forked from OSchip/llvm-project
53c8d95c85
Summary: Currently, loop deletion deletes loop where the only values that are used outside the loop are loop-invariant. This patch adds logic to delete loops where the loop is proven to be never executed (i.e. the only predecessor of the loop preheader has a constant conditional branch as terminator, and the preheader is not the taken target). This will remove loops that become dead after loop-unswitching generates constant conditional branches. The next steps are: 1. moving the loop deletion implementation to LoopUtils. 2. Add logic in loop-simplifyCFG which will support changing conditional constant branches to unconditional branches. If loops become unreachable in this process, they can be removed using `deleteDeadLoop` function. Reviewers: chandlerc, efriedma, sanjoy, reames Reviewed by: sanjoy Subscribers: mzolotukhin, llvm-commits Differential Revision: https://reviews.llvm.org/D32494 llvm-svn: 302015 |
||
|---|---|---|
| .. | ||
| Analysis | ||
| Assembler | ||
| Bindings | ||
| Bitcode | ||
| BugPoint | ||
| CodeGen | ||
| DebugInfo | ||
| Examples | ||
| ExecutionEngine | ||
| Feature | ||
| FileCheck | ||
| Instrumentation | ||
| Integer | ||
| JitListener | ||
| LTO | ||
| LibDriver | ||
| Linker | ||
| MC | ||
| Object | ||
| ObjectYAML | ||
| Other | ||
| SymbolRewriter | ||
| TableGen | ||
| ThinLTO/X86 | ||
| Transforms | ||
| Unit | ||
| Verifier | ||
| YAMLParser | ||
| tools | ||
| .clang-format | ||
| CMakeLists.txt | ||
| TestRunner.sh | ||
| lit.cfg | ||
| lit.site.cfg.in | ||