[RISCV] Implement isZextFree

This returns true for 8-bit and 16-bit loads, allowing LBU/LHU to be selected
and avoiding unnecessary masks.

llvm-svn: 330943
3 files changed
tree: 8f583b8c1ac66b8b2fa6966366b02f4f472c8654
  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. README.md
README.md

Low Level Virtual Machine (LLVM)

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