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From: "markus at trippelsdorf dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/55253] [4.8 Regression] Revision 193298 miscompiles sqlite with -Os
Date: Sun, 11 Nov 2012 09:22:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55253

--- Comment #1 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2012-11-11 09:22:12 UTC ---
Reduced:

markus@x4 /tmp % cat test.i
struct
{
    int mallocFailed;
}
*a;

struct StrAccum
{
    int useMalloc;
}
b, c;

static void
fn1 (struct StrAccum *p1, int p2)
{
    if (p2 == 0)
        return;
    if (p1->useMalloc)
        a->mallocFailed = 0;
}

void
fn2 (struct StrAccum *p1)
{
    fn1 (p1, 1);
}

void
fn3 (struct StrAccum *p1)
{
    fn1 (p1, 1);
}

void
fn4 ()
{
    c.useMalloc = 1;
    fn1 (&c, 0);
}

int
main ()
{
    fn3 (&b);
    return 0;
}

markus@x4 /tmp % gcc -Os test.i && ./a.out
[1]    25665 segmentation fault  ./a.out

markus@x4 /tmp % gcc -O2 test.i && ./a.out
markus@x4 /tmp %