| /* { dg-do compile } */ |
| /* { dg-options "-O2 -fdump-tree-thread1-details -fdump-tree-thread4" } */ |
| |
| extern int status, pt; |
| extern int count; |
| void |
| foo (int N, int c, int b, int *a) |
| { |
| int i, flag; |
| i = b -1; |
| flag = 1; |
| if (status && i < N && a[i] == b) { |
| N--; |
| flag = 0; |
| if (pt) |
| count++; |
| } |
| else |
| for (i = -1, flag = 1; ++i < N && flag;) |
| if (a[i] == b) |
| { |
| --N; |
| flag = 0; |
| if (i < N) |
| a[i] = a[N]; |
| else |
| a[i] = 0; |
| if (pt) |
| count++; |
| } |
| if(status && flag) |
| pt--; |
| } |
| |
| /* There are 2 jump threading opportunities (which don't cross loops), |
| all of which will be realized, which will eliminate testing of |
| FLAG, completely. */ |
| /* { dg-final { scan-tree-dump-times "Registering jump" 2 "thread1"} } */ |
| |
| /* We used to remove references to FLAG by DCE2, but this was |
| depending on early threaders threading through loop boundaries |
| (which we shouldn't do). However, the late threading passes, which |
| run after loop optimizations , can successfully eliminate the |
| references to FLAG. Verify that ther are no references by the late |
| threading passes. */ |
| /* { dg-final { scan-tree-dump-not "if .flag" "thread4"} } */ |
