https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99395
--- Comment #11 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
It seems that we should fix this case (Richard gave) first which I think it's
not the SCEV or value-numbering issue:
double a[1024];
void foo ()
{
for (int i = 0; i < 1022; i += 2)
{
double tem = a[i+1];
a[i] = tem * a[i];
a[i+1] = a[i+2] * tem;
}
}
auto.c:13:21: missed: couldn't vectorize loop
auto.c:15:14: missed: not vectorized: no vectype for stmt: tem_10 = a[_1];
scalar_type: double
