http://llvm.org/bugs/show_bug.cgi?id=7786
Summary: probable clang 64-bit wrong code bug
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]
[reg...@gamow work016]$ clang -O1 small.c -o small
[reg...@gamow work016]$ ./small
9
[reg...@gamow work016]$ clang -O2 small.c -o small
[reg...@gamow work016]$ ./small
255
[reg...@gamow work016]$ clang -v
clang version 2.8 (trunk 110016)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[reg...@gamow work016]$ cat small.c
extern int printf (__const char *__restrict __format, ...);
signed char foo (signed char si1, signed char si2)
{
return si1 - si2;
}
int g_21[1] = {0x97341720L};
int g_39 = 0x05DE082AL;
int *g_38 = &g_39;
unsigned char g_43 = 0L;
int *l_40[6];
int main(void)
{
const int l_42 = 1L;
int **l_250 = &l_40[3];
int x = (g_21[0] == 6) && (*g_38);
g_43 = foo (x, l_42) & 9L;
if (*g_38) {
*l_250 = g_38;
}
printf("%u\n", g_43);
return 0;
}
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