Allow matching extend-from-memory with strict FP nodes

This implements a small enhancement to https://reviews.llvm.org/D55506

Specifically, while we were able to match strict FP nodes for
floating-point extend operations with a register as source, this
did not work for operations with memory as source.

That is because from regular operations, this is represented as
a combined "extload" node (which is a variant of a load SD node);
but there is no equivalent using a strict FP operation.

However, it turns out that even in the absence of an extload
node, we can still just match the operations explicitly, e.g.
   (strict_fpextend (f32 (load node:$ptr))

This patch implements that method to match the LDEB/LXEB/LXDB
SystemZ instructions even when the extend uses a strict-FP node.

llvm-svn: 364450
6 files changed
tree: fac06f3e4eb8ee5d8c60ed634d66888a79da325a
  1. .arcconfig
  2. .clang-format
  3. .clang-tidy
  4. .github/
  5. .gitignore
  6. README.md
  7. clang-tools-extra/
  8. clang/
  9. compiler-rt/
  10. debuginfo-tests/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llgo/
  18. llvm/
  19. openmp/
  20. parallel-libs/
  21. polly/
  22. pstl/
README.md

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