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fuchsia/third_party/llvm-project/55cc7eb5cbfc3cb5faa0e288ebc6aefdb916dccb
commit
55cc7eb5cbfc3cb5faa0e288ebc6aefdb916dccb
[log]
author
Craig Topper <craig.topper@intel.com>
Wed Feb 20 21:35:05 2019 +0000
committer
Craig Topper <craig.topper@intel.com>
Wed Feb 20 21:35:05 2019 +0000
tree
5a483ed7331fd3a2e6cc3eab0ee9b45e9f9fed20
parent
198cc305e985accb3ba74f64e38fd5b3146fe6f4 [diff]
[X86] Add test cases to show missed opportunities to remove AND mask from BTC/BTS/BTR instructions when LHS of AND has known zeros.

We can currently remove the mask if the immediate has all ones in the LSBs, but if the LHS of the AND is known zero, then the immediate might have had bits removed.

A similar issue also occurs with shifts and rotates. I'm preparing a common fix for all of them.

llvm-svn: 354520
1 file changed
tree: 5a483ed7331fd3a2e6cc3eab0ee9b45e9f9fed20
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. pstl/
  17. .arcconfig
  18. .clang-format
  19. .clang-tidy
  20. README.md
README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.