f1);
return 0;
}
[reg...@n1 ~]$ clang -O0 foo.c -o foo
[reg...@n1 ~]$ ./foo
g_34.f1 = 1
[reg...@n1 ~]$ clang -O1 foo.c -o foo
[reg...@n1 ~]$ ./foo
g_34.f1 = -1
[reg...@n1 ~]$ clang -v
clang version 2.9 (trunk 117638)
Target: i386-pc-linux-gnu
Thread model: posix
[reg...@n1 ~]$
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