[PATCH] D52286: [Intrinsic] Signed Saturation Intirnsic

[Leonard Chan via Phabricator via llvm-commits]

leonardchan created this revision.
leonardchan added a reviewer: ebevhan.
Herald added a subscriber: mgorny.

Add a new intrinsic that saturates a signed integer. If a value X provided is larger than the maximum value that can be represented by the provided bit width W, the this intrinsic returns that maximum value. If the X is smaller than the minimum value that can be represented in W bits, the intrinsic returns that minimum value. Otherwise, X is returned.

This is a part of implementing fixed point arithmetic in clang where some of the more complex operations will be implemented as intrinsics.


Repository:
  rL LLVM

https://reviews.llvm.org/D52286

Files:
  include/llvm/CodeGen/ISDOpcodes.h
  include/llvm/IR/Intrinsics.td
  lib/CodeGen/IntrinsicLowering.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  lib/Transforms/CMakeLists.txt
  lib/Transforms/FixedPoint/CMakeLists.txt
  lib/Transforms/FixedPoint/SaturationPass.cpp
  test/Transforms/FixedPoint/saturation.ll

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