[PATCH] D11739: Add new llvm.loop.unroll.enable metadata

[Mark Heffernan]

meheff created this revision.
meheff added reviewers: TylerNowicki, hfinkel.
meheff added subscribers: cfe-commits, llvm-commits.

This change adds the unroll metadata "llvm.loop.unroll.enable" which directs
the optimizer to unroll a loop fully if the trip count is known at compile time, and
unroll partially if the trip count is not known at compile time. This differs from
"llvm.loop.unroll.full" which explicitly does not unroll a loop if the trip count is not
known at compile time.

Corresponding clang patch which maps "#pragma unroll" to the new
"llvm.loop.unroll.enable" metadata: http://reviews.llvm.org/D11738

http://reviews.llvm.org/D11739

Files:
  docs/LangRef.rst
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  test/Transforms/LoopUnroll/unroll-pragmas.ll

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