http://llvm.org/bugs/show_bug.cgi?id=17078
Bug ID: 17078
Summary: wrong code at -O3 on x86_64-linux-gnu (affecting 3.2,
3.3, trunk)
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following code is miscompiled by the current clang trunk (as well as clang
3.2 and 3.3) on x86_64-linux-gnu at -O3 in both 32-bit and 64-bit modes.
$ clang-trunk -v
clang version 3.4 (trunk 189735)
$ clang-trunk -O2 small.c
$ a.out
0
$ clang-trunk -O3 small.c
$ a.out
1
$ clang-3.3 -O3 small.c
$ a.out
1
$ clang-3.2 -O3 small.c
$ a.out
1
$
----------------------------------------
int printf (const char *, ...);
int a, b = 1, c, d, e, f;
int bar (int p)
{
return p > 0 && 1 / p ? 1 : p;
}
int baz (int *u)
{
int g, *h;
for (;; ++c)
{
int i, **j = &h;
if (c)
for (b = 0; b < 1; b = 1)
{
if (a | bar (6 | f))
return 0;
}
else
*j = &i;
*u = -4;
*h = d & -8;
g = **j + **j;
if (*u >= g)
return 0;
}
}
int main ()
{
baz (&e);
printf ("%d\n", b);
return 0;
}
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