| /* { dg-do compile } */ |
| /* { dg-options "-O -Wmaybe-uninitialized -fdump-tree-uninit1" } */ |
| |
| extern unsigned bar (void); |
| extern void quux (void); |
| int z; |
| unsigned foo (unsigned v, int y, int w) |
| { |
| unsigned u; |
| if (v != 1) |
| u = bar (); |
| |
| // Prevent the "dom" pass from changing the CFG layout based on the inference |
| // 'if (v != 1) is false then (v != 2) is true'. (Now it would have to |
| // duplicate the loop in order to do so, which is deemed expensive.) |
| for (int i = 0; i < 10; i++) |
| quux (); |
| |
| // This variantion from uninit-pred-11.c caused compute_control_dep_chain |
| // to run into a defect, producing z != 0 && v != 1, omitting !(i<10) |
| // from the path predicate |
| if (w) |
| { |
| if (y) |
| z = 1; |
| if (v != 1) |
| return u; /* { dg-bogus "may be used uninitialized" } */ |
| } |
| |
| return 0; |
| } |
| |
| /* Make sure predicate analysis picked up the loop exit condition. */ |
| /* { dg-final { scan-tree-dump "AND \\(NOT \\((ivtmp|doloop)" "uninit1" } } */ |
