[Bug tree-optimization/36034] [4.3/4.4 Regression] wrong code vectorizing unrolled loop
rguenth at gcc dot gnu dot org
gcc-bugzilla@gcc.gnu.org
Thu Apr 24 11:45:00 GMT 2008
------- Comment #3 from rguenth at gcc dot gnu dot org 2008-04-24 11:44 -------
Testcase with 1d arrays (like produced by fortran):
double x[50] = { 10, 11, 12, 13, 14, 15, -1, -1, -1, -1,
21, 22, 23, 24, 25, 26, -1, -1, -1, -1,
32, 33, 34, 35, 36, 37, -1, -1, -1, -1,
43, 44, 45, 46, 47, 48, -1, -1, -1, -1,
54, 55, 56, 57, 58, 59, -1, -1, -1, -1 };
double tmp[30];
void __attribute__((noinline))
test (void)
{
int i, j;
for (i = 0; i < 5; ++i)
{
tmp[i*6] = x[i*10];
tmp[i*6+1] = x[i*10+1];
tmp[i*6+2] = x[i*10+2];
tmp[i*6+3] = x[i*10+3];
tmp[i*6+4] = x[i*10+4];
tmp[i*6+5] = x[i*10+5];
}
}
extern void abort (void);
int main()
{
int i, j;
test();
for (i = 0; i < 5; ++i)
for (j = 0; j < 6; ++j)
if (tmp[i*6+j] == -1)
abort ();
return 0;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36034
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