http://llvm.org/bugs/show_bug.cgi?id=17077
Bug ID: 17077
Summary: wrong code at -Os and above on x86_64-linux-gnu
(affecting trunk and 3.3)
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 and clang 3.3 on
x86_64-linux-gnu at -Os and above in both 32-bit and 64-bit modes.
This is a regression from clang 3.2.
$ clang-trunk -v
clang version 3.4 (trunk 189735)
$ clang-trunk -O1 small.c
$ a.out
0
$ clang-trunk -Os small.c
$ a.out
1
$ clang-3.3 -Os small.c
$ a.out
1
$ clang-3.2 -Os small.c
$ a.out
0
$
-------------------------------------
int printf (const char *, ...);
int a[1], b, c;
int foo (int p)
{
return p == 0 ? 0 : 1 / p;
}
int main ()
{
int *d = &b;
if (foo (d != &a[0]))
{
int *e = &c;
int **f = &d;
*f = e;
}
*d = 1;
printf ("%d\n", b);
return 0;
}
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