------- Comment #7 from hjl dot tools at gmail dot com 2009-12-29 21:40 -------
Here is a testcase in C:
[...@gnu-6 tmp]$ cat y.c
unsigned int foo[] __attribute__ ((aligned(16))) =
{
0x80000000, 1, 0xa0000000, 2,
3, 0xd0000000, 0xf0000000, 0xe0000000
};
unsigned int bar[] __attribute__ ((aligned(16))) =
{
4, 0xb0000000, 5, 0xc0000000,
0xd0000000, 6, 7, 8
};
unsigned int val[] =
{
0x80000000, 0xb0000000, 0xa0000000, 0xc0000000,
0xd0000000, 0xd0000000, 0xf0000000, 0xe0000000
};
extern void abort ();
void
xxxx ()
{
int i;
for (i = 0; i < 8; i++)
foo[i] = foo[i] < bar [i] ? bar [i] : foo[i];
}
int
main ()
{
int i;
xxxx ();
for (i = 0; i < 8; i++)
if (val[i] != foo[i])
abort ();
return 0;
}
[...@gnu-6 tmp]$ gcc /tmp/y.c -O2 -ftree-vectorize
[...@gnu-6 tmp]$ ./a.out
Aborted (core dumped)
[...@gnu-6 tmp]$
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet| |x86
Summary|g++ "-O -ftree-vectorize" |Vectorizer produces
|produces incorrect results |incorrect results on max of
|for less-than operator |signed intergers
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42542
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