https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97138
Bug ID: 97138
Summary: cross-BB vectorization opportunity
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
double a[1024], b[1024];
void bar();
void foo(double x)
{
double a0 = a[0];
double a1 = a[1];
for (int i = 0; i < 511;)
{
b[2*i] = a0 + x;
b[2*i + 1] = a1 + x;
i++;
bar ();
a0 = a[2*i];
a1 = a[2*i+1];
}
}
can be BB vectorized but that needs handling of PHI nodes and multiple BBs
for an optimal result.
