forked from OSchip/llvm-project
fe79061be2
Add a flag to getPredicateAt() that allows making use of the block value. This allows us to take into account range information from the current block, rather than only information that is threaded over edges, making the icmp simplification in CVP a lot more powerful. I'm not changing getPredicateAt() to use the block value unconditionally to avoid any impact on the JumpThreading pass, which is somewhat picky about LVI query order. Most test changes here are just icmps that now get dropped (while previously only a result used in a return was replaced). The three tests in icmp.ll show some representative improvements. Some of the folds this enables have been covered by IPSCCP in the meantime, but LVI can reason about some cases which are hard to support in IPSCCP, such as in test_br_cmp_with_offset. The compile-time time cost of doing this is fairly minimal, with a ~0.05% CTMark regression for ReleaseThinLTO: https://llvm-compile-time-tracker.com/compare.php?from=709d03f8af4da4204849a70f01798e7cebba2e32&to=6236fd503761f43c99f4537121e057a01056f185&stat=instructions This is because the block values will typically already be queried and cached by other CVP optimizations anyway. Differential Revision: https://reviews.llvm.org/D69686 |
||
|---|---|---|
| .. | ||
| Analysis | ||
| Assembler | ||
| Bindings | ||
| Bitcode | ||
| BugPoint | ||
| CodeGen | ||
| DebugInfo | ||
| Demangle | ||
| Examples | ||
| ExecutionEngine | ||
| Feature | ||
| FileCheck | ||
| Instrumentation | ||
| Integer | ||
| JitListener | ||
| LTO | ||
| Linker | ||
| MC | ||
| MachineVerifier | ||
| Object | ||
| ObjectYAML | ||
| Other | ||
| Reduce | ||
| SafepointIRVerifier | ||
| Support | ||
| SymbolRewriter | ||
| TableGen | ||
| ThinLTO/X86 | ||
| Transforms | ||
| Unit | ||
| Verifier | ||
| YAMLParser | ||
| tools | ||
| .clang-format | ||
| CMakeLists.txt | ||
| TestRunner.sh | ||
| lit.cfg.py | ||
| lit.site.cfg.py.in | ||