[PATCH] D89953: [AArch64] Implement getIntrinsicInstrCost, handle min/max intrinsics.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: dmgreen, aemerson, jpaquette, samparker.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
Herald added a reviewer: paquette.
Herald added a project: LLVM.
fhahn requested review of this revision.

This patch adds a specialized implementation of getIntrinsicInstrCost
and add initial cost-modeling for min/max vector intrinsics.

AArch64 NEON support umin/smin/umax/smax for vectors
<8 x i8>, <16 x i8>, <4 x i16>, <8 x i16>, <2 x i32> and <4 x i32>.
Notably, it does not support vectors with i64 elements.

This change by itself should have very little impact on codegen, but in
follow-up patches I plan to teach the vectorizers to consider using
those intrinsics on platforms where it is profitable, e.g. because there
is no general 'select'-like instruction.

The current cost returned should be better for throughput, latency and size.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89953

Files:
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
  llvm/test/Analysis/CostModel/AArch64/min-max.ll

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