http://llvm.org/bugs/show_bug.cgi?id=16522
Bug ID: 16522
Summary: wrong code at optimization levels -Os and above (both
32-bit and 64-bit modes)
Product: clang
Version: trunk
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 on
x86_64-linux-gnu at -Os and above (in both 32-bit and 64-bit modes). This is a
regression as both clang 3.2 and 3.3 produce correct code.
$ clang-trunk -v
clang version 3.4 (trunk 185306)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang-trunk -Os reduced.c
$ a.out
-2
$ clang-3.3 -Os reduced.c
$ a.out
-1
$ clang-3.2 -Os reduced.c
$ a.out
-1
$
-------------------------------------------
int printf (const char *, ...);
int a, b = 1, *c = &a;
void
foo (int p)
{
int t;
for (t = 0; t < 16; t++)
p ^= -1;
*c = ~(p & b);
}
int
main ()
{
foo (0);
printf ("%d\n", a);
return 0;
}
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