| Summary: | ``(1 >> X) != 0` pattern should be extended to support other constants | ||
|---|---|---|---|
| Product: | gcc | Reporter: | Andrew Pinski <pinskia> |
| Component: | tree-optimization | Assignee: | Andrew Pinski <pinskia> |
| Status: | ASSIGNED --- | ||
| Severity: | enhancement | CC: | gabravier |
| Priority: | P3 | Keywords: | missed-optimization |
| Version: | 14.0 | ||
| Target Milestone: | --- | ||
| See Also: | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105832 | ||
| Host: | Target: | ||
| Build: | Known to work: | ||
| Known to fail: | Last reconfirmed: | 2023-10-25 00:00:00 | |
We could extend it to support power of 2 constants or more. Example: ``` int f(int a) { return 2 != (2 >> a); } ``` This could be optimized to `a != 0`