| /* { dg-do compile } */ |
| /* { dg-options "-O2 -fdump-tree-fre1" } */ |
| |
| float bar, baz; |
| void foo (int *p, int n) |
| { |
| *p = 0; |
| do |
| { |
| bar = 1.; |
| /* When iterating we should have optimistically value-numbered |
| *p to zero, on the second iteration we have to prove the |
| store below does not affect the value of this load though. |
| We can compare the stored value against the value from the |
| previous iteration instead relying on a non-walking lookup. */ |
| if (*p) |
| { |
| baz = 2.; |
| *p = 0; |
| } |
| } |
| while (--n); |
| } |
| |
| /* { dg-final { scan-tree-dump-not "baz" "fre1" } } */ |
