mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-26 09:06:07 +00:00
7954a0514b
Support for more precise TBAA metadata has been added a while ago (behind the -fpointer-tbaa flag). The more precise TBAA metadata allows treating accesses of different pointer types as no-alias. This helps to remove more redundant loads and stores in a number of workloads. Some highlights on the impact across llvm-test-suite's MultiSource, SPEC2006 & SPEC2017 include: * +2% more NoAlias results for memory accesses * +3% more stores removed by DSE, * +4% more loops vectorized. This closes a relatively big gap to GCC, which has been supporting disambiguating based on pointer types for a long time. (https://clang.godbolt.org/z/K7Wbhrz4q) Pointer-TBAA support for pointers to builtin types has been added in https://github.com/llvm/llvm-project/pull/76612. Support for user-defined types has been added in https://github.com/llvm/llvm-project/pull/110569. There are 2 recent PRs with bug fixes for special cases uncovered during testing: * https://github.com/llvm/llvm-project/pull/116991 * https://github.com/llvm/llvm-project/pull/116596 PR: https://github.com/llvm/llvm-project/pull/117244