[PATCH] D18291: Add IntrOnlyWrite intrinsic property

[Nicolai Hähnle via llvm-commits]

nhaehnle created this revision.
nhaehnle added reviewers: tstellarAMD, arsenm.
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Herald added a subscriber: arsenm.

This property is used to mark an intrinsic that writes to memory, but is
lowered to instructions without the mayLoad or hasSideEffects flag because the
target-specific code understands its memory behavior fully.

An example for this is the llvm.amdgcn.buffer.store.format.* intrinsic, which
corresponds to a store instruction that goes through a special buffer
descriptor rather than through a plain pointer.

With this property, the intrinsic should still be handled as having side
effects at the LLVM IR level, but machine scheduling can make smarter
decisions.

http://reviews.llvm.org/D18291

Files:
  include/llvm/IR/Intrinsics.td
  include/llvm/IR/IntrinsicsAMDGPU.td
  lib/Target/AMDGPU/SIInstructions.td
  utils/TableGen/CodeGenDAGPatterns.cpp
  utils/TableGen/CodeGenIntrinsics.h
  utils/TableGen/CodeGenTarget.cpp

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